{"id":"CVE-2021-20194","aliases":["ALSA-2021:4356","AZL-34857","AZL-6529","DEBIAN-CVE-2021-20194","EUVD-2021-7641","GHSA-vw35-vgjr-5jhv","MGASA-2021-0099","MGASA-2021-0100","RHSA-2021:4140","RHSA-2021:4356","UBUNTU-CVE-2021-20194","USN-4879-1","USN-4884-1","USN-4909-1","USN-4912-1"],"status":"published","title":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with...","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.004,"percentile":0.34557,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20","CWE-787"],"published":"2021-02-23T22:33:24Z","modified":"2026-11-11T09:36:56Z","fixes":[{"ecosystem":"Azure Linux:3","package":"kernel","fixed_in":["6.6.35.1-4"],"sources":["osv"]},{"ecosystem":"Azure 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is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T22:33:24Z","modified":"2024-08-03T17:30:07.585Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-7641","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T22:33:24Z","modified":"2024-08-03T17:30:07Z","updated_at":"2026-11-03T03:25:09.355483Z"}],"ghsa":[{"id":"GHSA-vw35-vgjr-5jhv","title":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with...","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2022-05-24T17:42:57Z","modified":"2023-02-10T05:07:23Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-20","CWE-787"],"updated_at":"2026-11-02T14:54:03.896291Z"}],"nvd":[{"id":"CVE-2021-20194","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T23:15:13.1Z","modified":"2026-06-17T03:33:27.007Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20","CWE-787"],"updated_at":"2026-11-02T14:06:50.031227Z"}],"osv":[{"id":"AZL-34857","title":"CVE-2021-20194 affecting package kernel for versions less than 6.6.35.1-4","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T23:15:13Z","modified":"2026-11-05T05:40:51Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-05T16:41:19.380321Z"},{"id":"AZL-6529","title":"CVE-2021-20194 affecting package kernel for versions less than 5.15.26.1-1","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T23:15:13Z","modified":"2026-04-21T04:37:33.891233Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"CVE-2021-20194","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T23:15:13.1Z","modified":"2026-04-16T04:39:16.648912405Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:17.663289Z"},{"id":"DEBIAN-CVE-2021-20194","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T23:15:13.1Z","modified":"2026-10-23T18:03:24.205009493Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.311861Z"},{"id":"RHSA-2021:4140","title":"Red Hat Security Advisory: kernel-rt security and bug fix update","status":"published","published":"2024-09-13T23:13:13Z","modified":"2026-08-14T10:01:48Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"RHSA-2021:4356","title":"Red Hat Security Advisory: kernel security, bug fix, and enhancement update","status":"published","published":"2024-09-16T05:32:57Z","modified":"2026-10-02T10:01:28Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:08.619234Z"},{"id":"UBUNTU-CVE-2021-20194","description":"There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.","status":"published","published":"2021-02-23T23:15:00Z","modified":"2026-11-11T09:36:56.720468825Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-11T09:58:34.835181Z"},{"id":"ALSA-2021:4356","title":"Moderate: kernel security, bug fix, and enhancement update","description":"The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n* kernel: out-of-bounds reads in pinctrl subsystem (CVE-2020-0427)\n* kernel: Improper input validation in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24502)\n* kernel: Insufficient access control in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24503)\n* kernel: Uncontrolled resource consumption in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24504)\n* kernel: Fragmentation cache not cleared on reconnection (CVE-2020-24586)\n* kernel: Reassembling fragments encrypted under different keys (CVE-2020-24587)\n* kernel: wifi frame payload being parsed incorrectly as an L2 frame (CVE-2020-24588)\n* kernel: Forwarding EAPOL from unauthenticated wifi client (CVE-2020-26139)\n* kernel: accepting plaintext data frames in protected networks (CVE-2020-26140)\n* kernel: not verifying TKIP MIC of fragmented frames (CVE-2020-26141)\n* kernel: accepting fragmented plaintext frames in protected networks (CVE-2020-26143)\n* kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header (CVE-2020-26144)\n* kernel: accepting plaintext broadcast fragments as full frames (CVE-2020-26145)\n* kernel: powerpc: RTAS calls can be used to compromise kernel integrity (CVE-2020-27777)\n* kernel: locking inconsistency in tty_io.c and tty_jobctrl.c can lead to a read-after-free (CVE-2020-29660)\n* kernel: buffer overflow in mwifiex_cmd_802_11_ad_hoc_start function via a long SSID value (CVE-2020-36158)\n* kernel: slab out-of-bounds read in hci_extended_inquiry_result_evt()  (CVE-2020-36386)\n* kernel: Improper access control in BlueZ may allow information disclosure vulnerability. (CVE-2021-0129)\n* kernel: Use-after-free in ndb_queue_rq() in drivers/block/nbd.c (CVE-2021-3348)\n* kernel: Linux kernel eBPF RINGBUF map oversized allocation (CVE-2021-3489)\n* kernel: double free in bluetooth subsystem when the HCI device initialization fails (CVE-2021-3564)\n* kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573)\n* kernel: eBPF 32-bit source register truncation on div/mod (CVE-2021-3600)\n* kernel: DoS in rb_per_cpu_empty() (CVE-2021-3679)\n* kernel: Mounting overlayfs inside an unprivileged user namespace can reveal files (CVE-2021-3732)\n* kernel: heap overflow in __cgroup_bpf_run_filter_getsockopt() (CVE-2021-20194)\n* kernel: Race condition in sctp_destroy_sock list_del (CVE-2021-23133)\n* kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode (CVE-2021-28950)\n* kernel: System crash in intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c (CVE-2021-28971)\n* kernel: protection can be bypassed to leak content of kernel memory (CVE-2021-29155)\n* kernel: improper input validation in tipc_nl_retrieve_key function in net/tipc/node.c (CVE-2021-29646)\n* kernel: lack a full memory barrier may lead to DoS (CVE-2021-29650)\n* kernel: local escalation of privileges in handling of eBPF programs (CVE-2021-31440)\n* kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel memory (CVE-2021-31829)\n* kernel: out-of-bounds reads and writes due to enforcing incorrect limits for pointer arithmetic operations by BPF verifier (CVE-2021-33200)\n* kernel: reassembling encrypted fragments with non-consecutive packet numbers (CVE-2020-26146)\n* kernel: reassembling mixed encrypted/plaintext fragments (CVE-2020-26147)\n* kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check (CVE-2020-29368)\n* kernel: flowtable list del corruption with kernel BUG at lib/list_debug.c:50 (CVE-2021-3635)\n* kernel: NULL pointer dereference in llsec_key_alloc() in net/mac802154/llsec.c (CVE-2021-3659)\n* kernel: setsockopt System Call Untrusted Pointer Dereference Information Disclosure (CVE-2021-20239)\n* kernel: out of bounds array access in drivers/md/dm-ioctl.c (CVE-2021-31916)","status":"published","published":"2021-11-09T09:08:02Z","modified":"2026-10-29T11:12:08.703144131Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"MGASA-2021-0099","title":"Updated kernel packages fix security vulnerabilities","description":"This kernel update is based on upstream 5.10.19 and fixes at least the\nfollowing security issues:\n\nThere is a vulnerability in the linux kernel versions higher than 5.2 (if\nkernel compiled with config params CONFIG_BPF_SYSCALL=y, CONFIG_BPF=y,\nCONFIG_CGROUPS=y, CONFIG_CGROUP_BPF=y, CONFIG_HARDENED_USERCOPY not set,\nand BPF hook to getsockopt is registered). As result of BPF execution,\nthe local user can trigger bug in __cgroup_bpf_run_filter_getsockopt()\nfunction that can lead to heap overflow (because of non-hardened\nusercopy). The impact of attack could be deny of service or possibly\nprivileges escalation. NOTE! Mageia kernel configs have HARDENED_USERCOPY\nenabled by default, making this an non-issue when using prebuilt kernels\n(CVE-2021-20194).\n\nAn information disclosure vulnerability exists in the ARM SIGPAGE\nfunctionality of Linux Kernel. A userland application can read the\ncontents of the sigpage, which can leak kernel memory contents. An\nattacker can read a process’s memory at a specific offset to trigger\nthis vulnerability (CVE-2021-21781).\n\nAn issue was discovered in the Linux kernel 3.11 through 5.10.16, as used\nby Xen. To service requests to the PV backend, the driver maps grant\nreferences provided by the frontend. In this process, errors may be\nencountered. In one case, an error encountered earlier might be\ndiscarded by later processing, resulting in the caller assuming\nsuccessful mapping, and hence subsequent operations trying to access\nspace that wasn't mapped. In another case, internal state would be\ninsufficiently updated, preventing safe recovery from the error\n(CVE-2021-26930).\n\nAn issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as\nused in Xen. Block, net, and SCSI backends consider certain errors a\nplain bug, deliberately causing a kernel crash. For errors potentially\nbeing at least under the influence of guests (such as out of memory\nconditions), it isn't correct to assume a plain bug. Memory allocations\npotentially causing such crashes occur only when Linux is running in\nPV mode, though (CVE-2021-26931).\n\nAn issue was discovered in the Linux kernel 3.2 through 5.10.16, as used\nby Xen. Grant mapping operations often occur in batch hypercalls, where\na number of operations are done in a single hypercall, the success or\nfailure of each one is reported to the backend driver, and the backend\ndriver then loops over the results, performing follow-up actions based\non the success or failure of each operation. Unfortunately, when running\nin PV mode, the Linux backend drivers mishandle this: Some errors are\nignored, effectively implying their success from the success of related\nbatch elements. In other cases, errors resulting from one batch element\nlead to further batch elements not being inspected, and hence successful\nones to not be possible to properly unmap upon error recovery. Only\nsystems with Linux backends running in PV mode are vulnerable. Linux\nbackends run in HVM / PVH modes are not vulnerable (CVE-2021-26932).\n\nIt also adds the following fixes:\n- enable ACPI_EC_DEBUGFS (mga#28415)\n- ALSA: hda: Add another CometLake-H PCI ID\n- Revert 'drm/amd/display: Update NV1x SR latency values'\n- drm/nouveau/kms: handle mDP connectors\n- drm/i915/gt: One more flush for Baytrail clear residuals\n- drm/i915/gt: Flush before changing register state\n- drm/i915/gt: Correct surface base address for renderclear\n- rtw88: 8821c: add RFE type 2 support\n- update rtw89 patchset to v3\n- tracing: Check length before giving out the filter buffer\n- drop \"revert 'Bluetooth: btusb: Add Qualcomm Bluetooth SoC WCN6855\n  support' (mga#27910)\"\n- Bluetooth: btusb: fix for Qualcomm Bluetooth adapters that stopped working\n  due to not finding (unneeded) ROME firmware (real fix for mga#27910)\n- media: uvcvideo: Allow entities with no pads\n- mm/vmscan: restore zone_reclaim_mode ABI\n- nvme: Add quirks for Lexar 256GB SSD (pterjan, mga#28417)\n- nvme: add 48-bit DMA address quirk for Amazon NVMe controllers\n- nvme-pci: add the DISABLE_WRITE_ZEROES quirk for a SPCC device\n- staging/rtl8723bs: sync with 5.12-rc1 (mga#28429)\n- x86: fix seq_file iteration for pat/memtype.c\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2021-03-04T12:26:19Z","modified":"2026-04-16T04:44:29.95694987Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"MGASA-2021-0100","title":"Updated kernel-linus packages fix security vulnerabilities","description":"This kernel-linus update is based on upstream 5.10.19 and fixes at least\nthe following security issues:\n\nThere is a vulnerability in the linux kernel versions higher than 5.2 (if\nkernel compiled with config params CONFIG_BPF_SYSCALL=y, CONFIG_BPF=y,\nCONFIG_CGROUPS=y, CONFIG_CGROUP_BPF=y, CONFIG_HARDENED_USERCOPY not set,\nand BPF hook to getsockopt is registered). As result of BPF execution,\nthe local user can trigger bug in __cgroup_bpf_run_filter_getsockopt()\nfunction that can lead to heap overflow (because of non-hardened\nusercopy). The impact of attack could be deny of service or possibly\nprivileges escalation. NOTE! Mageia kernel configs have HARDENED_USERCOPY\nenabled by default, making this an non-issue when using prebuilt kernels\n(CVE-2021-20194).\n\nAn information disclosure vulnerability exists in the ARM SIGPAGE\nfunctionality of Linux Kernel. A userland application can read the\ncontents of the sigpage, which can leak kernel memory contents. An\nattacker can read a process’s memory at a specific offset to trigger\nthis vulnerability (CVE-2021-21781).\n\nAn issue was discovered in the Linux kernel 3.11 through 5.10.16, as used\nby Xen. To service requests to the PV backend, the driver maps grant\nreferences provided by the frontend. In this process, errors may be\nencountered. In one case, an error encountered earlier might be\ndiscarded by later processing, resulting in the caller assuming\nsuccessful mapping, and hence subsequent operations trying to access\nspace that wasn't mapped. In another case, internal state would be\ninsufficiently updated, preventing safe recovery from the error\n(CVE-2021-26930).\n\nAn issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as\nused in Xen. Block, net, and SCSI backends consider certain errors a\nplain bug, deliberately causing a kernel crash. For errors potentially\nbeing at least under the influence of guests (such as out of memory\nconditions), it isn't correct to assume a plain bug. Memory allocations\npotentially causing such crashes occur only when Linux is running in\nPV mode, though (CVE-2021-26931).\n\nAn issue was discovered in the Linux kernel 3.2 through 5.10.16, as used\nby Xen. Grant mapping operations often occur in batch hypercalls, where\na number of operations are done in a single hypercall, the success or\nfailure of each one is reported to the backend driver, and the backend\ndriver then loops over the results, performing follow-up actions based\non the success or failure of each operation. Unfortunately, when running\nin PV mode, the Linux backend drivers mishandle this: Some errors are\nignored, effectively implying their success from the success of related\nbatch elements. In other cases, errors resulting from one batch element\nlead to further batch elements not being inspected, and hence successful\nones to not be possible to properly unmap upon error recovery. Only\nsystems with Linux backends running in PV mode are vulnerable. Linux\nbackends run in HVM / PVH modes are not vulnerable (CVE-2021-26932).\n\nIt also adds the following fixes:\n- enable ACPI_EC_DEBUGFS (mga#28415)\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2021-03-04T12:26:19Z","modified":"2026-04-16T04:43:40.464213527Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"USN-4879-1","title":"linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities","description":"It was discovered that the Marvell WiFi-Ex device driver in the Linux\nkernel did not properly validate ad-hoc SSIDs. A local attacker could use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2020-36158)\n\nLoris Reiff discovered that the BPF implementation in the Linux kernel did\nnot properly validate attributes in the getsockopt BPF hook. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-20194)\n","status":"published","published":"2021-03-16T06:51:28Z","modified":"2026-06-03T13:33:51.935556022Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4884-1","title":"linux-oem-5.10 vulnerabilities","description":"Loris Reiff discovered that the BPF implementation in the Linux kernel did\nnot properly validate attributes in the getsockopt BPF hook. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-20194)\n\nIt was discovered that the priority inheritance futex implementation in the\nLinux kernel contained a race condition, leading to a use-after-free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2021-3347)\n\nIt was discovered that the network block device (nbd) driver in the Linux\nkernel contained a use-after-free vulnerability during device setup. A\nlocal attacker with access to the nbd device could use this to cause a\ndenial of service (system crash) or possibly execute arbitrary code.\n(CVE-2021-3348)\n","status":"published","published":"2021-03-20T04:51:03Z","modified":"2026-06-03T13:33:51.792333895Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4909-1","title":"linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities","description":"Loris Reiff discovered that the BPF implementation in the Linux kernel did\nnot properly validate attributes in the getsockopt BPF hook. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-20194)\n\nOlivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H. Schönherr\ndiscovered that the Xen paravirtualization backend in the Linux kernel did\nnot properly propagate errors to frontend drivers in some situations. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26930)\n\nJan Beulich discovered that multiple Xen backends in the Linux kernel did\nnot properly handle certain error conditions under paravirtualization. An\nattacker in a guest VM could possibly use this to cause a denial of service\n(host domain crash). (CVE-2021-26931)\n\nIt was discovered that the network block device (nbd) driver in the Linux\nkernel contained a use-after-free vulnerability during device setup. A\nlocal attacker with access to the nbd device could use this to cause a\ndenial of service (system crash) or possibly execute arbitrary code.\n(CVE-2021-3348)\n","status":"published","published":"2021-04-13T21:55:19Z","modified":"2026-06-03T13:33:58.253691428Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4912-1","title":"linux-oem-5.6 vulnerabilities","description":"Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux\nkernel did not properly validate computation of branch displacements in\nsome situations. A local attacker could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code. (CVE-2021-29154)\n\nIt was discovered that a race condition existed in the binder IPC\nimplementation in the Linux kernel, leading to a use-after-free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2020-0423)\n\nIt was discovered that the HID multitouch implementation within the Linux\nkernel did not properly validate input events in some situations. A\nphysically proximate attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2020-0465)\n\nIt was discovered that the eventpoll (aka epoll) implementation in the\nLinux kernel contained a logic error that could lead to a use after free\nvulnerability. A local attacker could use this to cause a denial of service\n(system crash) or possibly execute arbitrary code. (CVE-2020-0466)\n\nIt was discovered that a race condition existed in the perf subsystem of\nthe Linux kernel, leading to a use-after-free vulnerability. An attacker\nwith access to the perf subsystem could use this to cause a denial of\nservice (system crash) or possibly execute arbitrary code. (CVE-2020-14351)\n\nIt was discovered that the frame buffer implementation in the Linux kernel\ndid not properly handle some edge cases in software scrollback. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2020-14390)\n\nIt was discovered that a race condition existed in the hugetlb sysctl\nimplementation in the Linux kernel. A privileged attacker could use this to\ncause a denial of service (system crash). (CVE-2020-25285)\n\nIt was discovered that the GENEVE tunnel implementation in the Linux kernel\nwhen combined with IPSec did not properly select IP routes in some\nsituations. An attacker could use this to expose sensitive information\n(unencrypted network traffic). (CVE-2020-25645)\n\nBodong Zhao discovered a use-after-free in the Sun keyboard driver\nimplementation in the Linux kernel. A local attacker could use this to\ncause a denial of service or possibly execute arbitrary code.\n(CVE-2020-25669)\n\nShisong Qin and Bodong Zhao discovered that Speakup screen reader driver in\nthe Linux kernel did not correctly handle setting line discipline in some\nsituations. A local attacker could use this to cause a denial of service\n(system crash). (CVE-2020-27830)\n\nIt was discovered that the Marvell WiFi-Ex device driver in the Linux\nkernel did not properly validate ad-hoc SSIDs. A local attacker could use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2020-36158)\n\nLoris Reiff discovered that the BPF implementation in the Linux kernel did\nnot properly validate attributes in the getsockopt BPF hook. A local\nattacker could possibly use this to cause a denial of service (system\ncrash). (CVE-2021-20194)\n\nAdam Zabrocki discovered that the kprobes subsystem in the Linux kernel did\nnot properly detect linker padding in some situations. A privileged\nattacker could use this to cause a denial of service (system crash) or\npossibly expose sensitive information. (CVE-2021-3411)\n\n吴异 discovered that the NFS implementation in the Linux kernel did not\nproperly prevent access outside of an NFS export that is a subdirectory of\na file system. An attacker could possibly use this to bypass NFS access\nrestrictions. (CVE-2021-3178)\n","status":"published","published":"2021-04-13T21:35:44Z","modified":"2026-06-03T14:03:21.777156076Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}