{"id":"CVE-2021-28951","aliases":["AZL-6539","BELL-CVE-2021-28951","DEBIAN-CVE-2021-28951","EUVD-2021-15602","GHSA-q9qq-7xqr-6gxf","MGASA-2021-0174","MGASA-2021-0175","UBUNTU-CVE-2021-28951","USN-4948-1"],"status":"published","title":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers...","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00279,"percentile":0.20541,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-667"],"published":"2021-03-20T19:53:46Z","modified":"2026-10-23T18:03:57Z","fixes":[{"ecosystem":"Azure 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Advisory","fix","report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PTRNPQTZ4GVS46SZ4OBXY5YDOGVPSTGQ/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4VCKIOXCOZGXBEZMO5LGGV5MWCHO6FT3/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://security.netapp.com/advisory/ntap-20210430-0003/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28951","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4VCKIOXCOZGXBEZMO5LGGV5MWCHO6FT3/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTRNPQTZ4GVS46SZ4OBXY5YDOGVPSTGQ/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/"},{"url":"https://github.com/advisories/GHSA-q9qq-7xqr-6gxf"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2021-28951","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-28951","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0174.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28690","tags":["report"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28596","tags":["report"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.26","tags":["web"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.27","tags":["web"]},{"url":"https://xenbits.xen.org/xsa/advisory-371.html","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0175.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=28691","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28951","tags":["report"]},{"url":"https://git.kernel.org/linus/3ebba796fa251d042be42b929a2d916ee5c34a49","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4948-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-28951","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-25670","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-25671","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-25672","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3483","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3489","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3490","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3491","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28688","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28952","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28964","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28971","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28972","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29264","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29266","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29646","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29647","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29649","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29650","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-29657","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-31916","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-28951","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T19:53:46Z","modified":"2024-08-03T21:55:12.099Z","updated_at":"2026-11-02T14:33:09.175141Z"}],"euvd":[{"id":"EUVD-2021-15602","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T19:53:46Z","modified":"2024-08-03T21:55:12Z","updated_at":"2026-11-03T03:24:46.117926Z"}],"ghsa":[{"id":"GHSA-q9qq-7xqr-6gxf","title":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers...","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2022-05-24T17:44:58Z","modified":"2023-01-29T05:06:56Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:46:07.317218Z"}],"nvd":[{"id":"CVE-2021-28951","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T20:15:13.553Z","modified":"2026-06-17T03:47:03.973Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.9,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:06:50.805771Z"}],"osv":[{"id":"AZL-6539","title":"CVE-2021-28951 affecting package kernel for versions less than 5.10.78.1-1","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T20:15:13Z","modified":"2026-04-21T04:37:35.259598Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:08.076947Z"},{"id":"BELL-CVE-2021-28951","title":"CVE-2021-28951 does not affect BellSoft software","status":"withdrawn","published":"2021-03-20T20:15:00Z","modified":"2026-01-26T09:49:17.709646Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:15.925958Z"},{"id":"CVE-2021-28951","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T20:15:13.553Z","modified":"2026-04-16T04:43:43.794774079Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:19.129331Z"},{"id":"DEBIAN-CVE-2021-28951","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T20:15:13.553Z","modified":"2026-10-23T18:03:57.604987977Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:34.94143Z"},{"id":"UBUNTU-CVE-2021-28951","description":"An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.","status":"published","published":"2021-03-20T20:15:00Z","modified":"2026-02-04T04:04:42.132886Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"MGASA-2021-0174","title":"Updated kernel packages fix security vulnerabilities","description":"This kernel update is based on upstream 5.10.27 and fixes at least the\nfollowing security issues:\n\nThe fix for XSA-365 includes initialization of pointers such that\nsubsequent cleanup code wouldn't use uninitialized or stale values.\nThis initialization went too far and may under certain conditions also\noverwrite pointers which are in need of cleaning up. The lack of\ncleanup would result in leaking persistent grants. The leak in turn\nwould prevent fully cleaning up after a respective guest has died,\nleaving around zombie domains. A malicious or buggy frontend driver\nmay be able to cause resource leaks from the corresponding backend\ndriver. This can result in a host-wide Denial of Sevice (DoS).\n(CVE-2021-28688 / XSA-371).\n\nAn issue was discovered in fs/io_uring.c in the Linux kernel through\n5.11.8. It allows attackers to cause a denial of service (deadlock)\nbecause exit may be waiting to park a SQPOLL thread, but concurrently\nthat SQPOLL thread is waiting for a signal to start (CVE-2021-28951).\n\nA race condition was discovered in get_old_root in fs/btrfs/ctree.c in\nthe Linux kernel through 5.11.8. It allows attackers to cause a denial\nof service (BUG) because of a lack of locking on an extent buffer \nbefore a cloning operation (CVE-2021-28964).\n\nIn intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c in the Linux\nkernel through 5.11.8 on some Haswell CPUs, userspace applications (such\nas perf-fuzzer) can cause a system crash because the PEBS status in a\nPEBS record is mishandled (CVE-2021-28971).\n\nIn drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux kernel through 5.11.8,\nthe RPA PCI Hotplug driver has a user-tolerable buffer overflow when\nwriting a new device name to the driver from userspace, allowing userspace\nto write data to the kernel stack frame directly. This occurs because\nadd_slot_store and remove_slot_store mishandle drc_name '\\0' termination\n(CVE-2021-28972).\n\nAn issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/\nvdpa.c has a use-after-free because v-\u003econfig_ctx has an invalid value\nupon re-opening a character device (CVE-2021-29266).\n\nIt also adds the following fixes:\n- arm: enable OF_OVERLAY (mga#28596)\n- iomap: Fix negative assignment to unsigned sis-\u003epages in\n  iomap_swapfile_activate\n- thermal/core: Add NULL pointer check before using cooling device stats\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2021-04-03T13:16:06Z","modified":"2026-04-16T04:42:34.279828766Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"MGASA-2021-0175","title":"Updated kernel-linus packages fix security vulnerabilities","description":"This kernel-linus update is based on upstream 5.10.27 and fixes at least\nthe following security issues:\n\nThe fix for XSA-365 includes initialization of pointers such that\nsubsequent cleanup code wouldn't use uninitialized or stale values.\nThis initialization went too far and may under certain conditions also\noverwrite pointers which are in need of cleaning up. The lack of\ncleanup would result in leaking persistent grants. The leak in turn\nwould prevent fully cleaning up after a respective guest has died,\nleaving around zombie domains. A malicious or buggy frontend driver\nmay be able to cause resource leaks from the corresponding backend\ndriver. This can result in a host-wide Denial of Sevice (DoS).\n(CVE-2021-28688 / XSA-371).\n\nAn issue was discovered in fs/io_uring.c in the Linux kernel through\n5.11.8. It allows attackers to cause a denial of service (deadlock)\nbecause exit may be waiting to park a SQPOLL thread, but concurrently\nthat SQPOLL thread is waiting for a signal to start (CVE-2021-28951).\n\nA race condition was discovered in get_old_root in fs/btrfs/ctree.c in\nthe Linux kernel through 5.11.8. It allows attackers to cause a denial\nof service (BUG) because of a lack of locking on an extent buffer \nbefore a cloning operation (CVE-2021-28964).\n\nIn intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c in the Linux\nkernel through 5.11.8 on some Haswell CPUs, userspace applications (such\nas perf-fuzzer) can cause a system crash because the PEBS status in a\nPEBS record is mishandled (CVE-2021-28971).\n\nIn drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux kernel through 5.11.8,\nthe RPA PCI Hotplug driver has a user-tolerable buffer overflow when\nwriting a new device name to the driver from userspace, allowing userspace\nto write data to the kernel stack frame directly. This occurs because\nadd_slot_store and remove_slot_store mishandle drc_name '\\0' termination\n(CVE-2021-28972).\n\nAn issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/\nvdpa.c has a use-after-free because v-\u003econfig_ctx has an invalid value\nupon re-opening a character device (CVE-2021-29266).\n\nIt also adds the following fixes:\n- arm: enable OF_OVERLAY (mga#28596)\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2021-04-03T13:16:06Z","modified":"2026-04-16T04:41:45.656024923Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"USN-4948-1","title":"linux-oem-5.10 vulnerabilities","description":"Ryota Shiga discovered that the eBPF implementation in the Linux kernel did\nnot properly verify that a BPF program only reserved as much memory for a\nring buffer as was allocated. A local attacker could use this to cause a\ndenial of service (system crash) or execute arbitrary code. (CVE-2021-3489)\n\nManfred Paul discovered that the eBPF implementation in the Linux kernel\ndid not properly track bounds on bitwise operations. A local attacker could\nuse this to cause a denial of service (system crash) or execute arbitrary\ncode. (CVE-2021-3490)\n\nBilly Jheng Bing-Jhong discovered that the io_uring implementation of the\nLinux kernel did not properly enforce the MAX_RW_COUNT limit in some\nsituations. A local attacker could use this to cause a denial of service\n(system crash) or execute arbitrary code. (CVE-2021-3491)\n\nKiyin (尹亮) discovered that the NFC LLCP protocol implementation in the\nLinux kernel contained a reference counting error. A local attacker could\nuse this to cause a denial of service (system crash). (CVE-2020-25670)\n\nKiyin (尹亮) discovered that the NFC LLCP protocol implementation in the\nLinux kernel did not properly deallocate memory in certain error\nsituations. A local attacker could use this to cause a denial of service\n(memory exhaustion). (CVE-2020-25671, CVE-2020-25672)\n\nIt was discovered that the Xen paravirtualization backend in the Linux\nkernel did not properly deallocate memory in some situations. A local\nattacker could use this to cause a denial of service (memory exhaustion).\n(CVE-2021-28688)\n\nIt was discovered that the io_uring subsystem in the Linux kernel contained\na race condition leading to a deadlock condition. A local attacker could\nuse this to cause a denial of service. (CVE-2021-28951)\n\nJohn Stultz discovered that the audio driver for Qualcomm SDM845 systems in\nthe Linux kernel did not properly validate port ID numbers. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2021-28952)\n\nZygo Blaxell discovered that the btrfs file system implementation in the\nLinux kernel contained a race condition during certain cloning operations.\nA local attacker could possibly use this to cause a denial of service\n(system crash). (CVE-2021-28964)\n\nVince Weaver discovered that the perf subsystem in the Linux kernel did\nnot properly handle certain PEBS records properly for some Intel Haswell\nprocessors. A local attacker could use this to cause a denial of service\n(system crash). (CVE-2021-28971)\n\nIt was discovered that the RPA PCI Hotplug driver implementation in the\nLinux kernel did not properly handle device name writes via sysfs, leading\nto a buffer overflow. A privileged attacker could use this to cause a\ndenial of service (system crash) or possibly execute arbitrary code.\n(CVE-2021-28972)\n\nIt was discovered that the Freescale Gianfar Ethernet driver for the Linux\nkernel did not properly handle receive queue overrun when jumbo frames were\nenabled in some situations. An attacker could use this to cause a denial of\nservice (system crash). (CVE-2021-29264)\n\nIt was discovered that the vDPA backend virtio driver in the Linux kernel\ncontained a use-after-free vulnerability. An attacker could use this to\ncause a denial of service (system crash) or possibly execute arbitrary\ncode. (CVE-2021-29266)\n\nIt was discovered that the TIPC protocol implementation in the Linux kernel\ndid not properly validate passed encryption key sizes. A local attacker\ncould use this to cause a denial of service (system crash).\n(CVE-2021-29646)\n\nIt was discovered that the Qualcomm IPC router implementation in the Linux\nkernel did not properly initialize memory passed to user space. A local\nattacker could use this to expose sensitive information (kernel memory).\n(CVE-2021-29647)\n\nIt was discovered that the BPF user mode driver implementation in the Linux\nkernel did not properly deallocate memory in some situations. A local\nattacker could use this to cause a denial of service (memory exhaustion).\n(CVE-2021-29649)\n\nIt was discovered that a race condition existed in the netfilter subsystem\nof the Linux kernel when replacing tables. A local attacker could use this\nto cause a denial of service (system crash). (CVE-2021-29650)\n\nFelix Wilhelm discovered that the KVM implementation in the Linux kernel\nfor AMD processors contained race conditions on nested VMCB controls. A\nlocal attacker in a guest vm could possibly use this to gain elevated\nprivileges. (CVE-2021-29657)\n\nDan Carpenter discovered that the block device manager (dm) implementation\nin the Linux kernel contained a buffer overflow in the ioctl for listing\ndevices. A privileged local attacker could use this to cause a denial of\nservice (system crash). (CVE-2021-31916)\n\n马哲宇 discovered that the IEEE 1394 (Firewire) nosy packet sniffer\ndriver in the Linux kernel did not properly perform reference counting in\nsome situations, leading to a use-after-free vulnerability. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2021-3483)\n","status":"published","published":"2021-05-11T22:31:50Z","modified":"2026-06-03T14:03:42.334918913Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}