{"id":"CVE-2021-26708","aliases":["ALSA-2021:1093","BELL-CVE-2021-26708","DEBIAN-CVE-2021-26708","EUVD-2021-13497","GHSA-hhxw-8c9w-q5q9","MGASA-2021-0084","MGASA-2021-0085","RHSA-2021:1081","RHSA-2021:1093","UBUNTU-CVE-2021-26708","USN-4727-1","openSUSE-SU-2024:10728-1","openSUSE-SU-2024:13704-1"],"status":"published","title":"A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race...","description":"A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.","severity":{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01602,"percentile":0.76142,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-269","CWE-667"],"published":"2021-02-05T07:41:12Z","modified":"2026-10-29T11:00:26Z","exploits":[{"source":"pocgithub","id":"jordan9001/vsock_poc","title":"jordan9001/vsock_poc","date":"2021-02-15","url":"https://github.com/jordan9001/vsock_poc"},{"source":"pocgithub","id":"azpema/CVE-2021-26708","title":"azpema/CVE-2021-26708","date":"2021-03-15","url":"https://github.com/azpema/CVE-2021-26708"},{"source":"pocgithub","id":"kungaocode/vulnerability-analysis-","title":"kungaocode/vulnerability-analysis-","date":"2026-08-07","url":"https://github.com/kungaocode/vulnerability-analysis-"}],"fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["5.10.13-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["5.10.13-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["5.10.13-1"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"kernel","fixed_in":["5.10.14-1.mga7"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"kmod-virtualbox","fixed_in":["6.1.18-6.mga7"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"kmod-xtables-addons","fixed_in":["3.13-12.mga7"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-hwe-5.8","fixed_in":["5.8.0-43.49~20.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-oem-5.10","fixed_in":["5.10.0-1016.17"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-oem-5.6","fixed_in":["5.6.0-1047.51"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"linux-riscv-5.8","fixed_in":["5.8.0-16.18~20.04.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"AlmaLinux:8","package":"kernel-abi-whitelists","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.0-240.22.1.el8_3"}]}],"bundled":8},{"source":"osv","ecosystem":"AlmaLinux:8","package":"kernel-tools-libs-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.0-240.22.1.el8_3"}]}],"bundled":8},{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.13-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.13-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.13-1"}]}]},{"source":"osv","ecosystem":"Mageia:7","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.14-1.mga7"}]}]},{"source":"osv","ecosystem":"Mageia:7","package":"kmod-virtualbox","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.18-6.mga7"}]}]},{"source":"osv","ecosystem":"Mageia:7","package":"kmod-xtables-addons","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.13-12.mga7"}]}]},{"source":"osv","ecosystem":"Mageia:7","package":"kernel-linus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.14-1.mga7"}]}],"bundled":2},{"source":"osv","ecosystem":"Red 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local privilege escalation was discovered in the Linux kernel before 5.10.13. 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The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.","status":"published","published":"2021-02-05T14:15:18.78Z","modified":"2026-10-23T18:02:52.115312765Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"RHSA-2021:1081","title":"Red Hat Security Advisory: kernel-rt security and bug fix update","status":"published","published":"2024-09-13T22:13:33Z","modified":"2026-08-26T10:01:37Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:08.071325Z"},{"id":"RHSA-2021:1093","title":"Red Hat Security Advisory: kernel security, bug fix, and enhancement update","status":"published","published":"2024-09-13T22:13:41Z","modified":"2026-08-26T10:01:38Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:53:08.071325Z"},{"id":"UBUNTU-CVE-2021-26708","description":"A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.","status":"published","published":"2021-02-05T14:15:00Z","modified":"2026-02-04T03:38:25.936234Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"ALSA-2021:1093","title":"Important: 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\n* kernel: use after free in eventpoll.c may lead to escalation of privilege (CVE-2020-0466)\n\n* kernel: SCSI target (LIO) write to any block on ILO backstore (CVE-2020-28374)\n\n* kernel: Use after free via PI futex state (CVE-2021-3347)\n\n* kernel: race conditions caused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708)\n\n* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)\n\n* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)\n\n* Kernel: KVM: host stack overflow due to lazy update IOAPIC (CVE-2020-27152)\n\n* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nBug Fix(es):\n\n* race condition when creating child sockets from syncookies (BZ#1915529)\n\n* On System Z, a hash needs state randomized for entropy extraction (BZ#1915816)\n\n* scsi: target: core_tmr_abort_task() reporting multiple aborts for the same se_cmd-\u003etag (BZ#1918354)\n\n* [mlx5] VF interface stats are not reflected in \"ip -s link show\" / \"ifconfig \u003cvf\u003e\" commands (BZ#1921060)\n\n* Win10 guest automatic reboot after migration in Win10 and WSL2 on Intel hosts (BZ#1923281)\n\n* [AlmaLinux 8.3] Repeated messages - Unable to burst-read optrom segment (BZ#1924222)\n\n* Backport bug fix RDMA/umem: Prevent small pages from being returned by ib_umem_find_best_pgsz (BZ#1924691)\n\n* [Cisco 8.3] AlmaLinux/Cent 8.2 fNIC driver needs a patch fix that addresses crash (BZ#1925186)\n\n* AlmaLinux8.3 - The kernel misdetects zCX with z/VM (BZ#1925508)\n\n* Backport 22e4663e91 (\"mm/slub: fix panic in slab_alloc_node()\") (BZ#1925511)\n\n* SCTP \"Address already in use\" when no active endpoints from AlmaLinux 8.2 onwards (BZ#1927521)\n\n* lpfc: Fix initial FLOGI failure due to BBSCN not supported  (BZ#1927921)\n\n* [mm] mm, oom: remove oom_lock from oom_reaper (BZ#1929738)\n\n* Unexpected thread movement with AMD Milan compared to Rome (BZ#1929740)\n\n* rpmbuild cannot build the userspace RPMs in the kernel package when the kernel itself is not built (BZ#1929910)\n\n* [Regression] AlmaLinux8.2 - ISST-LTE:pVM:diapvmlp83:sum:memory DLPAR fails to add memory on multiple trials[mm/memory_hotplug.c:1163] (mm-) (BZ#1930168)\n\n* Configuring the system with non-RT kernel will hang the system (BZ#1930735)\n\n* Upstream Patch for Gracefully handle DMAR units with no supported address widthsx86/vt-d (BZ#1932199)\n\n* gfs2: Deadlock between gfs2_{create_inode,inode_lookup} and delete_work_func (BZ#1937109)\n\n* Failing on tsx-ctrl when the flag doesn't change anything (BZ#1939013)\n\nEnhancement(s):\n\n* RFE: Backport all Audit enhancements and fixes up to version 5.10-rc1 (BZ#1907520)\n\n* AlmaLinux8.4: Update the target driver (BZ#1918363)\n\n* [Mellanox 8.4 FEAT] mlx5: Hairpin Support in Switch Mode (BZ#1924689)","status":"published","published":"2021-04-06T13:33:17Z","modified":"2026-10-29T11:00:26.337854494Z","updated_at":"2026-11-02T15:27:51.196609Z"},{"id":"MGASA-2021-0084","title":"Updated kernel packages fix security vulnerability","description":"This kernel update is based on upstream 5.10.14 and fixes at least the\nfollowing security issues:\n\nA local privilege escalation was discovered in the Linux kernel before\n5.10.13. Multiple race conditions in the AF_VSOCK implementation are\ncaused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708).\n\nIt also adds the following fixes:\n- make CONNECTOR builtin to enable PROC_EVENTS (mga#28312)\n- drm/amd/display: Revert \"Fix EDID parsing after resume from suspend\"\n- drm/amdgpu: fix the issue that retry constantly once the buffer is oversize\n- drm/amdgpu: set default value of noretry to 1 for vega10\n- drm/amdgpu: default noretry=0 for navi1x and newer\n- drm/amdkfd: fix null pointer panic while free buffer in kfd\n- mm: thp: fix MADV_REMOVE deadlock on shmem THP\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2021-02-15T19:24:33Z","modified":"2026-04-16T04:40:39.119603948Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"MGASA-2021-0085","title":"Updated kernel-linus packages fix security vulnerabilities","description":"This kernel-linus update is based on upstream 5.10.14 and fixes at least\nthe following security issues:\n\nnbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12\nhas an ndb_queue_rq use-after-free that could be triggered by local\nattackers (with access to the nbd device) via an I/O request at a\ncertain point during device setup (CVE-2021-3348).\n\nA local privilege escalation was discovered in the Linux kernel before\n5.10.13. Multiple race conditions in the AF_VSOCK implementation are\ncaused by wrong locking in net/vmw_vsock/af_vsock.c (CVE-2021-26708).\n\nIt also adds the following fixes:\n- make CONNECTOR builtin to enable PROC_EVENTS (mga#28312)\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2021-02-15T19:24:33Z","modified":"2026-04-16T04:42:56.268543203Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2024:10728-1","title":"kernel-devel-5.14.6-1.4 on GA media","description":"These are all security issues fixed in the kernel-devel-5.14.6-1.4 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:31:50.908235Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"openSUSE-SU-2024:13704-1","title":"kernel-devel-longterm-6.6.17-1.1 on GA media","description":"These are all security issues fixed in the kernel-devel-longterm-6.6.17-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T04:07:48.417979Z","updated_at":"2026-11-02T16:58:36.327643Z"},{"id":"USN-4727-1","title":"linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oem-5.6, linux-oracle, linux-raspi  vulnerability","description":"Alexander Popov discovered that multiple race conditions existed in the\nAF_VSOCK implementation in the Linux kernel. A local attacker could use\nthis to cause a denial of service (system crash) or execute arbitrary code.\n","status":"published","published":"2021-02-10T00:54:45Z","modified":"2026-02-10T04:42:03Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}