{"id":"CVE-2021-43057","aliases":["AZL-6602","DEBIAN-CVE-2021-43057","EUVD-2021-30010","GHSA-h3xq-35q6-gh9g","UBUNTU-CVE-2021-43057","USN-5162-1"],"status":"published","title":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in...","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","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":"2026-11-11","score":0.00491,"percentile":0.42654,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2021-10-28T03:36:24Z","modified":"2026-10-23T18:03:38Z","fixes":[{"ecosystem":"Azure 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Party Advisory","fix","report"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a3727a8bac0a9e77c70820655fd8715523ba3db7","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","fix","report"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.8","tags":["x_refsource_MISC","x_transferred","Patch","Release Notes","Vendor Advisory","fix","report"]},{"url":"https://security.netapp.com/advisory/ntap-20211125-0001/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43057","tags":["web"]},{"url":"https://github.com/advisories/GHSA-h3xq-35q6-gh9g"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-43057","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-43057","tags":["report"]},{"url":"https://git.kernel.org/linus/a3727a8bac0a9e77c70820655fd8715523ba3db7","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5162-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43057","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3655","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3744","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-3764","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-42252","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-43057","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T03:36:24Z","modified":"2024-08-04T03:47:13.197Z","updated_at":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-30010","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T03:36:24Z","modified":"2024-08-04T03:47:13Z","updated_at":"2026-11-03T03:24:14.796505Z"}],"ghsa":[{"id":"GHSA-h3xq-35q6-gh9g","title":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in...","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2022-05-24T19:19:11Z","modified":"2023-03-01T21:30:19Z","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-416"],"updated_at":"2026-11-02T14:54:15.073729Z"}],"nvd":[{"id":"CVE-2021-43057","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T04:15:08.27Z","modified":"2026-06-17T04:10:27.183Z","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":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:07:00.549994Z"}],"osv":[{"id":"AZL-6602","title":"CVE-2021-43057 affecting package kernel for versions less than 5.15.2.1-1","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T04:15:08Z","modified":"2026-04-21T04:37:44.923814Z","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":"2026-11-02T15:28:08.354547Z"},{"id":"CVE-2021-43057","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T04:15:08.27Z","modified":"2026-03-15T22:42:08.520983Z","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":"2026-11-02T15:44:21.557945Z"},{"id":"DEBIAN-CVE-2021-43057","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T04:15:08.27Z","modified":"2026-10-23T18:03:38.925167124Z","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":"2026-11-02T15:45:35.799676Z"},{"id":"UBUNTU-CVE-2021-43057","description":"An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.","status":"published","published":"2021-10-28T04:15:00Z","modified":"2026-02-04T03:00:09.651418Z","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":"2026-11-02T15:54:29.220315Z"},{"id":"USN-5162-1","title":"linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem-5.13, linux-oracle, linux-raspi vulnerabilities","description":"Ilja Van Sprundel discovered that the SCTP implementation in the Linux\nkernel did not properly perform size validations on incoming packets in\nsome situations. An attacker could possibly use this to expose sensitive\ninformation (kernel memory). (CVE-2021-3655)\n\nIt was discovered that the AMD Cryptographic Coprocessor (CCP) driver in\nthe Linux kernel did not properly deallocate memory in some error\nconditions. A local attacker could use this to cause a denial of service\n(memory exhaustion). (CVE-2021-3744, CVE-2021-3764)\n\nIt was discovered that the Aspeed Low Pin Count (LPC) Bus Controller\nimplementation in the Linux kernel did not properly perform boundary checks\nin some situations, allowing out-of-bounds write access. A local attacker\ncould use this to cause a denial of service (system crash) or possibly\nexecute arbitrary code. In Ubuntu, this issue only affected systems running\narmhf kernels. (CVE-2021-42252)\n\nJann Horn discovered that the SELinux subsystem in the Linux kernel did not\nproperly handle subjective credentials for tasks in some situations. On\nsystems where SELinux has been enabled, a local attacker could possibly use\nthis to cause a denial of service (system crash) or execute arbitrary code.\n(CVE-2021-43057)\n","status":"published","published":"2021-11-30T22:22:53Z","modified":"2026-09-14T11:17:24.052858952Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}