{"id":"CVE-2022-24122","aliases":["AZL-8451","BELL-CVE-2022-24122","DEBIAN-CVE-2022-24122","EUVD-2022-29034","GHSA-qffg-f4f5-j77v","MGASA-2022-0041","MGASA-2022-0063","UBUNTU-CVE-2022-24122","USN-5278-1"],"status":"published","title":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are...","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","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":0.0101,"percentile":0.63533,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-416"],"published":"2022-01-29T21:33:55Z","modified":"2026-11-03T08:02:43Z","exploits":[{"source":"pocgithub","id":"meowmeowxw/CVE-2022-24122","title":"meowmeowxw/CVE-2022-24122","date":"2022-03-10","url":"https://github.com/meowmeowxw/CVE-2022-24122"}],"fixes":[{"ecosystem":"Azure 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Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-24122","tags":["web","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HSR3AI2IQGRKZCHNKF6S25JGDKUEAWWL/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VVSZKUJAZ2VN6LJ35J2B6YD6BOPQTU3B/"},{"url":"https://github.com/advisories/GHSA-qffg-f4f5-j77v"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2022-24122","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/24xxx/CVE-2022-24122.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2022-24122","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2022-0041.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29960","tags":["report"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29952","tags":["report"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29957","tags":["report"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29925","tags":["report"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.17","tags":["web"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.18","tags":["web"]},{"url":"https://advisories.mageia.org/MGASA-2022-0063.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=30031","tags":["report"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29965","tags":["report"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.19","tags":["web"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.20","tags":["web"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.21","tags":["web"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.22","tags":["web"]},{"url":"https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.23","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2022-24122","tags":["report"]},{"url":"https://git.kernel.org/linus/f9d87929d451d3e649699d0f1d74f71f77ad38f5","tags":["report"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9d87929d451d3e649699d0f1d74f71f77ad38f5","tags":["report"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c54b245d011855ea91c5beff07f1db74143ce614","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-5278-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-24122","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2020-27820","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-4001","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-4083","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-4135","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-4155","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-4197","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-22600","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28713","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28714","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-28715","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-39685","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-43975","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-44733","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-45095","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-45480","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-0264","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-0330","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-0382","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-22942","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2022-23222","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2022-24122","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T21:33:55Z","modified":"2024-08-03T03:59:23.92Z","updated_at":"2026-11-02T14:34:34.576287Z"}],"euvd":[{"id":"EUVD-2022-29034","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T21:33:55Z","modified":"2024-08-03T03:59:23Z","updated_at":"2026-11-03T03:25:50.168269Z"}],"ghsa":[{"id":"GHSA-qffg-f4f5-j77v","title":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are...","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-30T00:00:13Z","modified":"2023-11-18T05:04:35Z","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":"2026-11-02T14:55:03.903531Z"}],"nvd":[{"id":"CVE-2022-24122","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T22:15:07.487Z","modified":"2026-06-17T04:31:20.41Z","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":6.9,"vector":"AV:L/AC:M/Au:N/C:C/I:C/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:07:11.52734Z"}],"osv":[{"id":"AZL-8451","title":"CVE-2022-24122 affecting package kernel for versions less than 5.15.26.1-1","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T22:15:07Z","modified":"2026-04-21T04:34:49.881768Z","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":"2026-11-02T15:28:10.335477Z"},{"id":"BELL-CVE-2022-24122","title":"CVE-2022-24122 does not affect BellSoft software","status":"withdrawn","published":"2022-01-29T22:15:00Z","modified":"2026-01-26T09:49:52.443915Z","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":"2026-11-02T15:28:17.151188Z"},{"id":"DEBIAN-CVE-2022-24122","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T22:15:07.487Z","modified":"2026-11-03T08:02:43.846729348Z","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":"2026-11-03T08:24:39.643572Z"},{"id":"UBUNTU-CVE-2022-24122","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T22:15:00Z","modified":"2026-02-04T04:20:47.919796Z","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":"2026-11-02T16:53:53.13624Z"},{"id":"CVE-2022-24122","description":"kernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged user namespaces are enabled, allows a use-after-free and privilege escalation because a ucounts object can outlive its namespace.","status":"published","published":"2022-01-29T21:33:55Z","modified":"2026-10-28T02:30:58.95539178Z","updated_at":"2026-11-02T15:44:24.428403Z"},{"id":"MGASA-2022-0041","title":"Updated kernel packages fix security vulnerabilities","description":"This kernel update is based on upstream 5.15.18 and fixes at least the\nfollowing security issues:\n\nA random memory access flaw was found in the Linux kernels GPU i915 kernel\ndriver functionality in the way a user may run malicious code on the GPU.\nThis flaw allows a local user to crash the system or escalate their\nprivileges on the system (CVE-2022-0330).\n\nA use-after-free flaw was found in the Linux kernels\nvmw_execbuf_copy_fence_user function in drivers/gpu/drm/vmwgfx/\nvmwgfx_execbuf.c in vmwgfx. This flaw allows a local attacker with user\nprivileges to cause a privilege escalation problem (CVE-2022-22942).\n\nkernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged\nuser namespaces are enabled, allows a use-after-free and privilege\nescalation because a ucounts object can outlive its namespace\n(CVE-2022-24122).\n\nOther fixes in this update:\n- fix broken RTL8814AU support (mga#29952)\n- fix cifs failing to load on server kernels (mga#29957)\n- fix broken plymouth scaling (mga#29925)\n- bpf: Guard against accessing NULL pt_regs in bpf_get_task_stack()\n- fs/exec: require argv[0] presence in do_execveat_common()\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2022-02-01T15:26:02Z","modified":"2026-04-16T04:43:25.388508156Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"MGASA-2022-0063","title":"Updated kernel-linus packages fix security vulnerabilities","description":"This kernel-linus update is based on upstream 5.15.23 and fixes at least\nthe following security issues:\n\nA stack overflow flaw was found in the Linux kernel TIPC protocol\nfunctionality in the way a user sends a packet with malicious content\nwhere the number of domain member nodes is higher than the 64 allowed.\nThis flaw allows a remote user to crash the system or possibly escalate\ntheir privileges if they have access to the TIPC network (CVE-2022-0435).\n\nA vulnerability was found in the Linux kernel cgroup_release_agent_write\nin the kernel/cgroup/cgroup-v1.c function. This flaw, under certain\ncircumstances, allows the use of the cgroups v1 release_agent feature to\nescalate privileges and bypass the namespace isolation unexpectedly\n(CVE-2022-0492).\n\nkernel/ucount.c in the Linux kernel 5.14 through 5.16.4, when unprivileged\nuser namespaces are enabled, allows a use-after-free and privilege\nescalation because a ucounts object can outlive its namespace\n(CVE-2022-24122).\n\nAn issue was discovered in fs/nfs/dir.c in the Linux kernel before 5.16.5.\nIf an application sets the O_DIRECTORY flag, and tries to open a regular\nfile, nfs_atomic_open() performs a regular lookup. If a regular file is\nfound, ENOTDIR should occur, but the server instead returns uninitialized\ndata in the file descriptor (CVE-2022-24448).\n\nOther fixes in this update:\n- enable several missed MediaTek wifi drivers (mga#29965)\n\nFor other upstream fixes, see the referenced changelogs.\n","status":"published","published":"2022-02-15T20:50:31Z","modified":"2026-04-16T04:42:13.085893467Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"USN-5278-1","title":"linux-oem-5.14 vulnerabilities","description":"It was discovered that the rlimit tracking for user namespaces in the Linux\nkernel did not properly perform reference counting, leading to a use-after-\nfree vulnerability. A local attacker could use this to cause a denial of\nservice or possibly execute arbitrary code. (CVE-2022-24122)\n\nIt was discovered that the BPF verifier in the Linux kernel did not\nproperly restrict pointer types in certain situations. A local attacker\ncould use this to cause a denial of service (system crash) or possibly\nexecute arbitrary code. (CVE-2022-23222)\n\nJeremy Cline discovered a use-after-free in the nouveau graphics driver of\nthe Linux kernel during device removal. A privileged or physically\nproximate attacker could use this to cause a denial of service (system\ncrash). (CVE-2020-27820)\n\nIt was discovered that the Packet network protocol implementation in the\nLinux kernel contained a double-free vulnerability. A local attacker could\nuse this to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2021-22600)\n\nJürgen Groß discovered that the Xen subsystem within the Linux kernel did\nnot adequately limit the number of events driver domains (unprivileged PV\nbackends) could send to other guest VMs. An attacker in a driver domain\ncould use this to cause a denial of service in other guest VMs.\n(CVE-2021-28713)\n\nJürgen Groß discovered that the Xen network backend driver in the Linux\nkernel did not adequately limit the amount of queued packets when a guest\ndid not process them. An attacker in a guest VM can use this to cause a\ndenial of service (excessive kernel memory consumption) in the network\nbackend domain. (CVE-2021-28714, CVE-2021-28715)\n\nSzymon Heidrich discovered that the USB Gadget subsystem in the Linux\nkernel did not properly restrict the size of control requests for certain\ngadget types, leading to possible out of bounds reads or writes. A local\nattacker could use this to cause a denial of service (system crash) or\npossibly execute arbitrary code. (CVE-2021-39685)\n\nIt was discovered that the eBPF implementation in the Linux kernel\ncontained a race condition around read-only maps. A privileged attacker\ncould use this to modify read-only maps. (CVE-2021-4001)\n\nJann Horn discovered a race condition in the Unix domain socket\nimplementation in the Linux kernel that could result in a read-after-free.\nA local attacker could use this to cause a denial of service (system crash)\nor possibly execute arbitrary code. (CVE-2021-4083)\n\nIt was discovered that the simulated networking device driver for the Linux\nkernel did not properly initialize memory in certain situations. A local\nattacker could use this to expose sensitive information (kernel memory).\n(CVE-2021-4135)\n\nKirill Tkhai discovered that the XFS file system implementation in the\nLinux kernel did not calculate size correctly when pre-allocating space in\nsome situations. A local attacker could use this to expose sensitive\ninformation. (CVE-2021-4155)\n\nEric Biederman discovered that the cgroup process migration implementation\nin the Linux kernel did not perform permission checks correctly in some\nsituations. A local attacker could possibly use this to gain administrative\nprivileges. (CVE-2021-4197)\n\nBrendan Dolan-Gavitt discovered that the aQuantia AQtion Ethernet device\ndriver in the Linux kernel did not properly validate meta-data coming from\nthe device. A local attacker who can control an emulated device can use\nthis to cause a denial of service (system crash) or possibly execute\narbitrary code. (CVE-2021-43975)\n\nIt was discovered that the ARM Trusted Execution Environment (TEE)\nsubsystem in the Linux kernel contained a race condition leading to a use-\nafter-free vulnerability. A local attacker could use this to cause a denial\nof service or possibly execute arbitrary code. (CVE-2021-44733)\n\nIt was discovered that the Phone Network protocol (PhoNet) implementation\nin the Linux kernel did not properly perform reference counting in some\nerror conditions. A local attacker could possibly use this to cause a\ndenial of service (memory exhaustion). (CVE-2021-45095)\n\nIt was discovered that the Reliable Datagram Sockets (RDS) protocol\nimplementation in the Linux kernel did not properly deallocate memory in\nsome error conditions. A local attacker could possibly use this to cause a\ndenial of service (memory exhaustion). (CVE-2021-45480)\n\nIt was discovered that the BPF subsystem in the Linux kernel did not\nproperly track pointer types on atomic fetch operations in some situations.\nA local attacker could use this to expose sensitive information (kernel\npointer addresses). (CVE-2022-0264)\n\nSushma Venkatesh Reddy discovered that the Intel i915 graphics driver in\nthe Linux kernel did not perform a GPU TLB flush in some situations. A\nlocal attacker could use this to cause a denial of service or possibly\nexecute arbitrary code. (CVE-2022-0330)\n\nIt was discovered that the TIPC Protocol implementation in the Linux kernel\ndid not properly initialize memory in some situations. A local attacker\ncould use this to expose sensitive information (kernel memory).\n(CVE-2022-0382)\n\nIt was discovered that the VMware Virtual GPU driver in the Linux kernel\ndid not properly handle certain failure conditions, leading to a stale\nentry in the file descriptor table. A local attacker could use this to\nexpose sensitive information or possibly gain administrative privileges.\n(CVE-2022-22942)\n","status":"published","published":"2022-02-09T02:16:11Z","modified":"2026-09-14T11:17:31.49002489Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}