CVE-2022-50095

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Then, as it calls exit_itimers, posix_cpu_timer_del cannot find\nthe task because the timer still points out to the old PID.\n\nThat means that armed timers won't be disarmed, that is, they won't be\nremoved from the timerqueue_list. exit_itimers will still release their\nmemory, and when that list is later processed, it leads to a\nuse-after-free.\n\nClean up the timers from the de-threaded task before freeing them. This\nprevents a reported use-after-free."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local syscalls (clone/pthread_create, timer_create/timer_settime with CLOCK_THREAD_CPUTIME_ID, and execve from a non-leader thread); there is no network or adjacent-vector path into this code.\nAC:L - The bug is a deterministic logic error on the non-leader exec path after PID exchange, not a race against conditions the attacker cannot control; the attacker reliably creates, arms, and triggers the dangling timerqueue entry.\nPR:L - An unprivileged local user can create threads, create and arm self-targeted POSIX CPU timers, and call execve; no capabilities or init-namespace root are required.\nUI:N - The attacker performs all steps themselves; no separate victim action is needed to reach or trigger the use-after-free.\nS:U - Impact is confined to the local kernel/OS authority (standard kernel memory corruption / privilege escalation); it does not cross a VM, IOMMU, or other security boundary.\nC:H - The freed k_itimer remains linked in the per-thread CPU timerqueue and is later processed by run_posix_cpu_timers, yielding a kernel UAF that can be leveraged for arbitrary memory disclosure.\nI:H - The same UAF of a slab-allocated k_itimer enables heap reuse and write/control-flow primitives consistent with kernel timer-object corruption.\nA:H - Processing the dangling timerqueue entry after free causes kernel oops/panic or otherwise crashes the system even when not fully exploited for code execution."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/exec.c"], "versions": [{"version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "lessThan": "541840859ace9c2ccebc32fa9e376c7bd3def490", "status": "affected", "versionType": "git"}, {"version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "lessThan": "9e255ed238fc67058df87b0388ad6d4b2ef3a2bd", "status": "affected", "versionType": "git"}, {"version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "lessThan": "e8cb6e8fd9890780f1bfcf5592889e1b879e779c", "status": "affected", "versionType": "git"}, {"version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "lessThan": "b2fc1723eb65abb83e00d5f011de670296af0b28", "status": "affected", "versionType": "git"}, {"version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "lessThan": "e362359ace6f87c201531872486ff295df306d13", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/exec.c"], "versions": [{"version": "5.7", "status": "affected"}, {"version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.137", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.61", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18.18", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.2", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.10.137"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.61"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.18.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.19.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/541840859ace9c2ccebc32fa9e376c7bd3def490"}, {"url": "https://git.kernel.org/stable/c/9e255ed238fc67058df87b0388ad6d4b2ef3a2bd"}, {"url": "https://git.kernel.org/stable/c/e8cb6e8fd9890780f1bfcf5592889e1b879e779c"}, {"url": "https://git.kernel.org/stable/c/b2fc1723eb65abb83e00d5f011de670296af0b28"}, {"url": "https://git.kernel.org/stable/c/e362359ace6f87c201531872486ff295df306d13"}], "title": "posix-cpu-timers: Cleanup CPU timers before freeing them during exec", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/exec.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "541840859ace9c2ccebc32fa9e376c7bd3def490", "status": "affected", "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "versionType": "git"}, {"lessThan": "9e255ed238fc67058df87b0388ad6d4b2ef3a2bd", "status": "affected", "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "versionType": "git"}, {"lessThan": "e8cb6e8fd9890780f1bfcf5592889e1b879e779c", "status": "affected", "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "versionType": "git"}, {"lessThan": "b2fc1723eb65abb83e00d5f011de670296af0b28", "status": "affected", "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "versionType": "git"}, {"lessThan": "e362359ace6f87c201531872486ff295df306d13", "status": "affected", "version": "55e8c8eb2c7b6bf30e99423ccfe7ca032f498f59", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/exec.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.7"}, {"lessThan": "5.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.137", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.61", "versionType": "semver"}, {"lessThanOrEqual": "5.18.*", "status": "unaffected", "version": "5.18.18", "versionType": "semver"}, {"lessThanOrEqual": "5.19.*", "status": "unaffected", "version": "5.19.2", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "674AABE4-BC3E-4530-9717-5DFE7AB70A3F", "versionEndExcluding": "5.10.137", "versionStartIncluding": "5.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "51861563-7F40-460F-82CD-2D3FBDAD6618", "versionEndExcluding": "5.15.61", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5B42E453-8837-49D0-A5EF-03F818A6DC11", "versionEndExcluding": "5.18.18", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A1A2A5A5-4598-4D7E-BA07-4660398D6C8F", "versionEndExcluding": "5.19.2", "versionStartIncluding": "5.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nposix-cpu-timers: Cleanup CPU timers before freeing them during exec\n\nCommit 55e8c8eb2c7b (\"posix-cpu-timers: Store a reference to a pid not a\ntask\") started looking up tasks by PID when deleting a CPU timer.\n\nWhen a non-leader thread calls execve, it will switch PIDs with the leader\nprocess. Then, as it calls exit_itimers, posix_cpu_timer_del cannot find\nthe task because the timer still points out to the old PID.\n\nThat means that armed timers won't be disarmed, that is, they won't be\nremoved from the timerqueue_list. exit_itimers will still release their\nmemory, and when that list is later processed, it leads to a\nuse-after-free.\n\nClean up the timers from the de-threaded task before freeing them. This\nprevents a reported use-after-free."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: posix-cpu-timers: Limpiar los temporizadores de CPU antes de liberarlos durante la ejecuci\u00f3n. el commit 55e8c8eb2c7b (\"posix-cpu-timers: Almacenar una referencia a un PID, no a una tarea\") comenz\u00f3 a buscar tareas por PID al eliminar un temporizador de CPU. Cuando un subproceso no l\u00edder llama a execve, intercambia los PID con el proceso l\u00edder. Luego, al llamar a exit_itimers, posix_cpu_timer_del no puede encontrar la tarea porque el temporizador a\u00fan apunta al PID anterior. Esto significa que los temporizadores armados no se desarmar\u00e1n; es decir, no se eliminar\u00e1n de timerqueue_list. exit_itimers liberar\u00e1 su memoria y, cuando esa lista se procese posteriormente, se generar\u00e1 un Use-After-Free. Limpie los temporizadores de la tarea desprovista de subprocesos antes de liberarlos. Esto evita un Use-After-Free reportado."}], "id": "CVE-2022-50095", "lastModified": "2026-08-04T10:18:04.777", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T11:15:38.740", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/541840859ace9c2ccebc32fa9e376c7bd3def490"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e255ed238fc67058df87b0388ad6d4b2ef3a2bd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b2fc1723eb65abb83e00d5f011de670296af0b28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e362359ace6f87c201531872486ff295df306d13"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e8cb6e8fd9890780f1bfcf5592889e1b879e779c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:7318", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-70.30.1.el9_0", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-02T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:7318", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-70.30.1.el9_0", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-02T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: posix-cpu-timers: Cleanup CPU timers before freeing them during exec", "id": "2373693", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373693"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-459", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nposix-cpu-timers: Cleanup CPU timers before freeing them during exec\nCommit 55e8c8eb2c7b (\"posix-cpu-timers: Store a reference to a pid not a\ntask\") started looking up tasks by PID when deleting a CPU timer.\nWhen a non-leader thread calls execve, it will switch PIDs with the leader\nprocess. Then, as it calls exit_itimers, posix_cpu_timer_del cannot find\nthe task because the timer still points out to the old PID.\nThat means that armed timers won't be disarmed, that is, they won't be\nremoved from the timerqueue_list. exit_itimers will still release their\nmemory, and when that list is later processed, it leads to a\nuse-after-free.\nClean up the timers from the de-threaded task before freeing them. This\nprevents a reported use-after-free."], "name": "CVE-2022-50095", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50095\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50095\nhttps://lore.kernel.org/linux-cve-announce/2025061802-CVE-2022-50095-981c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:53:46.917410+00:00", "updated": "2025-06-23T08:53:46.917475+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}