CVE-2022-48989

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Once the cookie is withdrawn the object is removed\nthe below oops will occur because the object associated with the cookie\nis now NULL.\n\nFix the oops by clearing the LRU_DISCARD bit if another thread uses the\ncookie before the cookie_worker runs.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000008\n ...\n CPU: 31 PID: 44773 Comm: kworker/u130:1 Tainted: G E 6.0.0-5.dneg.x86_64 #1\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022\n Workqueue: events_unbound netfs_rreq_write_to_cache_work [netfs]\n RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles]\n ...\n Call Trace:\n netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs]\n process_one_work+0x217/0x3e0\n worker_thread+0x4a/0x3b0\n kthread+0xd6/0x100"}], "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 - The race is in local fscache cookie LRU discard vs use_cookie, reached by open/close/I/O on an fscache-backed netfs (NFS/CIFS/AFS/Ceph/9p/erofs) with cachefiles; it is not triggered by remote packet processing.\nAC:L - The attacker controls both sides\u2014closing a cached file to place the cookie on the LRU, waiting for the ~10s LRU timeout that sets DO_LRU_DISCARD, then reopening/doing I/O so use_cookie races the cookie_worker\u2014making the race reliably repeatable.\nPR:L - Binding /dev/cachefiles needs CAP_SYS_ADMIN, but once cachefiles is active (common on NFS/CIFS caching hosts), an unprivileged user triggers use_cookie/unuse_cookie via ordinary opens of already-mounted fscache-backed files.\nUI:N - The attacker drives open/close/reopen and I/O on the cached mount themselves; no separate victim action is required.\nS:U - Impact stays in the host kernel privilege domain (cookie/object lifetime); this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Withdrawing the cookie clears cache_priv and can free the cachefiles_object while I/O paths (e.g. cachefiles_prepare_write) hold an unpinned local object pointer\u2014a use-after-free that enables heap reuse and arbitrary kernel read primitives.\nI:H - The same UAF on the freed cachefiles_object (no grab in begin_operation/prepare_write) is heap-sprayable and can yield arbitrary write/control-flow hijack primitives in kernel context.\nA:H - The documented failure is a kernel NULL pointer dereference in cachefiles_prepare_write (oops/panic), and the UAF path remains crashable even without full exploitation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/fscache/cookie.c", "include/trace/events/fscache.h"], "versions": [{"version": "12bb21a29c19aae50cfad4e2bb5c943108f34a7d", "lessThan": "37f0b459c9b67e14fe4dcc3a15d286c4436ed01d", "status": "affected", "versionType": "git"}, {"version": "12bb21a29c19aae50cfad4e2bb5c943108f34a7d", "lessThan": "b5b52de3214a29911f949459a79f6640969b5487", "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/fscache/cookie.c", "include/trace/events/fscache.h"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.13", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "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": "5.17", "versionEndExcluding": "6.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/37f0b459c9b67e14fe4dcc3a15d286c4436ed01d"}, {"url": "https://git.kernel.org/stable/c/b5b52de3214a29911f949459a79f6640969b5487"}], "title": "fscache: Fix oops due to race with cookie_lru and use_cookie", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-48989", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:16:49.876509Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:42.490Z"}}]}}

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Once the cookie is withdrawn the object is removed\nthe below oops will occur because the object associated with the cookie\nis now NULL.\n\nFix the oops by clearing the LRU_DISCARD bit if another thread uses the\ncookie before the cookie_worker runs.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000008\n ...\n CPU: 31 PID: 44773 Comm: kworker/u130:1 Tainted: G E 6.0.0-5.dneg.x86_64 #1\n Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022\n Workqueue: events_unbound netfs_rreq_write_to_cache_work [netfs]\n RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles]\n ...\n Call Trace:\n netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs]\n process_one_work+0x217/0x3e0\n worker_thread+0x4a/0x3b0\n kthread+0xd6/0x100"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fscache: Corregir oops debido a ejecuci\u00f3n con cookie_lru y use_cookie Si una cookie caduca desde la LRU y el indicador LRU_DISCARD est\u00e1 configurado, pero la m\u00e1quina de estado a\u00fan no se ha ejecutado, es posible que otro hilo pueda llamar a fscache_use_cookie y comenzar a usarlo. Cuando finalmente se ejecuta cookie_worker, ver\u00e1 el indicador LRU_DISCARD configurado, har\u00e1 la transici\u00f3n de cookie->state a LRU_DISCARDING, que luego retirar\u00e1 la cookie. Una vez que se retira la cookie, se elimina el objeto, se producir\u00e1n los siguientes oops porque el objeto asociado con la cookie ahora es NULL. Corrija los oops borrando el bit LRU_DISCARD si otro hilo usa la cookie antes de que se ejecute cookie_worker. ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000008 ... CPU: 31 PID: 44773 Comm: kworker/u130:1 Contaminado: GE 6.0.0-5.dneg.x86_64 #1 Nombre del hardware: Google Compute Engine/Google Compute Engine, BIOS Google 26/08/2022 Cola de trabajo: events_unbound netfs_rreq_write_to_cache_work [netfs] RIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles] ... Seguimiento de llamadas: netfs_rreq_write_to_cache_work+0x11c/0x320 [netfs] process_one_work+0x217/0x3e0 worker_thread+0x4a/0x3b0 hilo+0xd6/0x100"}], "id": "CVE-2022-48989", "lastModified": "2026-08-04T10:17:29.803", "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": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48989", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:16:49.876509Z", "version": "2.0.3"}}]}, "published": "2024-10-21T20:15:10.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37f0b459c9b67e14fe4dcc3a15d286c4436ed01d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b5b52de3214a29911f949459a79f6640969b5487"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: fscache: Fix oops due to race with cookie_lru and use_cookie", "id": "2320707", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320707"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfscache: Fix oops due to race with cookie_lru and use_cookie\nIf a cookie expires from the LRU and the LRU_DISCARD flag is set, but\nthe state machine has not run yet, it's possible another thread can call\nfscache_use_cookie and begin to use it.\nWhen the cookie_worker finally runs, it will see the LRU_DISCARD flag\nset, transition the cookie->state to LRU_DISCARDING, which will then\nwithdraw the cookie. Once the cookie is withdrawn the object is removed\nthe below oops will occur because the object associated with the cookie\nis now NULL.\nFix the oops by clearing the LRU_DISCARD bit if another thread uses the\ncookie before the cookie_worker runs.\nBUG: kernel NULL pointer dereference, address: 0000000000000008\n...\nCPU: 31 PID: 44773 Comm: kworker/u130:1 Tainted: G E 6.0.0-5.dneg.x86_64 #1\nHardware name: Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022\nWorkqueue: events_unbound netfs_rreq_write_to_cache_work [netfs]\nRIP: 0010:cachefiles_prepare_write+0x28/0x90 [cachefiles]\n...\nCall Trace:\nnetfs_rreq_write_to_cache_work+0x11c/0x320 [netfs]\nprocess_one_work+0x217/0x3e0\nworker_thread+0x4a/0x3b0\nkthread+0xd6/0x100"], "name": "CVE-2022-48989", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48989\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48989\nhttps://lore.kernel.org/linux-cve-announce/2024102148-CVE-2022-48989-54c3@gregkh/T"], "threat_severity": "Moderate"}

{}