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CVE-2024-50121 (GCVE-0-2024-50121)

Vulnerability from cvelistv5 – Published: 2024-11-05 17:10 – Updated: 2026-05-23 15:54
VLAI
Title
nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net In the normal case, when we excute `echo 0 > /proc/fs/nfsd/threads`, the function `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` will release all resources related to the hashed `nfs4_client`. If the `nfsd_client_shrinker` is running concurrently, the `expire_client` function will first unhash this client and then destroy it. This can lead to the following warning. Additionally, numerous use-after-free errors may occur as well. nfsd_client_shrinker echo 0 > /proc/fs/nfsd/threads expire_client nfsd_shutdown_net unhash_client ... nfs4_state_shutdown_net /* won't wait shrinker exit */ /* cancel_work(&nn->nfsd_shrinker_work) * nfsd_file for this /* won't destroy unhashed client1 */ * client1 still alive nfs4_state_destroy_net */ nfsd_file_cache_shutdown /* trigger warning */ kmem_cache_destroy(nfsd_file_slab) kmem_cache_destroy(nfsd_file_mark_slab) /* release nfsd_file and mark */ __destroy_client ==================================================================== BUG nfsd_file (Not tainted): Objects remaining in nfsd_file on __kmem_cache_shutdown() -------------------------------------------------------------------- CPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1 dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xac/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e ==================================================================== BUG nfsd_file_mark (Tainted: G B W ): Objects remaining nfsd_file_mark on __kmem_cache_shutdown() -------------------------------------------------------------------- dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xc8/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e To resolve this issue, cancel `nfsd_shrinker_work` using synchronous mode in nfs4_state_shutdown_net.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-12-11 14:48 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2bbf10861d51dae76c6da7113516d0071c782653 , < f67138dd338cb564ade7d3755c8cd4f68b46d397 (git)
Affected: 958294a3eb82026fcfff20b0287a90e9c854785e , < 5ade4382de16c34d9259cb548f36ec5c4555913c (git)
Affected: f3ea5ec83d1a827f074b2b660749817e0bf2b23e , < 36775f42e039b01d4abe8998bf66771a37d3cdcc (git)
Affected: 7c24fa225081f31bc6da6a355c1ba801889ab29a , < f965dc0f099a54fca100acf6909abe52d0c85328 (git)
Affected: 7c24fa225081f31bc6da6a355c1ba801889ab29a , < add1df5eba163a3a6ece11cb85890e2e410baaea (git)
Affected: 7c24fa225081f31bc6da6a355c1ba801889ab29a , < d5ff2fb2e7167e9483846e34148e60c0c016a1f6 (git)
Affected: 5.10.220 , < 5.10.233 (semver)
Affected: 5.15.154 , < 5.15.176 (semver)
Affected: 6.1.81 , < 6.1.123 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 5.10.233 , ≤ 5.10.* (semver)
Unaffected: 5.15.176 , ≤ 5.15.* (semver)
Unaffected: 6.1.123 , ≤ 6.1.* (semver)
Unaffected: 6.6.59 , ≤ 6.6.* (semver)
Unaffected: 6.11.6 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
guessed Create a notification for this product.
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    "datePublished": "2024-11-05T17:10:50.523Z",
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      "date": "2026-09-17",
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      "cve": "CVE-2024-50121",
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      "title": "nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50121\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-05T18:15:15.080\",\"lastModified\":\"2026-06-17T08:03:38.553\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net\\n\\nIn the normal case, when we excute `echo 0 \u003e /proc/fs/nfsd/threads`, the\\nfunction `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` will\\nrelease all resources related to the hashed `nfs4_client`. If the\\n`nfsd_client_shrinker` is running concurrently, the `expire_client`\\nfunction will first unhash this client and then destroy it. This can\\nlead to the following warning. Additionally, numerous use-after-free\\nerrors may occur as well.\\n\\nnfsd_client_shrinker         echo 0 \u003e /proc/fs/nfsd/threads\\n\\nexpire_client                nfsd_shutdown_net\\n  unhash_client                ...\\n                               nfs4_state_shutdown_net\\n                                 /* won\u0027t wait shrinker exit */\\n  /*                             cancel_work(\u0026nn-\u003enfsd_shrinker_work)\\n   * nfsd_file for this          /* won\u0027t destroy unhashed client1 */\\n   * client1 still alive         nfs4_state_destroy_net\\n   */\\n\\n                               nfsd_file_cache_shutdown\\n                                 /* trigger warning */\\n                                 kmem_cache_destroy(nfsd_file_slab)\\n                                 kmem_cache_destroy(nfsd_file_mark_slab)\\n  /* release nfsd_file and mark */\\n  __destroy_client\\n\\n====================================================================\\nBUG nfsd_file (Not tainted): Objects remaining in nfsd_file on\\n__kmem_cache_shutdown()\\n--------------------------------------------------------------------\\nCPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1\\n\\n dump_stack_lvl+0x53/0x70\\n slab_err+0xb0/0xf0\\n __kmem_cache_shutdown+0x15c/0x310\\n kmem_cache_destroy+0x66/0x160\\n nfsd_file_cache_shutdown+0xac/0x210 [nfsd]\\n nfsd_destroy_serv+0x251/0x2a0 [nfsd]\\n nfsd_svc+0x125/0x1e0 [nfsd]\\n write_threads+0x16a/0x2a0 [nfsd]\\n nfsctl_transaction_write+0x74/0xa0 [nfsd]\\n vfs_write+0x1a5/0x6d0\\n ksys_write+0xc1/0x160\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n====================================================================\\nBUG nfsd_file_mark (Tainted: G    B   W         ): Objects remaining\\nnfsd_file_mark on __kmem_cache_shutdown()\\n--------------------------------------------------------------------\\n\\n dump_stack_lvl+0x53/0x70\\n slab_err+0xb0/0xf0\\n __kmem_cache_shutdown+0x15c/0x310\\n kmem_cache_destroy+0x66/0x160\\n nfsd_file_cache_shutdown+0xc8/0x210 [nfsd]\\n nfsd_destroy_serv+0x251/0x2a0 [nfsd]\\n nfsd_svc+0x125/0x1e0 [nfsd]\\n write_threads+0x16a/0x2a0 [nfsd]\\n nfsctl_transaction_write+0x74/0xa0 [nfsd]\\n vfs_write+0x1a5/0x6d0\\n ksys_write+0xc1/0x160\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nTo resolve this issue, cancel `nfsd_shrinker_work` using synchronous\\nmode in nfs4_state_shutdown_net.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: cancelar nfsd_shrinker_work usando el modo de sincronizaci\u00f3n en nfs4_state_shutdown_net. En el caso normal, cuando ejecutamos `echo 0 \u0026gt; /proc/fs/nfsd/threads`, la funci\u00f3n `nfs4_state_destroy_net` en `nfs4_state_shutdown_net` liberar\u00e1 todos los recursos relacionados con el `nfs4_client` con hash. Si `nfsd_client_shrinker` se est\u00e1 ejecutando simult\u00e1neamente, la funci\u00f3n `expire_client` primero deshar\u00e1 el hash de este cliente y luego lo destruir\u00e1. Esto puede generar la siguiente advertencia. Adem\u00e1s, tambi\u00e9n pueden ocurrir numerosos errores de use-after-free. nfsd_client_shrinker echo 0 \u0026gt; /proc/fs/nfsd/threads expire_client nfsd_shutdown_net unhash_client ... nfs4_state_shutdown_net /* no esperar\u00e1 a que el reductor salga */ /* cancel_work(\u0026amp;nn-\u0026gt;nfsd_shrinker_work) * nfsd_file para esto /* no destruir\u00e1 el cliente1 sin hash */ * el cliente1 sigue activo nfs4_state_destroy_net */ nfsd_file_cache_shutdown /* advertencia de activaci\u00f3n */ kmem_cache_destroy(nfsd_file_slab) kmem_cache_destroy(nfsd_file_mark_slab) /* liberar nfsd_file y marcar */ __destroy_client ============================================================================ ERROR nfsd_file (no contaminado): objetos restantes en nfsd_file en __kmem_cache_shutdown() -------------------------------------------------------------------- CPU: 4 UID: 0 PID: 764 Comm: sh No contaminado 6.12.0-rc3+ #1 dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xac/0x210 [nfsd] nfsd_destroy_serv+0x251/0x2a0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e ========================================================================= ERROR nfsd_file_mark (Corrompido: GBW): Objetos que permanecen en nfsd_file_mark en __kmem_cache_shutdown() -------------------------------------------------------------------- dump_stack_lvl+0x53/0x70 slab_err+0xb0/0xf0 __kmem_cache_shutdown+0x15c/0x310 kmem_cache_destroy+0x66/0x160 nfsd_file_cache_shutdown+0xc8/0x210 [nfsd] Para resolver este problema, cancele `nfsd_shrinker_work` usando el modo sincr\u00f3nico en nfs4_state_shutdown_net.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfsd/nfs4state.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2bbf10861d51dae76c6da7113516d0071c782653\",\"lessThan\":\"f67138dd338cb564ade7d3755c8cd4f68b46d397\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"958294a3eb82026fcfff20b0287a90e9c854785e\",\"lessThan\":\"5ade4382de16c34d9259cb548f36ec5c4555913c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f3ea5ec83d1a827f074b2b660749817e0bf2b23e\",\"lessThan\":\"36775f42e039b01d4abe8998bf66771a37d3cdcc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c24fa225081f31bc6da6a355c1ba801889ab29a\",\"lessThan\":\"f965dc0f099a54fca100acf6909abe52d0c85328\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c24fa225081f31bc6da6a355c1ba801889ab29a\",\"lessThan\":\"add1df5eba163a3a6ece11cb85890e2e410baaea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7c24fa225081f31bc6da6a355c1ba801889ab29a\",\"lessThan\":\"d5ff2fb2e7167e9483846e34148e60c0c016a1f6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.220\",\"lessThan\":\"5.10.233\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.154\",\"lessThan\":\"5.15.176\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.81\",\"lessThan\":\"6.1.123\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfsd/nfs4state.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.233\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.176\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.123\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.59\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.11.6\",\"lessThanOrEqual\":\"6.11.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 TM MFP - 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:42:15+00:00",
      "cve": "CVE-2024-50121",
      "id": "CVE-2024-50121",
      "initial_release_date": "2024-11-05T00:00:00+00:00",
      "product_status:fixed": "584",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "48",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-50121.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T20:43:43.437Z\"}}, {\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-265688.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-05-12T12:00:15.174Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50121\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-11T14:48:54.353206Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-12-11T14:48:55.757Z\"}}], \"cna\": {\"title\": \"nfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2bbf10861d51dae76c6da7113516d0071c782653\", \"lessThan\": \"f67138dd338cb564ade7d3755c8cd4f68b46d397\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"958294a3eb82026fcfff20b0287a90e9c854785e\", \"lessThan\": \"5ade4382de16c34d9259cb548f36ec5c4555913c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f3ea5ec83d1a827f074b2b660749817e0bf2b23e\", \"lessThan\": \"36775f42e039b01d4abe8998bf66771a37d3cdcc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c24fa225081f31bc6da6a355c1ba801889ab29a\", \"lessThan\": \"f965dc0f099a54fca100acf6909abe52d0c85328\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c24fa225081f31bc6da6a355c1ba801889ab29a\", \"lessThan\": \"add1df5eba163a3a6ece11cb85890e2e410baaea\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c24fa225081f31bc6da6a355c1ba801889ab29a\", \"lessThan\": \"d5ff2fb2e7167e9483846e34148e60c0c016a1f6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.220\", \"lessThan\": \"5.10.233\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.154\", \"lessThan\": \"5.15.176\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.81\", \"lessThan\": \"6.1.123\", \"versionType\": \"semver\"}], \"programFiles\": [\"fs/nfsd/nfs4state.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.233\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.176\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.123\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.59\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfsd/nfs4state.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f67138dd338cb564ade7d3755c8cd4f68b46d397\"}, {\"url\": \"https://git.kernel.org/stable/c/5ade4382de16c34d9259cb548f36ec5c4555913c\"}, {\"url\": \"https://git.kernel.org/stable/c/36775f42e039b01d4abe8998bf66771a37d3cdcc\"}, {\"url\": \"https://git.kernel.org/stable/c/f965dc0f099a54fca100acf6909abe52d0c85328\"}, {\"url\": \"https://git.kernel.org/stable/c/add1df5eba163a3a6ece11cb85890e2e410baaea\"}, {\"url\": \"https://git.kernel.org/stable/c/d5ff2fb2e7167e9483846e34148e60c0c016a1f6\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: cancel nfsd_shrinker_work using sync mode in nfs4_state_shutdown_net\\n\\nIn the normal case, when we excute `echo 0 \u003e /proc/fs/nfsd/threads`, the\\nfunction `nfs4_state_destroy_net` in `nfs4_state_shutdown_net` will\\nrelease all resources related to the hashed `nfs4_client`. If the\\n`nfsd_client_shrinker` is running concurrently, the `expire_client`\\nfunction will first unhash this client and then destroy it. This can\\nlead to the following warning. Additionally, numerous use-after-free\\nerrors may occur as well.\\n\\nnfsd_client_shrinker         echo 0 \u003e /proc/fs/nfsd/threads\\n\\nexpire_client                nfsd_shutdown_net\\n  unhash_client                ...\\n                               nfs4_state_shutdown_net\\n                                 /* won\u0027t wait shrinker exit */\\n  /*                             cancel_work(\u0026nn-\u003enfsd_shrinker_work)\\n   * nfsd_file for this          /* won\u0027t destroy unhashed client1 */\\n   * client1 still alive         nfs4_state_destroy_net\\n   */\\n\\n                               nfsd_file_cache_shutdown\\n                                 /* trigger warning */\\n                                 kmem_cache_destroy(nfsd_file_slab)\\n                                 kmem_cache_destroy(nfsd_file_mark_slab)\\n  /* release nfsd_file and mark */\\n  __destroy_client\\n\\n====================================================================\\nBUG nfsd_file (Not tainted): Objects remaining in nfsd_file on\\n__kmem_cache_shutdown()\\n--------------------------------------------------------------------\\nCPU: 4 UID: 0 PID: 764 Comm: sh Not tainted 6.12.0-rc3+ #1\\n\\n dump_stack_lvl+0x53/0x70\\n slab_err+0xb0/0xf0\\n __kmem_cache_shutdown+0x15c/0x310\\n kmem_cache_destroy+0x66/0x160\\n nfsd_file_cache_shutdown+0xac/0x210 [nfsd]\\n nfsd_destroy_serv+0x251/0x2a0 [nfsd]\\n nfsd_svc+0x125/0x1e0 [nfsd]\\n write_threads+0x16a/0x2a0 [nfsd]\\n nfsctl_transaction_write+0x74/0xa0 [nfsd]\\n vfs_write+0x1a5/0x6d0\\n ksys_write+0xc1/0x160\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n====================================================================\\nBUG nfsd_file_mark (Tainted: G    B   W         ): Objects remaining\\nnfsd_file_mark on __kmem_cache_shutdown()\\n--------------------------------------------------------------------\\n\\n dump_stack_lvl+0x53/0x70\\n slab_err+0xb0/0xf0\\n __kmem_cache_shutdown+0x15c/0x310\\n kmem_cache_destroy+0x66/0x160\\n nfsd_file_cache_shutdown+0xc8/0x210 [nfsd]\\n nfsd_destroy_serv+0x251/0x2a0 [nfsd]\\n nfsd_svc+0x125/0x1e0 [nfsd]\\n write_threads+0x16a/0x2a0 [nfsd]\\n nfsctl_transaction_write+0x74/0xa0 [nfsd]\\n vfs_write+0x1a5/0x6d0\\n ksys_write+0xc1/0x160\\n do_syscall_64+0x5f/0x170\\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\nTo resolve this issue, cancel `nfsd_shrinker_work` using synchronous\\nmode in nfs4_state_shutdown_net.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.233\", \"versionStartIncluding\": \"5.10.220\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.176\", \"versionStartIncluding\": \"5.15.154\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.123\", \"versionStartIncluding\": \"6.1.81\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.59\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.6\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"6.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:54:33.160Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50121\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:54:33.160Z\", \"dateReserved\": \"2024-10-21T19:36:19.953Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-05T17:10:50.523Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.