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

Vulnerability from cvelistv5 – Published: 2024-11-05 17:10 – Updated: 2025-11-03 20:43
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
CWE
Assigner
References
Impacted products
Vendor Product Version
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)
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)
Create a notification for this product.
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          "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."
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      "containers": "{\"adp\": [{\"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\"}], \"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-5f407fcff5a0\"}, \"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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-01-09T15:35:30.162Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50121\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-01-09T15:35:30.162Z\", \"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": "5.1"
    }
  }
}


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  • 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.
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  • 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.