CVE-2024-45000 (GCVE-0-2024-45000)

Vulnerability from cvelistv5 – Published: 2024-09-04 19:54 – Updated: 2026-05-11 20:33
VLAI
Title
fs/netfs/fscache_cookie: add missing "n_accesses" check
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/netfs/fscache_cookie: add missing "n_accesses" check This fixes a NULL pointer dereference bug due to a data race which looks like this: BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 33 PID: 16573 Comm: kworker/u97:799 Not tainted 6.8.7-cm4all1-hp+ #43 Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018 Workqueue: events_unbound netfs_rreq_write_to_cache_work RIP: 0010:cachefiles_prepare_write+0x30/0xa0 Code: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 <48> 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10 RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286 RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000 RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438 RBP: 0000000000000000 R08: 0000000000278333 R09: 0000000000000001 R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68 R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00 FS: 0000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0 Call Trace: <TASK> ? __die+0x1f/0x70 ? page_fault_oops+0x15d/0x440 ? search_module_extables+0xe/0x40 ? fixup_exception+0x22/0x2f0 ? exc_page_fault+0x5f/0x100 ? asm_exc_page_fault+0x22/0x30 ? cachefiles_prepare_write+0x30/0xa0 netfs_rreq_write_to_cache_work+0x135/0x2e0 process_one_work+0x137/0x2c0 worker_thread+0x2e9/0x400 ? __pfx_worker_thread+0x10/0x10 kthread+0xcc/0x100 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x30/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30 </TASK> Modules linked in: CR2: 0000000000000008 ---[ end trace 0000000000000000 ]--- This happened because fscache_cookie_state_machine() was slow and was still running while another process invoked fscache_unuse_cookie(); this led to a fscache_cookie_lru_do_one() call, setting the FSCACHE_COOKIE_DO_LRU_DISCARD flag, which was picked up by fscache_cookie_state_machine(), withdrawing the cookie via cachefiles_withdraw_cookie(), clearing cookie->cache_priv. At the same time, yet another process invoked cachefiles_prepare_write(), which found a NULL pointer in this code line: struct cachefiles_object *object = cachefiles_cres_object(cres); The next line crashes, obviously: struct cachefiles_cache *cache = object->volume->cache; During cachefiles_prepare_write(), the "n_accesses" counter is non-zero (via fscache_begin_operation()). The cookie must not be withdrawn until it drops to zero. The counter is checked by fscache_cookie_state_machine() before switching to FSCACHE_COOKIE_STATE_RELINQUISHING and FSCACHE_COOKIE_STATE_WITHDRAWING (in "case FSCACHE_COOKIE_STATE_FAILED"), but not for FSCACHE_COOKIE_STATE_LRU_DISCARDING ("case FSCACHE_COOKIE_STATE_ACTIVE"). This patch adds the missing check. With a non-zero access counter, the function returns and the next fscache_end_cookie_access() call will queue another fscache_cookie_state_machine() call to handle the still-pending FSCACHE_COOKIE_DO_LRU_DISCARD.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < b8a50877f68efdcc0be3fcc5116e00c31b90e45b (git)
Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6 (git)
Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < 0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d (git)
Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < f71aa06398aabc2e3eaac25acdf3d62e0094ba70 (git)
Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.107 , ≤ 6.1.* (semver)
Unaffected: 6.6.48 , ≤ 6.6.* (semver)
Unaffected: 6.10.7 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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                "id": "CVE-2024-45000",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/netfs/fscache_cookie: add missing \"n_accesses\" check\n\nThis fixes a NULL pointer dereference bug due to a data race which\nlooks like this:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\n  #PF: supervisor read access in kernel mode\n  #PF: error_code(0x0000) - not-present page\n  PGD 0 P4D 0\n  Oops: 0000 [#1] SMP PTI\n  CPU: 33 PID: 16573 Comm: kworker/u97:799 Not tainted 6.8.7-cm4all1-hp+ #43\n  Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018\n  Workqueue: events_unbound netfs_rreq_write_to_cache_work\n  RIP: 0010:cachefiles_prepare_write+0x30/0xa0\n  Code: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 \u003c48\u003e 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10\n  RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286\n  RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000\n  RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438\n  RBP: 0000000000000000 R08: 0000000000278333 R09: 0000000000000001\n  R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68\n  R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00\n  FS:  0000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0\n  Call Trace:\n   \u003cTASK\u003e\n   ? __die+0x1f/0x70\n   ? page_fault_oops+0x15d/0x440\n   ? search_module_extables+0xe/0x40\n   ? fixup_exception+0x22/0x2f0\n   ? exc_page_fault+0x5f/0x100\n   ? asm_exc_page_fault+0x22/0x30\n   ? cachefiles_prepare_write+0x30/0xa0\n   netfs_rreq_write_to_cache_work+0x135/0x2e0\n   process_one_work+0x137/0x2c0\n   worker_thread+0x2e9/0x400\n   ? __pfx_worker_thread+0x10/0x10\n   kthread+0xcc/0x100\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork+0x30/0x50\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork_asm+0x1b/0x30\n   \u003c/TASK\u003e\n  Modules linked in:\n  CR2: 0000000000000008\n  ---[ end trace 0000000000000000 ]---\n\nThis happened because fscache_cookie_state_machine() was slow and was\nstill running while another process invoked fscache_unuse_cookie();\nthis led to a fscache_cookie_lru_do_one() call, setting the\nFSCACHE_COOKIE_DO_LRU_DISCARD flag, which was picked up by\nfscache_cookie_state_machine(), withdrawing the cookie via\ncachefiles_withdraw_cookie(), clearing cookie-\u003ecache_priv.\n\nAt the same time, yet another process invoked\ncachefiles_prepare_write(), which found a NULL pointer in this code\nline:\n\n  struct cachefiles_object *object = cachefiles_cres_object(cres);\n\nThe next line crashes, obviously:\n\n  struct cachefiles_cache *cache = object-\u003evolume-\u003ecache;\n\nDuring cachefiles_prepare_write(), the \"n_accesses\" counter is\nnon-zero (via fscache_begin_operation()).  The cookie must not be\nwithdrawn until it drops to zero.\n\nThe counter is checked by fscache_cookie_state_machine() before\nswitching to FSCACHE_COOKIE_STATE_RELINQUISHING and\nFSCACHE_COOKIE_STATE_WITHDRAWING (in \"case\nFSCACHE_COOKIE_STATE_FAILED\"), but not for\nFSCACHE_COOKIE_STATE_LRU_DISCARDING (\"case\nFSCACHE_COOKIE_STATE_ACTIVE\").\n\nThis patch adds the missing check.  With a non-zero access counter,\nthe function returns and the next fscache_end_cookie_access() call\nwill queue another fscache_cookie_state_machine() call to handle the\nstill-pending FSCACHE_COOKIE_DO_LRU_DISCARD."
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        "dateUpdated": "2026-05-11T20:33:31.321Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b"
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          "url": "https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6"
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          "url": "https://git.kernel.org/stable/c/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d"
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        {
          "url": "https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70"
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      ],
      "title": "fs/netfs/fscache_cookie: add missing \"n_accesses\" check",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-45000",
    "datePublished": "2024-09-04T19:54:44.273Z",
    "dateReserved": "2024-08-21T05:34:56.677Z",
    "dateUpdated": "2026-05-11T20:33:31.321Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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    "epss": {
      "cve": "CVE-2024-45000",
      "date": "2026-06-07",
      "epss": "0.00024",
      "percentile": "0.071"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-45000\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-04T20:15:08.657\",\"lastModified\":\"2025-11-03T23:15:48.120\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/netfs/fscache_cookie: add missing \\\"n_accesses\\\" check\\n\\nThis fixes a NULL pointer dereference bug due to a data race which\\nlooks like this:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\\n  #PF: supervisor read access in kernel mode\\n  #PF: error_code(0x0000) - not-present page\\n  PGD 0 P4D 0\\n  Oops: 0000 [#1] SMP PTI\\n  CPU: 33 PID: 16573 Comm: kworker/u97:799 Not tainted 6.8.7-cm4all1-hp+ #43\\n  Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018\\n  Workqueue: events_unbound netfs_rreq_write_to_cache_work\\n  RIP: 0010:cachefiles_prepare_write+0x30/0xa0\\n  Code: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 \u003c48\u003e 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10\\n  RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286\\n  RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000\\n  RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438\\n  RBP: 0000000000000000 R08: 0000000000278333 R09: 0000000000000001\\n  R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68\\n  R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00\\n  FS:  0000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000\\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n  CR2: 0000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0\\n  Call Trace:\\n   \u003cTASK\u003e\\n   ? __die+0x1f/0x70\\n   ? page_fault_oops+0x15d/0x440\\n   ? search_module_extables+0xe/0x40\\n   ? fixup_exception+0x22/0x2f0\\n   ? exc_page_fault+0x5f/0x100\\n   ? asm_exc_page_fault+0x22/0x30\\n   ? cachefiles_prepare_write+0x30/0xa0\\n   netfs_rreq_write_to_cache_work+0x135/0x2e0\\n   process_one_work+0x137/0x2c0\\n   worker_thread+0x2e9/0x400\\n   ? __pfx_worker_thread+0x10/0x10\\n   kthread+0xcc/0x100\\n   ? __pfx_kthread+0x10/0x10\\n   ret_from_fork+0x30/0x50\\n   ? __pfx_kthread+0x10/0x10\\n   ret_from_fork_asm+0x1b/0x30\\n   \u003c/TASK\u003e\\n  Modules linked in:\\n  CR2: 0000000000000008\\n  ---[ end trace 0000000000000000 ]---\\n\\nThis happened because fscache_cookie_state_machine() was slow and was\\nstill running while another process invoked fscache_unuse_cookie();\\nthis led to a fscache_cookie_lru_do_one() call, setting the\\nFSCACHE_COOKIE_DO_LRU_DISCARD flag, which was picked up by\\nfscache_cookie_state_machine(), withdrawing the cookie via\\ncachefiles_withdraw_cookie(), clearing cookie-\u003ecache_priv.\\n\\nAt the same time, yet another process invoked\\ncachefiles_prepare_write(), which found a NULL pointer in this code\\nline:\\n\\n  struct cachefiles_object *object = cachefiles_cres_object(cres);\\n\\nThe next line crashes, obviously:\\n\\n  struct cachefiles_cache *cache = object-\u003evolume-\u003ecache;\\n\\nDuring cachefiles_prepare_write(), the \\\"n_accesses\\\" counter is\\nnon-zero (via fscache_begin_operation()).  The cookie must not be\\nwithdrawn until it drops to zero.\\n\\nThe counter is checked by fscache_cookie_state_machine() before\\nswitching to FSCACHE_COOKIE_STATE_RELINQUISHING and\\nFSCACHE_COOKIE_STATE_WITHDRAWING (in \\\"case\\nFSCACHE_COOKIE_STATE_FAILED\\\"), but not for\\nFSCACHE_COOKIE_STATE_LRU_DISCARDING (\\\"case\\nFSCACHE_COOKIE_STATE_ACTIVE\\\").\\n\\nThis patch adds the missing check.  With a non-zero access counter,\\nthe function returns and the next fscache_end_cookie_access() call\\nwill queue another fscache_cookie_state_machine() call to handle the\\nstill-pending FSCACHE_COOKIE_DO_LRU_DISCARD.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs/netfs/fscache_cookie: agregar comprobaci\u00f3n \\\"n_accesses\\\" faltante Esto corrige un error de desreferencia de puntero NULL debido a una ejecuci\u00f3n de datos que se ve as\u00ed: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000008 #PF: acceso de lectura de supervisor en modo kernel #PF: error_code(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 33 PID: 16573 Comm: kworker/u97:799 No contaminado 6.8.7-cm4all1-hp+ #43 Nombre del hardware: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 17/10/2018 Cola de trabajo: events_unbound netfs_rreq_write_to_cache_work RIP: 0010:cachefiles_prepare_write+0x30/0xa0 C\u00f3digo: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 \u0026lt;48\u0026gt; 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10 RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286 RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000 RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438 RBP: 000000000000000 R08: 0000000000278333 R09: 0000000000000001 R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68 R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00 FS: 000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0 Seguimiento de llamadas:  ? __die+0x1f/0x70 ? page_fault_oops+0x15d/0x440 ? search_module_extables+0xe/0x40 ? fixup_exception+0x22/0x2f0 ? exc_page_fault+0x5f/0x100 ? asm_exc_page_fault+0x22/0x30 ? cachefiles_prepare_write+0x30/0xa0 netfs_rreq_write_to_cache_work+0x135/0x2e0 process_one_work+0x137/0x2c0 subproceso_trabajador+0x2e9/0x400 ? __pfx_worker_thread+0x10/0x10 kthread+0xcc/0x100 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x30/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1b/0x30  M\u00f3dulos vinculados en: CR2: 000000000000008 ---[ fin del seguimiento 000000000000000 ]--- Esto sucedi\u00f3 porque fscache_cookie_state_machine() era lento y todav\u00eda se estaba ejecutando mientras otro proceso invocaba fscache_unuse_cookie(); Esto llev\u00f3 a una llamada a fscache_cookie_lru_do_one(), que estableci\u00f3 el indicador FSCACHE_COOKIE_DO_LRU_DISCARD, que fue detectado por fscache_cookie_state_machine(), retirando la cookie a trav\u00e9s de cachefiles_withdraw_cookie(), borrando cookie-\u0026gt;cache_priv. Al mismo tiempo, otro proceso invoc\u00f3 cachefiles_prepare_write(), que encontr\u00f3 un puntero NULL en esta l\u00ednea de c\u00f3digo: struct cachefiles_object *object = cachefiles_cres_object(cres); La siguiente l\u00ednea falla, obviamente: struct cachefiles_cache *cache = object-\u0026gt;volume-\u0026gt;cache; Durante cachefiles_prepare_write(), el contador \\\"n_accesses\\\" no es cero (a trav\u00e9s de fscache_begin_operation()). La cookie no debe retirarse hasta que baje a cero. El contador se comprueba mediante fscache_cookie_state_machine() antes de cambiar a FSCACHE_COOKIE_STATE_RELINQUISHING y FSCACHE_COOKIE_STATE_WITHDRAWING (en el \\\"caso FSCACHE_COOKIE_STATE_FAILED\\\"), pero no para FSCACHE_COOKIE_STATE_LRU_DISCARDING (\\\"caso FSCACHE_COOKIE_STATE_ACTIVE\\\"). Este parche agrega la comprobaci\u00f3n faltante. Con un contador de acceso distinto de cero, la funci\u00f3n retorna y la siguiente llamada fscache_end_cookie_access() pondr\u00e1 en cola otra llamada fscache_cookie_state_machine() para manejar la FSCACHE_COOKIE_DO_LRU_DISCARD a\u00fan pendiente.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"6.1.107\",\"matchCriteriaId\":\"E1FCBB3B-3EA3-4D99-B4C1-E8EA9F3DA097\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.48\",\"matchCriteriaId\":\"9DE9201A-CE6B-4726-BABB-8265EA0F8AE4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.7\",\"matchCriteriaId\":\"D2AFDFD1-D95A-4EB7-843B-5E7659518B67\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B3CE743-2126-47A3-8B7C-822B502CF119\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4DEB27E7-30AA-45CC-8934-B89263EF3551\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0005AEF-856E-47EB-BFE4-90C46899394D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:14:58.570Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-45000\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-04T20:18:51.783797Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-04T20:18:55.865Z\"}}], \"cna\": {\"title\": \"fs/netfs/fscache_cookie: add missing \\\"n_accesses\\\" check\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"b8a50877f68efdcc0be3fcc5116e00c31b90e45b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"f71aa06398aabc2e3eaac25acdf3d62e0094ba70\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/netfs/fscache_cookie.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.107\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.48\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/netfs/fscache_cookie.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b\"}, {\"url\": \"https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6\"}, {\"url\": \"https://git.kernel.org/stable/c/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d\"}, {\"url\": \"https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/netfs/fscache_cookie: add missing \\\"n_accesses\\\" check\\n\\nThis fixes a NULL pointer dereference bug due to a data race which\\nlooks like this:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000008\\n  #PF: supervisor read access in kernel mode\\n  #PF: error_code(0x0000) - not-present page\\n  PGD 0 P4D 0\\n  Oops: 0000 [#1] SMP PTI\\n  CPU: 33 PID: 16573 Comm: kworker/u97:799 Not tainted 6.8.7-cm4all1-hp+ #43\\n  Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018\\n  Workqueue: events_unbound netfs_rreq_write_to_cache_work\\n  RIP: 0010:cachefiles_prepare_write+0x30/0xa0\\n  Code: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 \u003c48\u003e 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10\\n  RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286\\n  RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000\\n  RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438\\n  RBP: 0000000000000000 R08: 0000000000278333 R09: 0000000000000001\\n  R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68\\n  R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00\\n  FS:  0000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000\\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n  CR2: 0000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0\\n  Call Trace:\\n   \u003cTASK\u003e\\n   ? __die+0x1f/0x70\\n   ? page_fault_oops+0x15d/0x440\\n   ? search_module_extables+0xe/0x40\\n   ? fixup_exception+0x22/0x2f0\\n   ? exc_page_fault+0x5f/0x100\\n   ? asm_exc_page_fault+0x22/0x30\\n   ? cachefiles_prepare_write+0x30/0xa0\\n   netfs_rreq_write_to_cache_work+0x135/0x2e0\\n   process_one_work+0x137/0x2c0\\n   worker_thread+0x2e9/0x400\\n   ? __pfx_worker_thread+0x10/0x10\\n   kthread+0xcc/0x100\\n   ? __pfx_kthread+0x10/0x10\\n   ret_from_fork+0x30/0x50\\n   ? __pfx_kthread+0x10/0x10\\n   ret_from_fork_asm+0x1b/0x30\\n   \u003c/TASK\u003e\\n  Modules linked in:\\n  CR2: 0000000000000008\\n  ---[ end trace 0000000000000000 ]---\\n\\nThis happened because fscache_cookie_state_machine() was slow and was\\nstill running while another process invoked fscache_unuse_cookie();\\nthis led to a fscache_cookie_lru_do_one() call, setting the\\nFSCACHE_COOKIE_DO_LRU_DISCARD flag, which was picked up by\\nfscache_cookie_state_machine(), withdrawing the cookie via\\ncachefiles_withdraw_cookie(), clearing cookie-\u003ecache_priv.\\n\\nAt the same time, yet another process invoked\\ncachefiles_prepare_write(), which found a NULL pointer in this code\\nline:\\n\\n  struct cachefiles_object *object = cachefiles_cres_object(cres);\\n\\nThe next line crashes, obviously:\\n\\n  struct cachefiles_cache *cache = object-\u003evolume-\u003ecache;\\n\\nDuring cachefiles_prepare_write(), the \\\"n_accesses\\\" counter is\\nnon-zero (via fscache_begin_operation()).  The cookie must not be\\nwithdrawn until it drops to zero.\\n\\nThe counter is checked by fscache_cookie_state_machine() before\\nswitching to FSCACHE_COOKIE_STATE_RELINQUISHING and\\nFSCACHE_COOKIE_STATE_WITHDRAWING (in \\\"case\\nFSCACHE_COOKIE_STATE_FAILED\\\"), but not for\\nFSCACHE_COOKIE_STATE_LRU_DISCARDING (\\\"case\\nFSCACHE_COOKIE_STATE_ACTIVE\\\").\\n\\nThis patch adds the missing check.  With a non-zero access counter,\\nthe function returns and the next fscache_end_cookie_access() call\\nwill queue another fscache_cookie_state_machine() call to handle the\\nstill-pending FSCACHE_COOKIE_DO_LRU_DISCARD.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.107\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.48\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.7\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T09:30:45.548Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-45000\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T22:14:58.570Z\", \"dateReserved\": \"2024-08-21T05:34:56.677Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-04T19:54:44.273Z\", \"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.