CVE-2024-46786 (GCVE-0-2024-46786)

Vulnerability from cvelistv5 – Published: 2024-09-18 07:12 – Updated: 2026-05-11 20:36
VLAI
Title
fscache: delete fscache_cookie_lru_timer when fscache exits to avoid UAF
Summary
In the Linux kernel, the following vulnerability has been resolved: fscache: delete fscache_cookie_lru_timer when fscache exits to avoid UAF The fscache_cookie_lru_timer is initialized when the fscache module is inserted, but is not deleted when the fscache module is removed. If timer_reduce() is called before removing the fscache module, the fscache_cookie_lru_timer will be added to the timer list of the current cpu. Afterwards, a use-after-free will be triggered in the softIRQ after removing the fscache module, as follows: ================================================================== BUG: unable to handle page fault for address: fffffbfff803c9e9 PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 21ffea067 P4D 21ffea067 PUD 21ffe6067 PMD 110a7c067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G W 6.11.0-rc3 #855 Tainted: [W]=WARN RIP: 0010:__run_timer_base.part.0+0x254/0x8a0 Call Trace: <IRQ> tmigr_handle_remote_up+0x627/0x810 __walk_groups.isra.0+0x47/0x140 tmigr_handle_remote+0x1fa/0x2f0 handle_softirqs+0x180/0x590 irq_exit_rcu+0x84/0xb0 sysvec_apic_timer_interrupt+0x6e/0x90 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:default_idle+0xf/0x20 default_idle_call+0x38/0x60 do_idle+0x2b5/0x300 cpu_startup_entry+0x54/0x60 start_secondary+0x20d/0x280 common_startup_64+0x13e/0x148 </TASK> Modules linked in: [last unloaded: netfs] ================================================================== Therefore delete fscache_cookie_lru_timer when removing the fscahe module.
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 , < c1fc36d5470335546c45799d94d7bb2cbc09e8b7 (git)
Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < e0d724932ad12e3528f4ce97fc0f6078d0cce4bc (git)
Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < 0a11262549ac2ac6fb98c7cd40a67136817e5a52 (git)
Affected: 12bb21a29c19aae50cfad4e2bb5c943108f34a7d , < 72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f (git)
Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.51 , ≤ 6.6.* (semver)
Unaffected: 6.10.10 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Afterwards, a use-after-free will be triggered\\nin the softIRQ after removing the fscache module, as follows:\\n\\n==================================================================\\nBUG: unable to handle page fault for address: fffffbfff803c9e9\\n PF: supervisor read access in kernel mode\\n PF: error_code(0x0000) - not-present page\\nPGD 21ffea067 P4D 21ffea067 PUD 21ffe6067 PMD 110a7c067 PTE 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\\nCPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G W 6.11.0-rc3 #855\\nTainted: [W]=WARN\\nRIP: 0010:__run_timer_base.part.0+0x254/0x8a0\\nCall Trace:\\n \u003cIRQ\u003e\\n tmigr_handle_remote_up+0x627/0x810\\n __walk_groups.isra.0+0x47/0x140\\n tmigr_handle_remote+0x1fa/0x2f0\\n handle_softirqs+0x180/0x590\\n irq_exit_rcu+0x84/0xb0\\n sysvec_apic_timer_interrupt+0x6e/0x90\\n \u003c/IRQ\u003e\\n \u003cTASK\u003e\\n asm_sysvec_apic_timer_interrupt+0x1a/0x20\\nRIP: 0010:default_idle+0xf/0x20\\n default_idle_call+0x38/0x60\\n do_idle+0x2b5/0x300\\n cpu_startup_entry+0x54/0x60\\n start_secondary+0x20d/0x280\\n common_startup_64+0x13e/0x148\\n \u003c/TASK\u003e\\nModules linked in: [last unloaded: netfs]\\n==================================================================\\n\\nTherefore delete fscache_cookie_lru_timer when removing the fscahe module.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fscache: eliminar fscache_cookie_lru_timer cuando fscache sale para evitar UAF fscache_cookie_lru_timer se inicializa cuando se inserta el m\u00f3dulo fscache, pero no se elimina cuando se elimina el m\u00f3dulo fscache. Si se llama a timer_reduce() antes de eliminar el m\u00f3dulo fscache, fscache_cookie_lru_timer se agregar\u00e1 a la lista de temporizadores de la CPU actual. Posteriormente, se activar\u00e1 un use after free en el softIRQ despu\u00e9s de quitar el m\u00f3dulo fscache, de la siguiente manera: ======================================================================== ERROR: no se puede manejar el error de p\u00e1gina para la direcci\u00f3n: fffffbfff803c9e9 PF: acceso de lectura del supervisor en modo kernel PF: error_code(0x0000) - p\u00e1gina no presente PGD 21ffea067 P4D 21ffea067 PUD 21ffe6067 PMD 110a7c067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Contaminado: GW 6.11.0-rc3 #855 Contaminado: [W]=ADVERTENCIA RIP: 0010:__run_timer_base.part.0+0x254/0x8a0 Rastreo de llamadas:  tmigr_handle_remote_up+0x627/0x810 __walk_groups.isra.0+0x47/0x140 tmigr_handle_remote+0x1fa/0x2f0 handle_softirqs+0x180/0x590 irq_exit_rcu+0x84/0xb0 sysvec_apic_timer_interrupt+0x6e/0x90   asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:default_idle+0xf/0x20 default_idle_call+0x38/0x60 do_idle+0x2b5/0x300 cpu_startup_entry+0x54/0x60 start_secondary+0x20d/0x280 common_startup_64+0x13e/0x148  M\u00f3dulos vinculados en: [\u00faltima descarga: netfs] ======================================================================= Por lo tanto, elimine fscache_cookie_lru_timer al eliminar el m\u00f3dulo fscahe.\"}],\"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:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"6.1.160\",\"matchCriteriaId\":\"5CE38853-32F1-4005-A349-4C2BD7E30A83\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.51\",\"matchCriteriaId\":\"E4529134-BAC4-4776-840B-304009E181A0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.10\",\"matchCriteriaId\":\"ACDEE48C-137A-4731-90D0-A675865E1BED\"},{\"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\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"39889A68-6D34-47A6-82FC-CD0BF23D6754\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"B8383ABF-1457-401F-9B61-EE50F4C61F4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"B77A9280-37E6-49AD-B559-5B23A3B1DC3D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a11262549ac2ac6fb98c7cd40a67136817e5a52\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c1fc36d5470335546c45799d94d7bb2cbc09e8b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e0d724932ad12e3528f4ce97fc0f6078d0cce4bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-46786\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-29T14:29:09.431104Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-29T14:29:13.542Z\"}}], \"cna\": {\"title\": \"fscache: delete fscache_cookie_lru_timer when fscache exits to avoid UAF\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"c1fc36d5470335546c45799d94d7bb2cbc09e8b7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"e0d724932ad12e3528f4ce97fc0f6078d0cce4bc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"0a11262549ac2ac6fb98c7cd40a67136817e5a52\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"12bb21a29c19aae50cfad4e2bb5c943108f34a7d\", \"lessThan\": \"72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/netfs/fscache_main.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\": \"6.1.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.51\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/netfs/fscache_main.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/c1fc36d5470335546c45799d94d7bb2cbc09e8b7\"}, {\"url\": \"https://git.kernel.org/stable/c/e0d724932ad12e3528f4ce97fc0f6078d0cce4bc\"}, {\"url\": \"https://git.kernel.org/stable/c/0a11262549ac2ac6fb98c7cd40a67136817e5a52\"}, {\"url\": \"https://git.kernel.org/stable/c/72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfscache: delete fscache_cookie_lru_timer when fscache exits to avoid UAF\\n\\nThe fscache_cookie_lru_timer is initialized when the fscache module\\nis inserted, but is not deleted when the fscache module is removed.\\nIf timer_reduce() is called before removing the fscache module,\\nthe fscache_cookie_lru_timer will be added to the timer list of\\nthe current cpu. Afterwards, a use-after-free will be triggered\\nin the softIRQ after removing the fscache module, as follows:\\n\\n==================================================================\\nBUG: unable to handle page fault for address: fffffbfff803c9e9\\n PF: supervisor read access in kernel mode\\n PF: error_code(0x0000) - not-present page\\nPGD 21ffea067 P4D 21ffea067 PUD 21ffe6067 PMD 110a7c067 PTE 0\\nOops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI\\nCPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G W 6.11.0-rc3 #855\\nTainted: [W]=WARN\\nRIP: 0010:__run_timer_base.part.0+0x254/0x8a0\\nCall Trace:\\n \u003cIRQ\u003e\\n tmigr_handle_remote_up+0x627/0x810\\n __walk_groups.isra.0+0x47/0x140\\n tmigr_handle_remote+0x1fa/0x2f0\\n handle_softirqs+0x180/0x590\\n irq_exit_rcu+0x84/0xb0\\n sysvec_apic_timer_interrupt+0x6e/0x90\\n \u003c/IRQ\u003e\\n \u003cTASK\u003e\\n asm_sysvec_apic_timer_interrupt+0x1a/0x20\\nRIP: 0010:default_idle+0xf/0x20\\n default_idle_call+0x38/0x60\\n do_idle+0x2b5/0x300\\n cpu_startup_entry+0x54/0x60\\n start_secondary+0x20d/0x280\\n common_startup_64+0x13e/0x148\\n \u003c/TASK\u003e\\nModules linked in: [last unloaded: netfs]\\n==================================================================\\n\\nTherefore delete fscache_cookie_lru_timer when removing the fscahe module.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.51\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.10\", \"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\": \"2026-01-11T16:29:03.457Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-46786\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-11T16:29:03.457Z\", \"dateReserved\": \"2024-09-11T15:12:18.277Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-18T07:12:42.332Z\", \"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.