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

Vulnerability from cvelistv5 – Published: 2024-09-18 07:12 – Updated: 2026-01-11 16:29
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.
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)
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    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)
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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.\"}], \"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\"}}}",
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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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