{"id":"CVE-2024-46786","summary":"fscache: delete fscache_cookie_lru_timer when fscache exits to avoid UAF","details":"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.","modified":"2026-03-20T12:37:53.912169Z","published":"2024-09-18T07:12:42.332Z","related":["MGASA-2024-0316","MGASA-2024-0318","SUSE-SU-2024:3551-1","SUSE-SU-2024:3553-1","SUSE-SU-2024:3561-1","SUSE-SU-2024:3564-1","SUSE-SU-2024:3569-1","SUSE-SU-2024:3587-1","SUSE-SU-2024:3592-1","SUSE-SU-2025:20073-1","SUSE-SU-2025:20077-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46786.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0a11262549ac2ac6fb98c7cd40a67136817e5a52"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1fc36d5470335546c45799d94d7bb2cbc09e8b7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e0d724932ad12e3528f4ce97fc0f6078d0cce4bc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46786.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-46786"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"12bb21a29c19aae50cfad4e2bb5c943108f34a7d"},{"fixed":"c1fc36d5470335546c45799d94d7bb2cbc09e8b7"},{"fixed":"e0d724932ad12e3528f4ce97fc0f6078d0cce4bc"},{"fixed":"0a11262549ac2ac6fb98c7cd40a67136817e5a52"},{"fixed":"72a6e22c604c95ddb3b10b5d3bb85b6ff4dbc34f"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-46786.json"}}],"schema_version":"1.7.5"}