CVE-2024-41058

{"id": "CVE-2024-41058", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"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"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2024-07-29T15:15:13.847", "references": [{"url": "https://git.kernel.org/stable/c/38b88d544216f806d93a273a62ff8ebe82254003", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/522018a0de6b6fcce60c04f86dfc5f0e4b6a1b36", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/90f17e47f1e209c6a3c92a1d038a0a80c95c460e", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9dd7f5663899ea13a6a73216106d9c13c37453e3", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: fix slab-use-after-free in fscache_withdraw_volume()\n\nWe got the following issue in our fault injection stress test:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in fscache_withdraw_volume+0x2e1/0x370\nRead of size 4 at addr ffff88810680be08 by task ondemand-04-dae/5798\n\nCPU: 0 PID: 5798 Comm: ondemand-04-dae Not tainted 6.8.0-dirty #565\nCall Trace:\n kasan_check_range+0xf6/0x1b0\n fscache_withdraw_volume+0x2e1/0x370\n cachefiles_withdraw_volume+0x31/0x50\n cachefiles_withdraw_cache+0x3ad/0x900\n cachefiles_put_unbind_pincount+0x1f6/0x250\n cachefiles_daemon_release+0x13b/0x290\n __fput+0x204/0xa00\n task_work_run+0x139/0x230\n\nAllocated by task 5820:\n __kmalloc+0x1df/0x4b0\n fscache_alloc_volume+0x70/0x600\n __fscache_acquire_volume+0x1c/0x610\n erofs_fscache_register_volume+0x96/0x1a0\n erofs_fscache_register_fs+0x49a/0x690\n erofs_fc_fill_super+0x6c0/0xcc0\n vfs_get_super+0xa9/0x140\n vfs_get_tree+0x8e/0x300\n do_new_mount+0x28c/0x580\n [...]\n\nFreed by task 5820:\n kfree+0xf1/0x2c0\n fscache_put_volume.part.0+0x5cb/0x9e0\n erofs_fscache_unregister_fs+0x157/0x1b0\n erofs_kill_sb+0xd9/0x1c0\n deactivate_locked_super+0xa3/0x100\n vfs_get_super+0x105/0x140\n vfs_get_tree+0x8e/0x300\n do_new_mount+0x28c/0x580\n [...]\n==================================================================\n\nFollowing is the process that triggers the issue:\n\n mount failed | daemon exit\n------------------------------------------------------------\n deactivate_locked_super cachefiles_daemon_release\n erofs_kill_sb\n erofs_fscache_unregister_fs\n fscache_relinquish_volume\n __fscache_relinquish_volume\n fscache_put_volume(fscache_volume, fscache_volume_put_relinquish)\n zero = __refcount_dec_and_test(&fscache_volume->ref, &ref);\n cachefiles_put_unbind_pincount\n cachefiles_daemon_unbind\n cachefiles_withdraw_cache\n cachefiles_withdraw_volumes\n list_del_init(&volume->cache_link)\n fscache_free_volume(fscache_volume)\n cache->ops->free_volume\n cachefiles_free_volume\n list_del_init(&cachefiles_volume->cache_link);\n kfree(fscache_volume)\n cachefiles_withdraw_volume\n fscache_withdraw_volume\n fscache_volume->n_accesses\n // fscache_volume UAF !!!\n\nThe fscache_volume in cache->volumes must not have been freed yet, but its\nreference count may be 0. So use the new fscache_try_get_volume() helper\nfunction try to get its reference count.\n\nIf the reference count of fscache_volume is 0, fscache_put_volume() is\nfreeing it, so wait for it to be removed from cache->volumes.\n\nIf its reference count is not 0, call cachefiles_withdraw_volume() with\nreference count protection to avoid the above issue."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: cachefiles: fix slab-use-after-free in fscache_withdraw_volume() Obtuvimos el siguiente problema en nuestra prueba de estr\u00e9s de inyecci\u00f3n defallos: ============ ==================================================== ==== ERROR: KASAN: slab-use-after-free en fscache_withdraw_volume+0x2e1/0x370 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff88810680be08 por tarea ondemand-04-dae/5798 CPU: 0 PID: 5798 Comm: ondemand-04-dae No contaminado 6.8.0-dirty #565 Seguimiento de llamadas: kasan_check_range+0xf6/0x1b0 fscache_withdraw_volume+0x2e1/0x370 cachefiles_withdraw_volume+0x31/0x50 cachefiles_withdraw_cache+0x3ad/0x900 cachefiles_put_unbind_pincount+0x1f6/0x25 0 cachefiles_daemon_release+0x13b/0x290 __fput+0x204/0xa00 task_work_run+0x139 /0x230 Asignado por la tarea 5820: __kmalloc+0x1df/0x4b0 fscache_alloc_volume+0x70/0x600 __fscache_acquire_volume+0x1c/0x610 erofs_fscache_register_volume+0x96/0x1a0 erofs_fscache_register_fs+0x49a/0 x690 erofs_fc_fill_super+0x6c0/0xcc0 vfs_get_super+0xa9/0x140 vfs_get_tree+0x8e/0x300 do_new_mount+0x28c /0x580 [...] Liberado por la tarea 5820: kfree+0xf1/0x2c0 fscache_put_volume.part.0+0x5cb/0x9e0 erofs_fscache_unregister_fs+0x157/0x1b0 erofs_kill_sb+0xd9/0x1c0 deactivate_locked_super+0xa3/0x100 _super+0x105/0x140 vfs_get_tree+0x8e/ 0x300 do_new_mount+0x28c/0x580 [...] ======================================== =========================== El siguiente es el proceso que desencadena el problema: montaje fallido | salida del daemon ------------------------------------------------ ------------ deactivate_locked_super cachefiles_daemon_release erofs_kill_sb erofs_fscache_unregister_fs fscache_relinquish_volume __fscache_relinquish_volume fscache_put_volume(fscache_volume, fscache_volume_put_relinquish) zero = __refcount_dec_and_test(&fscache_volume->ref, &ref); cachefiles_put_unbind_pincount cachefiles_daemon_unbind cachefiles_withdraw_cache cachefiles_withdraw_volumes list_del_init(&volume->cache_link) fscache_free_volume(fscache_volume) cache->ops->free_volume cachefiles_free_volume list_del_init(&cachefiles_volume->cache_link); kfree(fscache_volume) cachefiles_withdraw_volume fscache_withdraw_volume fscache_volume->n_accesses // fscache_volume UAF !!! El fscache_volume en cache->volumes no debe haberse liberado todav\u00eda, pero su recuento de referencias puede ser 0. Por lo tanto, utilice la nueva funci\u00f3n auxiliar fscache_try_get_volume() para intentar obtener su recuento de referencias. Si el recuento de referencia de fscache_volume es 0, fscache_put_volume() lo est\u00e1 liberando, as\u00ed que espere a que se elimine de cach\u00e9->vol\u00famenes. Si su recuento de referencias no es 0, llame a cachefiles_withdraw_volume() con protecci\u00f3n de recuento de referencias para evitar el problema anterior."}], "lastModified": "2024-08-21T19:35:22.120", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DB356B3F-4040-49B4-8BB9-E2643A2E9B13", "versionEndExcluding": "6.1.101", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "972274A2-D688-4C37-BE42-689B58B4C225", "versionEndExcluding": "6.6.42", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "01E300B3-8B39-4A2D-8B03-4631433D3915", "versionEndExcluding": "6.9.11", "versionStartIncluding": "6.7"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}