{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "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."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/cachefiles/cache.c",
                  "include/trace/events/fscache.h"
               ],
               "versions": [
                  {
                     "version": "fe2140e2f57f",
                     "lessThan": "90f17e47f1e2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fe2140e2f57f",
                     "lessThan": "9dd7f5663899",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fe2140e2f57f",
                     "lessThan": "38b88d544216",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "fe2140e2f57f",
                     "lessThan": "522018a0de6b",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/cachefiles/cache.c",
                  "include/trace/events/fscache.h"
               ],
               "versions": [
                  {
                     "version": "5.17",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.17",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.101",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.42",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9.11",
                     "lessThanOrEqual": "6.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/90f17e47f1e209c6a3c92a1d038a0a80c95c460e"
            },
            {
               "url": "https://git.kernel.org/stable/c/9dd7f5663899ea13a6a73216106d9c13c37453e3"
            },
            {
               "url": "https://git.kernel.org/stable/c/38b88d544216f806d93a273a62ff8ebe82254003"
            },
            {
               "url": "https://git.kernel.org/stable/c/522018a0de6b6fcce60c04f86dfc5f0e4b6a1b36"
            }
         ],
         "title": "cachefiles: fix slab-use-after-free in fscache_withdraw_volume()",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-41058",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}