{"id":"CVE-2026-97583","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Clear stale peer app data after address list changes\n\nafs_fs_probe_fileserver() fetches the current endpoint state under\nserver->fs_lock, but leaves old_alist as N…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Clear stale peer app data after address list changes\n\nafs_fs_probe_fileserver() fetches the current endpoint state under\nserver->fs_lock, but leaves old_alist as N…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 39ba6af83a7f9dee3e6a7916f41a48bcbda54eba < 3afb988fd0411707bdafb9b321086fff0da28aae","Linux >= 40e8b52fe8c8ab6920ea5f59c5469b6918cce624 < c7f77a11a1e719192c7262aad38a3919aec62c21","Linux >= 40e8b52fe8c8ab6920ea5f59c5469b6918cce624 < 7f7f5589d048821dea316cbac9b37d27eaf7530e","Linux >= 40e8b52fe8c8ab6920ea5f59c5469b6918cce624 < ba0623fc19a424f4745394c499f9f28a8d88d397","Linux >= 6.12.101 < 6.12.111","Linux 6.15"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T15:18:00.290","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97583","references":[{"url":"https://git.kernel.org/stable/c/3afb988fd0411707bdafb9b321086fff0da28aae","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7f7f5589d048821dea316cbac9b37d27eaf7530e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ba0623fc19a424f4745394c499f9f28a8d88d397","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c7f77a11a1e719192c7262aad38a3919aec62c21","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.907Z","slug":"CVE-2026-97583","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nafs: Clear stale peer app data after address list changes\n\nafs_fs_probe_fileserver() fetches the current endpoint state under\nserver->fs_lock, but leaves old_alist as NULL.  Consequently,\nafs_set_peer_appdata() treats every address list replacement as initial\nsetup and only binds the new peers; it never unbinds peers removed from\nthe old list.\n\nAn address refresh can therefore proceed as follows.  CPU 0 replaces\nserver S's list and drops Pold without clearing Pold->app_data.  The\nserver destroyer then clears only S's current peers and lets S reach its\nRCU callback.  After the callback frees S, CPU 1 handles a callback\nthrough an RxRPC connection that still pins Pold, reads Pold->app_data,\nand calls afs_use_server() on the freed object.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0\n  Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74\n  Call Trace:\n   afs_find_server+0x3c/0xa0\n   afs_rx_new_call+0x15c/0x390\n   rxrpc_new_incoming_call+0x97c/0x1730\n   rxrpc_input_packet.constprop.0+0xd03/0xec0\n   rxrpc_io_thread+0x967/0x1640\n  Allocated by task 93:\n   afs_lookup_server+0x1a7/0x14c0\n   afs_alloc_server_list+0x43f/0xb60\n   afs_create_volume+0x923/0x1490\n   afs_get_tree+0x1c6/0x10a0\n  Freed by task 0:\n   kfree+0x131/0x3c0\n   rcu_core+0x50a/0x1850\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0+0x71/0xa10\n   afs_put_server+0x213/0x2b0\n\nPreserve old->addresses for the peer app-data update so that removed\npeers are cleared before the endpoint state is replaced.  Also advance\nboth cursors when the old and new lists share a peer; activating the\nold/new comparison without this would otherwise loop forever on the\nshared entry.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210974,"id":"CVE-2026-97583","ts":1790349120341,"field":"cvss","old":null,"new":"7.5"},{"seq":210973,"id":"CVE-2026-97583","ts":1790349120341,"field":"severity","old":"none","new":"high"}]}