CVE-2026-97583
Received Received - Intake

Use-After-Free in Linux Kernel AFS Filesystem

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: afs: Clear stale peer app data after address list changes afs_fs_probe_fileserver() fetches the current endpoint state under server->fs_lock, but leaves old_alist as NULL. Consequently, afs_set_peer_appdata() treats every address list replacement as initial setup and only binds the new peers; it never unbinds peers removed from the old list. An address refresh can therefore proceed as follows. CPU 0 replaces server S's list and drops Pold without clearing Pold->app_data. The server destroyer then clears only S's current peers and lets S reach its RCU callback. After the callback frees S, CPU 1 handles a callback through an RxRPC connection that still pins Pold, reads Pold->app_data, and calls afs_use_server() on the freed object. KASAN reported: BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0 Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74 Call Trace: afs_find_server+0x3c/0xa0 afs_rx_new_call+0x15c/0x390 rxrpc_new_incoming_call+0x97c/0x1730 rxrpc_input_packet.constprop.0+0xd03/0xec0 rxrpc_io_thread+0x967/0x1640 Allocated by task 93: afs_lookup_server+0x1a7/0x14c0 afs_alloc_server_list+0x43f/0xb60 afs_create_volume+0x923/0x1490 afs_get_tree+0x1c6/0x10a0 Freed by task 0: kfree+0x131/0x3c0 rcu_core+0x50a/0x1850 Last potentially related work creation: __call_rcu_common.constprop.0+0x71/0xa10 afs_put_server+0x213/0x2b0 Preserve old->addresses for the peer app-data update so that removed peers are cleared before the endpoint state is replaced. Also advance both cursors when the old and new lists share a peer; activating the old/new comparison without this would otherwise loop forever on the shared entry.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-97583
EUVD
EUVD-2026-86891

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability in the Linux kernel involves a use-after-free issue in the AFS (Andrew File System) module. When server address lists are updated, stale peer application data is not properly cleared, leading to a situation where freed memory is accessed. This can cause system crashes or potential code execution exploits.

Detection Guidance

This vulnerability is specific to the Linux kernel's AFS (Andrew File System) implementation and may not have direct network detection commands. Monitor kernel logs for slab-use-after-free errors or KASAN reports related to afs_find_server or afs_rx_new_call. Check for crashes in rxrpc or afs kernel threads.

Impact Analysis

If exploited, this vulnerability could allow an attacker to crash the system or execute arbitrary code with kernel privileges. It primarily affects systems using the AFS filesystem and could lead to denial-of-service conditions or further system compromise.

Mitigation Strategies

Apply the latest Linux kernel security patches that address this issue. If immediate patching is not possible, consider disabling the AFS filesystem module (afs) if not in use. Monitor for crashes or memory corruption in kernel logs.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-97583. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart