CVE-2024-26951
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- CVE-2024-26951
CVE Details
| Release Date: | 2024-05-01 |
Description
In the Linux kernel, the following vulnerability has been resolved: wireguard: netlink: check for dangling peer via is_dead instead of empty list If all peers are removed via wg_peer_remove_all(), rather than setting peer_list to empty, the peer is added to a temporary list with a head on the stack of wg_peer_remove_all(). If a netlink dump is resumed and the cursored peer is one that has been removed via wg_peer_remove_all(), it will iterate from that peer and then attempt to dump freed peers. Fix this by instead checking peer->is_dead, which was explictly created for this purpose. Also move up the device_update_lock lockdep assertion, since reading is_dead relies on that. It can be reproduced by a small script like: echo 'Setting config...' ip link add dev wg0 type wireguard wg setconf wg0 /big-config ( while true; do echo 'Showing config...' wg showconf wg0 > /dev/null done ) & sleep 4 wg setconf wg0 <(printf '[Peer]\ PublicKey=\ ') Resulting in: BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20 Read of size 8 at addr ffff88811956ec70 by task wg/59 CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5 Call Trace:
See more information about CVE-2024-26951 from MITRE CVE dictionary and NIST NVD
CVSS Scoring
NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.
| Base Score: | 5.5 | CVSS Vector: | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector: | Local network | Attack Complexity: | Low |
| Privileges Required: | Low | User Interaction: | None |
| Scope: | Unchanged | Confidentiality Impact: | None |
| Integrity Impact: | None | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (kernel-uek) | ELSA-2024-12813 | 2024-11-12 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2024-12813 | 2024-11-12 |
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