CVE-2024-26951: wireguard: netlink: check for dangling peer via is_dead instead of empty list
First published: Wed May 01 2024(Updated: )
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]\nPublicKey=$(wg genkey)\n") 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: <TASK> dump_stack_lvl+0x47/0x70 print_address_description.constprop.0+0x2c/0x380 print_report+0xab/0x250 kasan_report+0xba/0xf0 __lock_acquire+0x182a/0x1b20 lock_acquire+0x191/0x4b0 down_read+0x80/0x440 get_peer+0x140/0xcb0 wg_get_device_dump+0x471/0x1130
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.10.215 | 5.10.215 |
| redhat/kernel | <5.15.154 | 5.15.154 |
| redhat/kernel | <6.1.84 | 6.1.84 |
| redhat/kernel | <6.6.24 | 6.6.24 |
| redhat/kernel | <6.7.12 | 6.7.12 |
| redhat/kernel | <6.8.3 | 6.8.3 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04
- https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d
- https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4
- https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87
- https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b
- https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac
- https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a
- https://launchpad.net/bugs/cve/CVE-2024-26951
- https://access.redhat.com/security/cve/CVE-2024-26951
- https://lore.kernel.org/linux-cve-announce/2024050127-CVE-2024-26951-5cbe@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2278198
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2278197
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26951
- https://nvd.nist.gov/vuln/detail/CVE-2024-26951
- https://security-tracker.debian.org/tracker/CVE-2024-26951
- https://ubuntu.com/security/CVE-2024-26951
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://git.kernel.org/linus/55b6c738673871c9b0edae05d0c97995c1ff08c4
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