CVE-2024-26951 Affecting kernel-rt-debug-core package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS9-KERNELRTDEBUGCORE-6754406
- published2 May 2024
- disclosed1 May 2024
Introduced: 1 May 2024
CVE-2024-26951 (opens in a new tab)How to fix?
There is no fixed version for Centos:9 kernel-rt-debug-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-core package and not the kernel-rt-debug-core package as distributed by Centos.
See How to fix? for Centos:9 relevant fixed versions and status.
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
References
- https://access.redhat.com/security/cve/CVE-2024-26951
- 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://lists.debian.org/debian-lts-announce/2024/06/msg00017.html