CVE-2022-49814

MEDIUM EPSS 2.8%

Published May 1, 20251y ago · Modified Jun 17, 20261w ago

4.7 CVSS 3.1

Medium

Published May 1, 2025 1y ago

Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: kcm: close race conditions on sk_receive_queue sk->sk_receive_queue is protected by skb queue lock, but for KCM sockets its RX path takes mux->rx_lock to protect more than just skb queue. However, kcm_recvmsg() still only grabs the skb queue lock, so race conditions still exist. We can teach kcm_recvmsg() to grab mux->rx_lock too but this would introduce a potential performance regression as struct kcm_mux can be shared by multiple KCM sockets. So we have to enforce skb queue lock in requeue_rx_msgs() and handle skb peek case carefully in kcm_wait_data(). Fortunately, skb_recv_datagram() already handles it nicely and is widely used by other sockets, we can just switch to skb_recv_datagram() after getting rid of the unnecessary sock lock in kcm_recvmsg() and kcm_splice_read(). Side note: SOCK_DONE is not used by KCM sockets, so it is safe to get rid of this check too. I ran the original syzbot reproducer for 30 min without seeing any issue.

CVSS Details

Base Score

4.7

Exploitability

1.0

Impact

3.6

Vector string

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector Local

Attack Complexity High

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

2.8% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Weaknesses 1

CWE-362

Affected Products 11

Vendor	Product	Version	Range
linux	linux_kernel	*	≥4.6 – <4.14.300
linux	linux_kernel	*	≥4.15 – <4.19.267
linux	linux_kernel	*	≥4.20 – <5.4.225
linux	linux_kernel	*	≥5.5 – <5.10.156
linux	linux_kernel	*	≥5.11 – <5.15.80
linux	linux_kernel	*	≥5.16 – <6.0.10
linux	linux_kernel	6.1	any
linux	linux_kernel	6.1	any
linux	linux_kernel	6.1	any
linux	linux_kernel	6.1	any
linux	linux_kernel	6.1	any

References 7

git.kernel.org https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259

Patch
git.kernel.org https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a

Patch
git.kernel.org https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221

Patch
git.kernel.org https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020

Patch
git.kernel.org https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7

Patch
git.kernel.org https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931

Patch
git.kernel.org https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3

Patch

Remediation

git.kernel.org https://git.kernel.org/stable/c/22f6b5d47396b4287662668ee3f5c1f766cb4259

Patch
git.kernel.org https://git.kernel.org/stable/c/4154b6afa2bd639214ff259d912faad984f7413a

Patch
git.kernel.org https://git.kernel.org/stable/c/5121197ecc5db58c07da95eb1ff82b98b121a221

Patch
git.kernel.org https://git.kernel.org/stable/c/bf92e54597d842da127c59833b365d6faeeaf020

Patch
git.kernel.org https://git.kernel.org/stable/c/ce57d6474ae999a3b2d442314087473a646a65c7

Patch
git.kernel.org https://git.kernel.org/stable/c/d9ad4de92e184b19bcae4da10dac0275abf83931

Patch
git.kernel.org https://git.kernel.org/stable/c/f7b0e95071bb4be4b811af3f0bfc3e200eedeaa3

Patch