CVE-2022-50291

MEDIUM EPSS 4.2%
Published Sep 15, 20259mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Sep 15, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: kcm: annotate data-races around kcm->rx_psock kcm->rx_psock can be read locklessly in kcm_rfree(). Annotate the read and writes accordingly. We do the same for kcm->rx_wait in the following patch. syzbot reported: BUG: KCSAN: data-race in kcm_rfree / unreserve_rx_kcm write to 0xffff888123d827b8 of 8 bytes by task 2758 on cpu 1: unreserve_rx_kcm+0x72/0x1f0 net/kcm/kcmsock.c:313 kcm_rcv_strparser+0x2b5/0x3a0 net/kcm/kcmsock.c:373 __strp_recv+0x64c/0xd20 net/strparser/strparser.c:301 strp_recv+0x6d/0x80 net/strparser/strparser.c:335 tcp_read_sock+0x13e/0x5a0 net/ipv4/tcp.c:1703 strp_read_sock net/strparser/strparser.c:358 [inline] do_strp_work net/strparser/strparser.c:406 [inline] strp_work+0xe8/0x180 net/strparser/strparser.c:415 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 read to 0xffff888123d827b8 of 8 bytes by task 5859 on cpu 0: kcm_rfree+0x14c/0x220 net/kcm/kcmsock.c:181 skb_release_head_state+0x8e/0x160 net/core/skbuff.c:841 skb_release_all net/core/skbuff.c:852 [inline] __kfree_skb net/core/skbuff.c:868 [inline] kfree_skb_reason+0x5c/0x260 net/core/skbuff.c:891 kfree_skb include/linux/skbuff.h:1216 [inline] kcm_recvmsg+0x226/0x2b0 net/kcm/kcmsock.c:1161 ____sys_recvmsg+0x16c/0x2e0 ___sys_recvmsg net/socket.c:2743 [inline] do_recvmmsg+0x2f1/0x710 net/socket.c:2837 __sys_recvmmsg net/socket.c:2916 [inline] __do_sys_recvmmsg net/socket.c:2939 [inline] __se_sys_recvmmsg net/socket.c:2932 [inline] __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2932 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xffff88812971ce00 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 5859 Comm: syz-executor.3 Not tainted 6.0.0-syzkaller-12189-g19d17ab7c68b-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
4.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel*≥4.6  –  <4.9.332
linuxlinux_kernel*≥4.10  –  <4.14.298
linuxlinux_kernel*≥4.15  –  <4.19.264
linuxlinux_kernel*≥4.20  –  <5.4.223
linuxlinux_kernel*≥5.5  –  <5.10.153
linuxlinux_kernel*≥5.11  –  <5.15.77
linuxlinux_kernel*≥5.16  –  <6.0.7
linuxlinux_kernel6.1any
linuxlinux_kernel6.1any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/12a0eb340c9a22e0f8c00d2c0c1a60695ead926a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/13dba69e18d04c8eec7596369f2a0596b0260275
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/15e4dabda11b0fa31d510a915d1a580f47dfc92e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1b8a5692ab25db4ef1c2cc8e5d21f7a65dc3d079
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/342d918cf9a45df9cf11bbe7162b851adefd178f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf46af730e58d340f6f740bc69a07c5f6b85c655
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c325f92d8d9b223d5842609ca067e898e9d34566
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e94395e916b48a5b912a0a04570981b5b091acb0
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/12a0eb340c9a22e0f8c00d2c0c1a60695ead926a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/13dba69e18d04c8eec7596369f2a0596b0260275
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/15e4dabda11b0fa31d510a915d1a580f47dfc92e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1b8a5692ab25db4ef1c2cc8e5d21f7a65dc3d079
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/342d918cf9a45df9cf11bbe7162b851adefd178f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf46af730e58d340f6f740bc69a07c5f6b85c655
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c325f92d8d9b223d5842609ca067e898e9d34566
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e94395e916b48a5b912a0a04570981b5b091acb0
    Patch