CVE-2022-50291 Affecting kernel-tools-devel package, versions <0:4.14.299-223.520.amzn2
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-AMZN2-KERNELTOOLSDEVEL-13450850
- published8 Oct 2025
- disclosed15 Sept 2025
Introduced: 15 Sep 2025
NewCVE-2022-50291 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2 kernel-tools-devel to version 0:4.14.299-223.520.amzn2 or higher.
This issue was patched in ALAS2-2022-1888.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-50291
- https://git.kernel.org/stable/c/12a0eb340c9a22e0f8c00d2c0c1a60695ead926a
- https://git.kernel.org/stable/c/13dba69e18d04c8eec7596369f2a0596b0260275
- https://git.kernel.org/stable/c/15e4dabda11b0fa31d510a915d1a580f47dfc92e
- https://git.kernel.org/stable/c/1b8a5692ab25db4ef1c2cc8e5d21f7a65dc3d079
- https://git.kernel.org/stable/c/342d918cf9a45df9cf11bbe7162b851adefd178f
- https://git.kernel.org/stable/c/bf46af730e58d340f6f740bc69a07c5f6b85c655
- https://git.kernel.org/stable/c/c325f92d8d9b223d5842609ca067e898e9d34566
- https://git.kernel.org/stable/c/e94395e916b48a5b912a0a04570981b5b091acb0