CVE-2022-50291: kcm: annotate data-races around kcm->rx_psock
In the Linux kernel, the following vulnerability has been resolved:
kcm: annotate data-races around kcm->rxpsock
kcm->rxpsock can be read locklessly in kcmrfree(). Annotate the read and writes accordingly.
We do the same for kcm->rxwait in the following patch.
syzbot reported: BUG: KCSAN: data-race in kcmrfree / unreserverxkcm
write to 0xffff888123d827b8 of 8 bytes by task 2758 on cpu 1: unreserverxkcm+0x72/0x1f0 net/kcm/kcmsock.c:313 kcmrcvstrparser+0x2b5/0x3a0 net/kcm/kcmsock.c:373 strprecv+0x64c/0xd20 net/strparser/strparser.c:301 strprecv+0x6d/0x80 net/strparser/strparser.c:335 tcpreadsock+0x13e/0x5a0 net/ipv4/tcp.c:1703 strpreadsock net/strparser/strparser.c:358 [inline] dostrpwork net/strparser/strparser.c:406 [inline] strpwork+0xe8/0x180 net/strparser/strparser.c:415 processonework+0x3d3/0x720 kernel/workqueue.c:2289 workerthread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 retfromfork+0x1f/0x30 arch/x86/entry/entry64.S:306
read to 0xffff888123d827b8 of 8 bytes by task 5859 on cpu 0: kcmrfree+0x14c/0x220 net/kcm/kcmsock.c:181 skbreleaseheadstate+0x8e/0x160 net/core/skbuff.c:841 skbreleaseall net/core/skbuff.c:852 [inline] kfreeskb net/core/skbuff.c:868 [inline] kfreeskbreason+0x5c/0x260 net/core/skbuff.c:891 kfreeskb include/linux/skbuff.h:1216 [inline] kcmrecvmsg+0x226/0x2b0 net/kcm/kcmsock.c:1161 sysrecvmsg+0x16c/0x2e0 sysrecvmsg net/socket.c:2743 [inline] dorecvmmsg+0x2f1/0x710 net/socket.c:2837 sysrecvmmsg net/socket.c:2916 [inline] dosysrecvmmsg net/socket.c:2939 [inline] sesysrecvmmsg net/socket.c:2932 [inline] x64sysrecvmmsg+0xde/0x160 net/socket.c:2932 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x2b/0x70 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+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
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2022-50291?
CVE-2022-50291 is a vulnerability in the Linux kernel related to data races in the handling of the kcm->rx_psock and kcm->rx_wait structures.
What is the severity of CVE-2022-50291?
The severity of CVE-2022-50291 has not been explicitly rated but involves critical components of the Linux kernel that can affect system stability.
How do I fix CVE-2022-50291?
To fix CVE-2022-50291, you need to update the Linux kernel to the latest patched version provided by your distribution.
What versions of the Linux kernel are affected by CVE-2022-50291?
CVE-2022-50291 affects specific versions of the Linux kernel; checking your kernel version is necessary to determine vulnerability.
Can CVE-2022-50291 lead to further exploitation?
Yes, if exploited, CVE-2022-50291 could potentially lead to unauthorized access or system instability due to data inconsistency.