In the Linux kernel, the following vulnerability has been resolved:
net: Fix load-tearing on sk->skstamp in sockrecv_cmsgs().
KCSAN found a data race in sockrecvcmsgs() where the read access to sk->skstamp needs READONCE().
BUG: KCSAN: data-race in packetrecvmsg / packetrecvmsg
write (marked) to 0xffff88803c81f258 of 8 bytes by task 19171 on cpu 0: sockwritetimestamp include/net/sock.h:2670 [inline] sockrecvcmsgs include/net/sock.h:2722 [inline] packetrecvmsg+0xb97/0xd00 net/packet/afpacket.c:3489 sockrecvmsgnosec net/socket.c:1019 [inline] sockrecvmsg+0x11a/0x130 net/socket.c:1040 sockreaditer+0x176/0x220 net/socket.c:1118 callreaditer include/linux/fs.h:1845 [inline] newsyncread fs/readwrite.c:389 [inline] vfsread+0x5e0/0x630 fs/readwrite.c:470 ksysread+0x163/0x1a0 fs/readwrite.c:613 _dosysread fs/readwrite.c:623 [inline] _sesysread fs/readwrite.c:621 [inline] _x64sysread+0x41/0x50 fs/readwrite.c:621 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x3b/0x90 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x72/0xdc
read to 0xffff88803c81f258 of 8 bytes by task 19183 on cpu 1: sockrecvcmsgs include/net/sock.h:2721 [inline] packetrecvmsg+0xb64/0xd00 net/packet/afpacket.c:3489 sockrecvmsgnosec net/socket.c:1019 [inline] sockrecvmsg+0x11a/0x130 net/socket.c:1040 sockreaditer+0x176/0x220 net/socket.c:1118 callreaditer include/linux/fs.h:1845 [inline] newsyncread fs/readwrite.c:389 [inline] vfsread+0x5e0/0x630 fs/readwrite.c:470 ksysread+0x163/0x1a0 fs/readwrite.c:613 _dosysread fs/readwrite.c:623 [inline] _sesysread fs/readwrite.c:621 [inline] _x64sysread+0x41/0x50 fs/readwrite.c:621 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x3b/0x90 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x72/0xdc
value changed: 0xffffffffc4653600 -> 0x0000000000000000
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19183 Comm: syz-executor.5 Not tainted 6.3.0-rc7-02330-gca6270c12e20 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
{
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54218.json"
}