CVE-2022-48751
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-48751
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48751.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2022-48751
- Downstream
- Related
- Published
- 2024-06-20T12:15:13Z
- Modified
- 2025-08-09T19:01:27Z
- Severity
-
- 4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
net/smc: Transitional solution for clcsock race issue
We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released.
BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smcsetsockopt+0x59/0x280 [smc] Call Trace: <TASK> _syssetsockopt+0xfc/0x190 _x64syssetsockopt+0x20/0x30 dosyscall64+0x34/0x90 entrySYSCALL64after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e </TASK>
This patch tries to fix it by holding clcsockreleaselock and checking whether clcsock has already been released before access.
In case that a crash of the same reason happens in smcgetsockopt() or smcswitchtofallback(), this patch also checkes smc->clcsock in them too. And the caller of smcswitchto_fallback() will identify whether fallback succeeds according to the return value.
- References