CVE-2022-48751
net/smc: Transitional solution for clcsock race issue
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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: error_code(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:smc_setsockopt+0x59/0x280 [smc] Call Trace: <TASK> __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e </TASK> This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access. In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium4.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 – < 38f0bdd548fd2ef5d481b88d8a2bfef968452e34
- affected fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 – < 4284225cd8001e134f5cf533a7cd244bbb654d0f
- affected fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 – < c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760
- affected d1d004585b40c212b338fc8a40cbaaf230ea4703
- affected 4.19.299 – < 4.20
- affected 5.1
- unaffected < 5.1
- unaffected 5.15.19 – ≤ 5.15.*
- unaffected 5.16.5 – ≤ 5.16.*
- unaffected 5.17 – ≤ *
References (3)
- https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-48751)Record last updated .