CVE-2022-48751 net/smc: Transitional solution for clcsock race issue
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| debian/linux(Debian:12) | < 5.16.7-1 | 5.16.7-1 |
| debian/linux(Debian:13) | < 5.16.7-1 | 5.16.7-1 |
| debian/linux(Debian:14) | < 5.16.7-1 | 5.16.7-1 |
| Linux kernel | >= fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9, < 38f0bdd548fd2ef5d481b88d8a2bfef968452e34 | 38f0bdd548fd2ef5d481b88d8a2bfef968452e34 |
| Linux kernel | >= fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9, < 4284225cd8001e134f5cf533a7cd244bbb654d0f | 4284225cd8001e134f5cf533a7cd244bbb654d0f |
| Linux kernel | >= fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9, < c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760 | c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760 |
| Linux kernel | = d1d004585b40c212b338fc8a40cbaaf230ea4703 | No fix listed |
| Linux kernel | >= 4.19.299, < 4.20 | 4.20 |
| Linux kernel | = 5.1 | No fix listed |
| Linux kernel | < 5.15.19 | 5.15.19 |
| Linux kernel | < 5.16.5 | 5.16.5 |
| Linux kernel | < 5.17 | 5.17 |
| Linux kernel | >= 5.1, < 5.15.19 | 5.15.19 |
| Linux kernel | >= 5.16, < 5.16.5 | 5.16.5 |
| Linux kernel | = 5.17-rc1 | No fix listed |
References
- Debian Security Tracker CVE-2022-48751 vendor-advisory
- git.kernel.org patch
- git.kernel.org patch
- git.kernel.org patch
- Ubuntu CVE tracker vendor-advisory
- www.cve.org