Description
In the Linux kernel, the following vulnerability has been resolved: x86: shadow stacks: proper error handling for mmap lock 김영민 reports that shstk_pop_sigframe() doesn't check for errors from mmap_read_lock_killable(), which is a silly oversight, and also shows that we haven't marked those functions with "__must_check", which would have immediately caught it. So let's fix both issues.
Affected products
linux: linux kernel
References5
- git.kernel.org/stable/c/262b6d38a81d51b135db81e1f30c13d30e38feee Patch
- git.kernel.org/stable/c/52f657e34d7b21b47434d9d8b26fa7f6778b63a0 Patch
- git.kernel.org/stable/c/c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 Patch
- git.kernel.org/stable/c/1a30468eff661937d978495644d2e5ebfeef5ce6
- git.kernel.org/stable/c/c79cf42321600e931933e11f94aba8b245d4cd66
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 1 · as of 13 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.