CVE-2026-43109

x86: shadow stacks: proper error handling for mmap lock

MEDIUM

5.5

CVSS Score

Published: May 6, 2026 at 07:40 AM UTC

Updated: June 17, 2026 at 10:48 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.1%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

6.19 ≤ v < 6.19.146.6 ≤ v < 6.12.886.6 ≤ v < 6.18.246.6 ≤ v < 6.19.146.6 ≤ v < 6.6.1406.6 ≤ v < 7.06.6 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 7.0 rc77fad2a432cd35bbf104d2d9d426e74902f22aa95

Vendor states this is fixed in 1a30468eff661937d978495644d2e5ebfeef5ce6 (fixed)

Vendor states this is fixed in 262b6d38a81d51b135db81e1f30c13d30e38feee (fixed)

Vendor states this is fixed in 52f657e34d7b21b47434d9d8b26fa7f6778b63a0 (fixed)

Vendor states this is fixed in c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 (fixed)

Vendor states this is fixed in c79cf42321600e931933e11f94aba8b245d4cd66 (fixed)

Vendor states this is fixed in 6.12.88 (unaffected)

Vendor states this is fixed in 6.18.24 (unaffected)

Vendor states this is fixed in 6.19.14 (unaffected)

Vendor states this is fixed in 6.6 (unaffected)

Vendor states this is fixed in 6.6.140 (unaffected)

Vendor states this is fixed in 7.0 (unaffected)