futex/pi: Plug private futex exec() race

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80777
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:03 UTC
Updated2026-09-04 16:18:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: futex/pi: Plug private futex exec() race The check for private futexes whether the waiter's mm, which is stored in the futex_key and copied into the pi_state, is the same as the owner's mm is not sufficient for exec(). exec() has a gap where the mm check fails to give the correct answer: exec() ... exec_release_mm() futex_exec_release() tsk::futex::exit_state = EXITING; cleanup_robust_list(); 1) tsk::futex::exit_state = OK; ... old_mm = tsk::mm; 2) tsk::mm = ->mm; Between #1 and #2 the check for the mm is wrong as that mm is about to be swapped out and eventually freed. Plug this gap by: 1) Setting tsk::futex::exit_state to FUTEX_STATE_DEAD in futex_exec_release() 2) Setting tsk::futex::exit_state to FUTEX_STATE_OK after the mm has been switched. From a futex point of view the task is dead after it finished the robust list cleanup up to the point where it sets the state to OK again.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 80367ad01d93ac781b0e1df246edaf006928002f fdf538b2e69653ff740e84042245018e5680cd7b git Not specified
CNA Linux Linux affected 80367ad01d93ac781b0e1df246edaf006928002f 0478bc6bf197629fea0331d65b39eeea043c6cf0 git Not specified
CNA Linux Linux affected 80367ad01d93ac781b0e1df246edaf006928002f d7944cee62ec6cca1c90780a766960a57d3b4bb8 git Not specified
CNA Linux Linux affected 80367ad01d93ac781b0e1df246edaf006928002f c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c5f0bc9fd1cec4a00400cc727fcde03e0fde17cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7944cee62ec6cca1c90780a766960a57d3b4bb8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0478bc6bf197629fea0331d65b39eeea043c6cf0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fdf538b2e69653ff740e84042245018e5680cd7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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