CVE-2026-31431. 100% Reliable Linux LPE — no race, no per-distro offsets, page-cache write that bypasses on-disk file-integrity tools and crosses containers. Found by Xint Code.
7.0-rc7 is probably due to the 7.0 release early mid april. So the fix was in the mainline on 1st of April. The commit on 11th from GKH was probably due to the release.
I am not that familiar with the commit and release structure to get more into detail. But to me it clearly looks like the statement on copy.fail is correct, that the fix was in mainline on 1st of April.
From my point of view, I would suggest that maybe the communication downstream to the distros was not handled that well? But who would be to blaim? The researches that would need to communicate this issue to most existing distros? Linux maintainers? Distro maintainers?
Hard to say, without knowing the communication of the related mailinglists and disclousre etc.
Looking at the CVE on NIST,i found following commit which dates to 30.03
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5
the debian cve tracker also links to that page, but they have written 7.0-rc7 besides it.
https://security-tracker.debian.org/tracker/CVE-2026-31431
the openwall link has some comments that talk about the delayed patches, Greg KH also commented.
7.0-rc7 is probably due to the 7.0 release early mid april. So the fix was in the mainline on 1st of April. The commit on 11th from GKH was probably due to the release.
I am not that familiar with the commit and release structure to get more into detail. But to me it clearly looks like the statement on copy.fail is correct, that the fix was in mainline on 1st of April.
From my point of view, I would suggest that maybe the communication downstream to the distros was not handled that well? But who would be to blaim? The researches that would need to communicate this issue to most existing distros? Linux maintainers? Distro maintainers?
Hard to say, without knowing the communication of the related mailinglists and disclousre etc.