CVE-2026-90391 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20507337
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90391 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
lib/test_hmm: fail dmirror_fault() when the mirrored mm is gone
dmirror_fault() is called from the dmirror_read() and dmirror_write() retry loops after dmirror_do_read() or dmirror_do_write() finds a missing device page table entry.
If the mirrored mm has already exited, mmget_not_zero() fails. The current code returns 0 in that case, which tells the caller that faulting succeeded even though no page was faulted and no device page table entry was installed. The caller then retries the same address, hits -ENOENT again, and can loop forever without making progress.
Return -EFAULT instead, so the ioctl fails when the mirrored mm is no longer faultable.
References
- https://security-tracker.debian.org/tracker/CVE-2026-90391
- https://git.kernel.org/stable/c/2636569ea7c19d9a40db4a1e8d0a027bdacf1569
- https://git.kernel.org/stable/c/50606ced303782f8715e2d0b98ca374ea498fa29
- https://git.kernel.org/stable/c/541a67f21ab807c8dbc0ea88d5a2eb73b2618090
- https://git.kernel.org/stable/c/6a8024511ddf4877435c34fb3d6028aa8e590649
- https://git.kernel.org/stable/c/701347e31aa607f3782403151a3125729d685275
- https://git.kernel.org/stable/c/a2074f86fc9653831e4fb7b711bb715db330f182
- https://git.kernel.org/stable/c/af7a6d6ec36a16a583ba2e4e9984c3cf1fe34655
- https://git.kernel.org/stable/c/d8e64ffab01e032ae29159d27230ace8cf8bdc80