CVE-2026-90203
CVE CVE-2026-90203EUVD EUVD-2026-81796Published 2026-09-17T16:07:20.000ZLast changed 2026-09-18T17:53:41.000ZCVSS 7.1
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: Squashfs: check block offset is not negative If a negative offset is read off disk (for example the offset into the decompressed fragment block), this will cause squashfs_copy_data() to perform an out of bounds access. Fix by checking if offset is negative, and returning 0. This matches existing behaviour where an offset beyond the block returns 0 bytes copied. To trigger this out of bounds access requires a crafted Squashfs filesystem and CAP_SYS_ADMIN to mount it. Unprivileged users will not be able to mount such a filesystem, but once mounted, an unprivileged user can trigger the out of bounds access by reading the crafted file with the negative offset.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux f400e12656ab518be107febfe2315fb1eab5a342 <e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe; 2.6.29; patch: 6.6.157; f400e12656ab518be107febfe2315fb1eab5a342 <e300eb5002925b29be803d2661af07266cfa267e; f400e12656ab518be107febfe2315fb1eab5a342 <3d2f0cb66c909ea2312cdef465165bb9a3ba2d84; patch: 6.18.52; f400e12656ab518be107febfe2315fb1eab5a342 <d0a3729d464fcf516416a41cf304c0c92126ee03; patch: 5.15.221; patch: 7.3-rc1; f400e12656ab518be107febfe2315fb1eab5a342 <bbb2218eb072b0a15dc063929200183bd23c2344; patch: 7.2.6; patch: 6.1.188; patch: 0; f400e12656ab518be107febfe2315fb1eab5a342 <c2a126fca820ae74872da28de68dc74d4595dc4b; patch: 6.12.110; f400e12656ab518be107febfe2315fb1eab5a342 <95dadf366c117dcdca78a570e6832071deab1ecd; patch: 5.10.270; f400e12656ab518be107febfe2315fb1eab5a342 <b169185d5c672b989985c6c2e38cafab2548ba88
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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