CVE-2026-90203Squashfs: check block offset is not negative
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f400e12656ab518be107febfe2315fb1eab5a342 before b169185d5c672b989985c6c2e38cafab2548ba88; from f400e12656ab518be107febfe2315fb1eab5a342 before c2a126fca820ae74872da28de68dc74d4595dc4b; from f400e12656ab518be107febfe2315fb1eab5a342 before 95dadf366c117dcdca78a570e6832071deab1ecd; from f400e12656ab518be107febfe2315fb1eab5a342 before 3d2f0cb66c909ea2312cdef465165bb9a3ba2d84; from f400e12656ab518be107febfe2315fb1eab5a342 before bbb2218eb072b0a15dc063929200183bd23c2344; from f400e12656ab518be107febfe2315fb1eab5a342 before d0a3729d464fcf516416a41cf304c0c92126ee03; from f400e12656ab518be107febfe2315fb1eab5a342 before e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe; from f400e12656ab518be107febfe2315fb1eab5a342 before e300eb5002925b29be803d2661af07266cfa267e | CNA record |
References
- https://git.kernel.org/stable/c/b169185d5c672b989985c6c2e38cafab2548ba88
- https://git.kernel.org/stable/c/c2a126fca820ae74872da28de68dc74d4595dc4b
- https://git.kernel.org/stable/c/95dadf366c117dcdca78a570e6832071deab1ecd
- https://git.kernel.org/stable/c/3d2f0cb66c909ea2312cdef465165bb9a3ba2d84
- https://git.kernel.org/stable/c/bbb2218eb072b0a15dc063929200183bd23c2344
- https://git.kernel.org/stable/c/d0a3729d464fcf516416a41cf304c0c92126ee03
- https://git.kernel.org/stable/c/e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe
- https://git.kernel.org/stable/c/e300eb5002925b29be803d2661af07266cfa267e
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.