CVE-2026-90203
Description
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.
How to fix
- Linux Linuxb169185d5c672b989985c6c2e38cafab2548ba88, c2a126fca820ae74872da28de68dc74d4595dc4b, 95dadf366c117dcdca78a570e6832071deab1ecd, 3d2f0cb66c909ea2312cdef465165bb9a3ba2d84, bbb2218eb072b0a15dc063929200183bd23c2344, d0a3729d464fcf516416a41cf304c0c92126ee03, e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe, e300eb5002925b29be803d2661af07266cfa267e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < b169185d5c672b989985c6c2e38cafab2548ba88, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < c2a126fca820ae74872da28de68dc74d4595dc4b, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < 95dadf366c117dcdca78a570e6832071deab1ecd, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < 3d2f0cb66c909ea2312cdef465165bb9a3ba2d84, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < bbb2218eb072b0a15dc063929200183bd23c2344, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < d0a3729d464fcf516416a41cf304c0c92126ee03, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe, f400e12656ab518be107febfe2315fb1eab5a342 ≤ v < e300eb5002925b29be803d2661af07266cfa267e, 2.6.29 | b169185d5c672b989985c6c2e38cafab2548ba88, c2a126fca820ae74872da28de68dc74d4595dc4b, 95dadf366c117dcdca78a570e6832071deab1ecd, 3d2f0cb66c909ea2312cdef465165bb9a3ba2d84, bbb2218eb072b0a15dc063929200183bd23c2344, d0a3729d464fcf516416a41cf304c0c92126ee03, e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe, e300eb5002925b29be803d2661af07266cfa267e |
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