Squashfs: check block offset is not negative (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.17 % · percentile 6 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
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.
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
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H | Linux |
| CVSS 3.1 | HIGH 7.1 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-81796
- GCVE · GCVE-0-2026-90203
CERT-FR advisories
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1372 — Multiples vulnérabilités dans les produits SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1335 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected f400e12656ab518be107febfe2315fb1eab5a342 < b169185d5c672b989985c6c2e38cafab2548ba88 ; affected f400e12656ab518be107febfe2315fb1eab5a342 < c2a126fca820ae74872da28de68dc74d4595dc4b ; affected f400e12656ab518be107febfe2315fb1eab5a342 < 95dadf366c117dcdca78a570e6832071deab1ecd ; affected f400e12656ab518be107febfe2315fb1eab5a342 < 3d2f0cb66c909ea2312cdef465165bb9a3ba2d84 ; affected f400e12656ab518be107febfe2315fb1eab5a342 < bbb2218eb072b0a15dc063929200183bd23c2344 ; affected f400e12656ab518be107febfe2315fb1eab5a342 < d0a3729d464fcf516416a41cf304c0c92126ee03 |
| Linux · Linux | affected 2.6.29 ; unaffected 0 < 2.6.29 ; unaffected 5.10.270 ≤ 5.10.* ; unaffected 5.15.221 ≤ 5.15.* ; unaffected 6.1.188 ≤ 6.1.* ; unaffected 6.6.157 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |