Squashfs: check block offset is not negative
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.
CVE-2026-90203
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90203
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "b169185d5c672b989985c6c2e38cafab2548ba88",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "c2a126fca820ae74872da28de68dc74d4595dc4b",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "95dadf366c117dcdca78a570e6832071deab1ecd",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "3d2f0cb66c909ea2312cdef465165bb9a3ba2d84",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "bbb2218eb072b0a15dc063929200183bd23c2344",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "d0a3729d464fcf516416a41cf304c0c92126ee03",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "e4afd90bc7bf3dd477970c6c42bdd29ad3fda7fe",
"versionType": "git"
},
{
"status": "affected",
"version": "f400e12656ab518be107febfe2315fb1eab5a342",
"lessThan": "e300eb5002925b29be803d2661af07266cfa267e",
"versionType": "git"
}
],
"programFiles": [
"fs/squashfs/cache.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.29"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.29",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/squashfs/cache.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90203
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #36581 · Revision 1
- Added to Heist Feed
- Publisher date