squashfs: Add dictionary size range check to prevent shift-out-of-bounds
In the Linux kernel, the following vulnerability has been resolved: squashfs: Add dictionary size range check to prevent shift-out-of-bounds When an abnormal SquashFS image (COMP_OPTS flag is 1 but dictionary size is 0) is mounted, and performs shift operations using dictionarysize, the shift exponent is -1, causing a shift-out-of-bounds. Detail as below: squashfs_comp_opts(msblk, buffer, length) squashfs_xz_comp_opts() if (comp_opts) n = ffs(opts->dict_size) - 1;<----opts->dict_size=0, n=-1 if (opts->dict_size != (1 << n) && opts->dict_size != (1 << n) + (1 << (n + 1))) <----shift-out-of-bounds Fix it by adding a dictionary size range check before the shift operation.
CVE-2026-98636
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-2026-98636
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": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "b02948a23455f8190a53887b2d2c13ae1d360cea",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "9d9c5c218ea356a1d88765214ad2919605280ab1",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "c68e0068a236f9a7dfc19720bdf11e5d80a85089",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "88c673a0bd233df44ca0020da82f4fd3876de27a",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "0cb85377daaefb4ce5ce72975f2deb27ee0e0cad",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "e1ca4e3a380ef3e8f46ce006f1146392e3f32c98",
"versionType": "git"
},
{
"status": "affected",
"version": "ff750311d30acc9564ef577050794953eee59f01",
"lessThan": "1f7745fb3580152ca902ef181b605f33cabfb1d0",
"versionType": "git"
}
],
"programFiles": [
"fs/squashfs/xz_wrapper.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.39"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.39",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/squashfs/xz_wrapper.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98636
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38655 · Revision 1
- Added to Heist Feed
- Publisher date