squashfs: Add dictionary size range check to prevent shift-out-of-bounds

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98636
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:16 UTC
Updated2026-10-19 10:19:27 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 b02948a23455f8190a53887b2d2c13ae1d360cea git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 9d9c5c218ea356a1d88765214ad2919605280ab1 git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1 git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 c68e0068a236f9a7dfc19720bdf11e5d80a85089 git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 88c673a0bd233df44ca0020da82f4fd3876de27a git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 0cb85377daaefb4ce5ce72975f2deb27ee0e0cad git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 e1ca4e3a380ef3e8f46ce006f1146392e3f32c98 git Not specified
CNA Linux Linux affected ff750311d30acc9564ef577050794953eee59f01 1f7745fb3580152ca902ef181b605f33cabfb1d0 git Not specified
CNA Linux Linux affected 2.6.39 Not specified
CNA Linux Linux unaffected 2.6.39 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/88c673a0bd233df44ca0020da82f4fd3876de27a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b02948a23455f8190a53887b2d2c13ae1d360cea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d9c5c218ea356a1d88765214ad2919605280ab1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c68e0068a236f9a7dfc19720bdf11e5d80a85089 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0cb85377daaefb4ce5ce72975f2deb27ee0e0cad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f7745fb3580152ca902ef181b605f33cabfb1d0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e1ca4e3a380ef3e8f46ce006f1146392e3f32c98 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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