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CVE-2026-98636

Unknown

Last modified

CVE-2026-98636 is a vulnerability of currently unknown severity. 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..

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= ff750311d30acc9564ef577050794953eee59f01, < b02948a23455f8190a53887b2d2c13ae1d360cea; >= ff750311d30acc9564ef577050794953eee59f01, < 9d9c5c218ea356a1d88765214ad2919605280ab1; >= ff750311d30acc9564ef577050794953eee59f01, < 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1; >= ff750311d30acc9564ef577050794953eee59f01, < c68e0068a236f9a7dfc19720bdf11e5d80a85089; >= ff750311d30acc9564ef577050794953eee59f01, < 88c673a0bd233df44ca0020da82f4fd3876de27a; >= ff750311d30acc9564ef577050794953eee59f01, < 0cb85377daaefb4ce5ce72975f2deb27ee0e0cad; >= ff750311d30acc9564ef577050794953eee59f01, < e1ca4e3a380ef3e8f46ce006f1146392e3f32c98; >= ff750311d30acc9564ef577050794953eee59f01, < 1f7745fb3580152ca902ef181b605f33cabfb1d0
LinuxLinux2.6.39

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98636?
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.
How severe is CVE-2026-98636?
Severity scoring for CVE-2026-98636 is pending analysis.
How do I fix CVE-2026-98636?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST