high · CVSS v3 7.1

CVE-2026-98636

In the Linux kernel, the following vulnerability has been resolved: squashfs: Add dictionary size range check to prevent…

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; dict_size=0, n=-1 if (opts->dict_size != (1 dict_size != (1 << n) + (1 << (n + 1))) <----shift-out-of-bounds Fix it by adding a dictionary size range check before the shift operation.

Scores

Severity
high
CVSS v2
2.1
CVSS v3
7.1
CVSS v4
—
EPSS
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