| Name | CVE-2026-98636 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4850-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bookworm | 6.1.176-1 | vulnerable |
| bookworm (security) | 6.1.190-1 | fixed | |
| trixie | 6.12.107-1 | vulnerable | |
| trixie (security) | 6.12.115-2 | fixed | |
| forky | 7.2.15-1 | fixed | |
| sid | 7.3.3-1 | fixed | |
| linux-6.12 (PTS) | bookworm (security) | 6.12.115-2~deb12u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | bookworm | 6.1.190-1 | |||
| linux | source | trixie | 6.12.113-1 | |||
| linux | source | (unstable) | 7.2.9-1 | |||
| linux-6.12 | source | bookworm | 6.12.113-1~deb12u1 | DLA-4850-1 |
https://git.kernel.org/linus/1f7745fb3580152ca902ef181b605f33cabfb1d0 (7.3-rc5)