Answer in brief
CVE-2026-98636 records a Unknown severity vulnerability in squashfs: Add dictionary size range check to prevent shift-out-of-bounds. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ff750311d30acc9564ef577050794953eee59f01 <b02948a23455f8190a53887b2d2c13ae1d360cea || >=ff750311d30acc9564ef577050794953eee59f01 <9d9c5c218ea356a1d88765214ad2919605280ab1 || >=ff750311d30acc9564ef577050794953eee59f01 <7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1 || >=ff750311d30acc9564ef577050794953eee59f01 <c68e0068a236f9a7dfc19720bdf11e5d80a85089 || >=ff750311d30acc9564ef577050794953eee59f01 <88c673a0bd233df44ca0020da82f4fd3876de27a || >=ff750311d30acc9564ef577050794953eee59f01 <0cb85377daaefb4ce5ce72975f2deb27ee0e0cad || >=ff750311d30acc9564ef577050794953eee59f01 <e1ca4e3a380ef3e8f46ce006f1146392e3f32c98 || >=ff750311d30acc9564ef577050794953eee59f01 <1f7745fb3580152ca902ef181b605f33cabfb1d0 | b02948a23455f8190a53887b2d2c13ae1d360cea, 9d9c5c218ea356a1d88765214ad2919605280ab1, 7a1c293e7aa17f1afaee0684e0e931fe23a5a6b1, c68e0068a236f9a7dfc19720bdf11e5d80a85089, 88c673a0bd233df44ca0020da82f4fd3876de27a, 0cb85377daaefb4ce5ce72975f2deb27ee0e0cad, e1ca4e3a380ef3e8f46ce006f1146392e3f32c98, 1f7745fb3580152ca902ef181b605f33cabfb1d0 |
| Linux/Linuxgeneric | 2.6.39 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.