CVE-2026-98636
Received
Received - Intake
Shift-Out-of-Bounds in Linux Kernel SquashFS
Vulnerability report for CVE-2026-98636, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-18
Last updated on: 2026-10-18
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | ff750311d30acc9564ef577050794953eee59f01 |
| Linux | Linux | 2.6.39 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
