CVE-2026-98636 Affecting bpftool package, versions <0:5.15.0-326.222.4.el9uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.18% (8th percentile)

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  • Snyk IDSNYK-ORACLE9-BPFTOOL-22153733
  • published3 Nov 2026
  • disclosed18 Oct 2026

Introduced: 18 Oct 2026

NewCVE-2026-98636  (opens in a new tab)

How to fix?

Upgrade Oracle:9 bpftool to version 0:5.15.0-326.222.4.el9uek or higher.
This issue was patched in ELSA-2026-500574.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bpftool package and not the bpftool package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

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 Base Scores

version 3.1