SB20260917182 - Out-of-bounds read in Linux kernel isofs
Published: September 17, 2026
Security Bulletin ID
SB20260917182
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-89778)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to read memory out of bounds.
The vulnerability exists due to an out-of-bounds read in zisofs_fill_pages() when reading a compressed file on a mounted ISO9660 image containing a crafted ZF Rock Ridge record. A remote attacker can provide a crafted ISO9660 image to read memory out of bounds.
The issue is triggered when an empty zisofs block follows a sub-page block with a nonzero page offset.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/68d4d3e78150c7ed7d1195af63ad1e6ace30c661
- https://git.kernel.org/stable/c/85904076cece72ee3194646ad7ac8e6659d999aa
- https://git.kernel.org/stable/c/8b994ac5778a725982fd6a8a3afcaa068d4a93e3
- https://git.kernel.org/stable/c/9c6eace8d07e90f038c89eb3b756d65a7e259d48
- https://git.kernel.org/stable/c/ad3249cdf9d4ba34bb8b1ff3956a4020fdfb5b0a
- https://git.kernel.org/stable/c/cd616aa0449a772a6956abf03358f0ff31720580
- https://git.kernel.org/stable/c/f03425dcbe04aec3c27b9917e97d7d23a2908dda