SB20260727253 - Out-of-bounds read in Linux kernel isofs
Published: July 27, 2026
Security Bulletin ID
SB20260727253
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-64317)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in Rock Ridge SL record handling in fs/isofs/rock.c when parsing a crafted ISO 9660 image containing a malformed symbolic link record. A local user can supply a crafted filesystem image to disclose sensitive information.
The issue can copy adjacent kernel memory into the symlink body returned to user space by readlink().
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1015e1c4b2fadd9c09704e24738e46598778c869
- https://git.kernel.org/stable/c/36fe7d25dbc40da0c6b1dd4513a4f69ac6164eee
- https://git.kernel.org/stable/c/5fa1d6a5ec2356d2107dead614437c66fa7138b1
- https://git.kernel.org/stable/c/6bf41db09ef935d76fcc84ccf213b42c18de95ee
- https://git.kernel.org/stable/c/9830725078c8483c6831ec10222ae724806ea36b
- https://git.kernel.org/stable/c/a22cb6bb54dc167047ea9e70d97dfbc2c15649e3
- https://git.kernel.org/stable/c/b5699642640d6cff357638738c5293985cd5a53d
- https://git.kernel.org/stable/c/b736b12108fd116c41777628f5a333791604df26