SB20260720372 - Out-of-bounds read in Linux kernel target iscsi driver
Published: July 20, 2026
Security Bulletin ID
SB20260720372
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-63888)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in iscsit_handle_text_cmd() when processing Text PDUs with DataDigest enabled. A remote user can send a specially crafted text request to cause a denial of service.
The issue is triggered when DataDigest is negotiated for the connection.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/5118ea225fe63b44207ba88047e4866e1ea43812
- https://git.kernel.org/stable/c/6e22a1cdcc8277af4acc43710577157b77a02c5d
- https://git.kernel.org/stable/c/778c2ab142c625a8a8afa570e0f9b7873f445d99
- https://git.kernel.org/stable/c/89c81d1228c00fa6dd91de6c1c5aa1ef8a7875e3
- https://git.kernel.org/stable/c/badf178b76b0690851df00f4ca9cf2eb8eb0f963
- https://git.kernel.org/stable/c/d3e9b79aa794f7a23e82de4d710e7d2df610e349
- https://git.kernel.org/stable/c/ec9f19d52074a191ed1756ed4a7d39fff1a2085c
- https://git.kernel.org/stable/c/f7948af0dd03de84079dcd4dc215a69fd6fbb95d