SB2026090547 - Improper Check for Unusual or Exceptional Conditions in Linux kernel tls
Published: September 5, 2026
Security Bulletin ID
SB2026090547
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-80904)
CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass TLS record authentication.
The vulnerability exists due to improper handling of cryptographic decryption errors in tls_sw_splice_read() when reading TLS records through splice. A remote attacker can cause a TLS record that failed authentication to be delivered through splice to bypass TLS record authentication.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/06c2a53604fa1dc4820063828d7dadb3675b7af8
- https://git.kernel.org/stable/c/18ae1e95f20867106a28820c208a9cec99dda861
- https://git.kernel.org/stable/c/4b177911eb9f799e9841c2f87c75b08cb112757a
- https://git.kernel.org/stable/c/82d9269f01ebfd835b6256aa17016a974cbbc647
- https://git.kernel.org/stable/c/976df67f463db1fddaf2a32fb04f57ad2891a23d
- https://git.kernel.org/stable/c/a808aadff634c7a408b2ab84d5919e9a741fdb5b