SB2026050868 - Out-of-bounds read in Linux kernel netfilter
Published: May 8, 2026
Security Bulletin ID
SB2026050868
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-2026-43453)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in pipapo_drop() when processing nftables set data. A local attacker can trigger the vulnerable code path to disclose sensitive information.
The issue occurs on the last iteration when evaluating rulemap[i + 1].n, causing a read 4 bytes past the end of the stack-allocated rulemap array.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0a55d62cdb628923d8a21724374a70c76ac7d19d
- https://git.kernel.org/stable/c/1957e793196e7f8557374fd4eda53abcbb42e1c0
- https://git.kernel.org/stable/c/324b749aa5b2d516ccfab933df9d3f56e7807f5f
- https://git.kernel.org/stable/c/57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e
- https://git.kernel.org/stable/c/60c1d18781e37bfb96290b86510eb01c5fa24d75
- https://git.kernel.org/stable/c/d6d8cd2db236a9dd13dbc2d05843b3445cc964b5
- https://git.kernel.org/stable/c/dfbdac719198778b581bc0dd055df2542edb8c62
- https://git.kernel.org/stable/c/e047f6fbb975f685d6c9fcef95b3b7787a79b46d