SB20260824117 - Out-of-bounds read in Linux kernel packet
Published: August 24, 2026
Security Bulletin ID
SB20260824117
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local 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-2026-74667)
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:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the packet-socket transmit path in net/packet/af_packet.c when transmitting frames through the PACKET_QDISC_BYPASS path. A local user can send a specially crafted packet through a packet socket to cause a denial of service.
The issue occurs when a driver reads eth_hdr(skb) on transmit with an unset MAC header.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1e43a1d66615f411d427f9df1f46dd049d9e3681
- https://git.kernel.org/stable/c/2610ed4e86a4590234a9d70518c469751c5af231
- https://git.kernel.org/stable/c/284f3e7a3f1a743fdf89e304fd1f19d5ffcff46d
- https://git.kernel.org/stable/c/4057853a91fb796c4f47c7d1baf1aa085394148e
- https://git.kernel.org/stable/c/971aa7d99242bbf09513e27b7a243f0b29ff23ae
- https://git.kernel.org/stable/c/b47ba8fe6e1d2df8c92048de5afafd059447dc30
- https://git.kernel.org/stable/c/c2707480cfbf19c7619acc9c089d17f20869821f
- https://git.kernel.org/stable/c/fdd4d7d52358a58e351dd9d82530c04eba8ccd7a