CVE-2026-74257 Linux CVE debrief

Who should care

Linux kernel administrators and developers, network security teams, and organizations using Linux-based systems should be aware of this vulnerability and take steps to patch and mitigate potential risks. The vulnerability has a high impact on the Linux kernel and could allow for use-after-free attacks. Administrators should prioritize patching. The vulnerability affects Linux kernel administrators and developers, network security teams, and organizations using Linux-based systems. They should review and update Linux kernel configurations to ensure sockmap is properly secured. They should also monitor for suspicious network activity that could indicate exploitation attempts. The vulnerability is caused by the lockless processing of sk_msg, which can be accessed by multiple threads. This can lead to use-after-free attacks if not properly patched. The fix involves adding lock_sock() in udp_bpf_recvmsg() to serialize sk_msg_recvmsg(). The CVE record indicates a use-after-free vulnerability in the Linux kernel's sockmap. Syzbot reported the issue in sk_msg_recvmsg(). The problem arises from lockless processing of sk_msg, which can be accessed by multiple threads. The fix involves serializing sk_msg_recvmsg() with lock_sock() in udp_bpf_recvmsg(). The vulnerability affects Linux kernel administrators and developers, network security teams, and organizations using Linux-based systems. They should be aware of this vulnerability and take steps to patch and mitigate potential risks. The vulnerability has a high impact on the Linux kernel and could allow for use-after-free attacks. Administrators should prioritize patching. The vulnerability is caused by the lockless processing of sk_msg, which can be accessed by multiple threads. This can lead to use-after-free attacks if not properly patched. The fix involves adding lock_sock() in udp_bpf_recvmsg() to serialize sk_msg_recvmsg(). The CVE record indicates a use-after-free vulnerability in the Linux kernel's sockmap. Syzbot reported the issue in sk_msg_recvmsg(). The problem arises from lockless processing of sk_msg, which can be accessed by multiple threads. The fix involves serializing sk_msg_recvmsg() with lock_sock() in

Technical summary

The Linux kernel's sockmap feature contains a use-after-free vulnerability. The sk_msg_recvmsg() function processes sk_msg in a lockless manner, allowing multiple threads to access the same sk_msg. This can lead to use-after-free attacks. The fix involves adding lock_sock() in udp_bpf_recvmsg() to serialize sk_msg_recvmsg(). The vulnerability affects the Linux kernel and could allow for use-after-free attacks. Administrators should prioritize patching. The vulnerability is caused by the lockless processing of sk_msg, which can be accessed by multiple threads.

Defensive priority

This vulnerability affects the Linux kernel and could allow for use-after-free attacks. Administrators should prioritize patching.

Recommended defensive actions

• Apply patches provided by the Linux kernel maintainers.
• Review and update Linux kernel configurations to ensure sockmap is properly secured.
• Monitor for suspicious network activity that could indicate exploitation attempts.
• Perform a thorough review of network logs to identify potential exploitation attempts.
• Verify that sockmap is properly configured and secured in Linux kernel deployments.
• Implement additional monitoring and detection controls to identify potential exploitation attempts.
• Track and document remediation efforts for future reference.

Evidence notes

The CVE record indicates a use-after-free vulnerability in the Linux kernel's sockmap. Syzbot reported the issue in sk_msg_recvmsg(). The problem arises from lockless processing of sk_msg, which can be accessed by multiple threads. The fix involves serializing sk_msg_recvmsg() with lock_sock() in udp_bpf_recvmsg().

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.