What’s Vulnerable › Vulnerabilities

CVE-2023-53643: nvme-tcp: don't access released socket during error recovery

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-07 · updated 2026-10-15
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: don't access released socket during error recovery While the error recovery work is temporarily failing reconnect attempts, running the 'nvme list' command causes a kernel NULL pointer dereference by calling getsockname() with a released socket. During error recovery work, the nvme tcp socket is released and a new one created, so it is not safe to access the socket without proper check.

Affected products

• Linux kernel: from 6.1 before 6.1.18; from 6.2 before 6.2.5 — fixed in 6.1.18, 6.2.5

How to fix

Upgrade to a fixed version: Linux kernel 6.1.18, 6.2.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/76d54bf20cdcc1ed7569a89885e09636e9a8d71d
• https://git.kernel.org/stable/c/d82f762db4776fa11de88018f0f5de2d5db72a72
• https://git.kernel.org/stable/c/fe2d9e54165dadaa0d0cc3355c0be9c3e129fa0d

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