CVE-2026-80791

Description

In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: zero the AUTH_RECEIVE response buffer nvmet_execute_auth_receive() allocates the response buffer with kmalloc() sized by the host-supplied AUTH_RECEIVE allocation length, but the DH-HMAC-CHAP builders write only a fixed-size message into it. The full allocation length is then copied to the wire by nvmet_copy_to_sgl(), so a remote initiator receives the bytes past the built message -- up to nearly a page of uninitialized slab -- during the pre-authentication handshake. Allocate the buffer with kzalloc() so the unwritten tail is zeroed before it is sent; conforming responses are unaffected.

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EPSS — Exploit Prediction

0.0021

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/1d6837d98bf966a041af65de5f78de7409ff83bc https://git.kernel.org/stable/c/2dcc9226203da7275a9c29d20007da278d73d5e9 https://git.kernel.org/stable/c/3ddcfb013322aa37eaa7a0d344b73079c38dfa21 https://git.kernel.org/stable/c/447b668faa14710f611e714031e3739ac3ec3a4f https://git.kernel.org/stable/c/8f6363c8d54dde95982f0ab45e77cf57ec0efd62 https://git.kernel.org/stable/c/b26189d28442183a8b5edb754f4a6918f77ca84e https://git.kernel.org/stable/c/dfcf013f77709ebdb282767edc2795a37cab5b57

Frequently Asked Questions

What is CVE-2026-80791? +

In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: zero the AUTH_RECEIVE response buffer nvmet_execute_auth_receive() allocates the response buffer with kmalloc() sized by the host-supplied AUTH_RECEIVE allocation length, but the DH-HMAC-CHAP builders write only a fixed-size message into it. The full allocation length is then copied to the wire by nvmet_copy_to_sgl(), so a remote initiator receives the bytes past the built message -- up to nearly a page of uninitialized slab -- during the pre-authentication handshake. Allocate the buffer with kzalloc() so the unwritten tail is zeroed before it is sent; conforming responses are unaffected.

How do I check if I'm vulnerable to CVE-2026-80791? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.