CVE-2026-80791

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < 447b668faa14710f611e714031e3739ac3ec3a4faffected
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < 8f6363c8d54dde95982f0ab45e77cf57ec0efd62affected
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < dfcf013f77709ebdb282767edc2795a37cab5b57affected
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < b26189d28442183a8b5edb754f4a6918f77ca84eaffected
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < 2dcc9226203da7275a9c29d20007da278d73d5e9affected
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < 1d6837d98bf966a041af65de5f78de7409ff83bcaffected
LinuxLinuxdb1312dd95488b5e6ff362ff66fcf953a46b1821 < 3ddcfb013322aa37eaa7a0d344b73079c38dfa21affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.185 <= 6.1.*unaffected
LinuxLinux6.6.154 <= 6.6.*unaffected
LinuxLinux6.12.106 <= 6.12.*unaffected
LinuxLinux6.18.47 <= 6.18.*unaffected
LinuxLinux7.1.11 <= 7.1.*unaffected
LinuxLinux7.2.1 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References