nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Fix
- Fixed in 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The Linux kernel's NVMe-over-Fabrics target authentication code (DH-HMAC-CHAP negotiation) is affected. A remote host sending a malformed authentication message could cause the kernel to read memory beyond the end of an allocated buffer, which could lead to a crash or leak of kernel memory contents.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
In the Linux kernel, the following vulnerability has been resolved: nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() nvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with the host-supplied transfer length (tl) and hands it to nvmet_auth_negotiate() without passing tl along. nvmet_auth_negotiate() then reads the negotiate header and, for each of the halen hash identifiers and dhlen DH group identifiers, indexes into the fixed idlist[60] array (hashes at idlist[0..halen), groups at idlist[30..]). Neither the transfer length nor halen/dhlen is validated. A malicious or non-conformant host can report a tl smaller than the negotiate structure, or a halen/dhlen larger than the array (both are u8, up to 255), making the loops read past the end of the allocated buffer (heap out-of-bounds read). The sibling nvmet_auth_reply() already validates tl against the structure size; the negotiate path did not. Pass tl into nvmet_auth_negotiate(), reject a tl that does not cover the negotiate data plus one full protocol descriptor, and reject halen/dhlen larger than NVME_AUTH_DHCHAP_MAX_DH_IDS.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From db1312dd95488b5e6ff362ff66fcf953a46b1821 · fixed in 89ff11b72f38976f3b5aea23a5228ee05e277209; From db1312dd95488b5e6ff362ff66fcf953a46b1821 · fixed in aaac783950b17c57df9b6f7344747cacb1a407ed; From db1312dd95488b5e6ff362ff66fcf953a46b1821 · fixed in c38a8186326799957d293d370136c128cd113916; From db1312dd95488b5e6ff362ff66fcf953a46b1821 · fixed in 7b81e4d2230e3d2d372c826180c4ef0efc244f31; From db1312dd95488b5e6ff362ff66fcf953a46b1821 · fixed in 5bb96cc218835769ab74ec7f3ea2bf81fbffe955
- Linux Linux
6.0
- KernelLinux
From 6.0.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6