Vulnerability in Linux

CVE-2026-43304

In the Linux kernel, the following vulnerability has been resolved: libceph: define and enforce CEPH_MAX_KEY_LEN When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length. The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-43304: held from 0.005 to 0.007.

EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.002

Affected products

  • Linux — versions 6.1.165, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, cd1a677cad994021b19665ed476aea63f5d54f31
  • Linux Kernel

References

Frequently asked questions

What is CVE-2026-43304?
CVE-2026-43304 is a critical-severity vulnerability in Linux. CVSS score: 9.8/10. Published 2026-05-08.
How severe is CVE-2026-43304?
Critical severity. CVSS v3 base score is 9.8 out of 10.