{"id":"CVE-2026-43304","title":"libceph: define and enforce CEPH_MAX_KEY_LEN","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: define and enforce CEPH_MAX_KEY_LEN\n\nWhen decoding the key, verify that the key material would fit into\na fixed-size buffer in process_auth_done() and generall…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 6405e8c680974bb74e2c98d5249fb52c7b12a6c6","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 8d745d38c88ecbed95f6b2b39857bf89f35a3244","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < e1dc45d97975f9db65694d234fbddf1915176e16","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 1b275bd49e58752efb83767a5d1aed41356c5e64","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < d82467c07b03a27c3c5469b62bb3b726305a80bb","Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf","Linux 5.11"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T15:16:20.550708Z"},"published":"2026-05-08","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:38.629Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43304","references":[{"url":"https://git.kernel.org/stable/c/6405e8c680974bb74e2c98d5249fb52c7b12a6c6"},{"url":"https://git.kernel.org/stable/c/8d745d38c88ecbed95f6b2b39857bf89f35a3244"},{"url":"https://git.kernel.org/stable/c/e1dc45d97975f9db65694d234fbddf1915176e16"},{"url":"https://git.kernel.org/stable/c/1b275bd49e58752efb83767a5d1aed41356c5e64"},{"url":"https://git.kernel.org/stable/c/c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed"},{"url":"https://git.kernel.org/stable/c/d82467c07b03a27c3c5469b62bb3b726305a80bb"},{"url":"https://git.kernel.org/stable/c/ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf"}],"tags":["cve.org"],"epss":0.00738,"epssPercentile":0.53607,"ingestedAt":"2026-10-16T17:24:46.691Z","slug":"CVE-2026-43304","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: define and enforce CEPH_MAX_KEY_LEN\n\nWhen decoding the key, verify that the key material would fit into\na fixed-size buffer in process_auth_done() and generally has a sane\nlength.\n\nThe new CEPH_MAX_KEY_LEN check replaces the existing check for a key\nwith no key material which is a) not universal since CEPH_CRYPTO_NONE\nhas to be excluded and b) doesn't provide much value since a smaller\nthan needed key is just as invalid as no key -- this has to be handled\nelsewhere anyway.\n\n## Affected\n\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 6405e8c680974bb74e2c98d5249fb52c7b12a6c6`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 8d745d38c88ecbed95f6b2b39857bf89f35a3244`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < e1dc45d97975f9db65694d234fbddf1915176e16`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < 1b275bd49e58752efb83767a5d1aed41356c5e64`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < d82467c07b03a27c3c5469b62bb3b726305a80bb`\n- `Linux >= cd1a677cad994021b19665ed476aea63f5d54f31 < ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf`\n- `Linux 5.11`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}