{"id":"CVE-2026-43405","revision":null,"records":[{"revision":"483726f28d494771af5061406c4d0d1d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43405","aliases":[],"title":"libceph: Use u32 for non-negative values in ceph_monmap_decode()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Use u32 for non-negative values in ceph_monmap_decode()\n\nThis patch fixes unnecessary implicit conversions that change signedness\nof blob_len and num_mon in ceph_monmap_decode().\nCurrently blob_len and num_mon are (signed) int variables. They are used\nto hold values that are always non-negative and get assigned in\nceph_decode_32_safe(), which is meant to assign u32 values. Both\nvariables are subsequently used as unsigned values, and the value of\nnum_mon is further assigned to monmap->num_mon, which is of type u32.\nTherefore, both variables should be of type u32. This is especially\nrelevant for num_mon. If the value read from the incoming message is\nvery large, it is interpreted as a negative value, and the check for\nnum_mon > CEPH_MAX_MON does not catch it. This leads to the attempt to\nallocate a very large chunk of memory for monmap, which will most likely\nfail. In this case, an unnecessary attempt to allocate memory is\nperformed, and -ENOMEM is returned instead of -EINVAL.","state":0,"publishedAt":"2026-05-08T14:21:45.581+00:00","modifiedAt":"2026-10-19T19:16:28.48+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ceph/mon_client.c\"\n ],\n \"versions\": [\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"ee5588e2bc41acb73f6676c0520420c107cd0140\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"86f7060cd638d6eb042e8ed780fb83a59ca0dcb3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"5f2806684b05bd24d05c091083b8e2517ba8ffac\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"b268984ae88cb0dcd7a8e8263962c748448e26e8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"08bc6173fd611ad5a40f472bf5f15b92aea0fe40\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c\",\n \"lessThan\": \"770444611f047dbfd4517ec0bc1b179d40c2f346\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/ceph/mon_client.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.11\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.11\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.203\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.167\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.130\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.78\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.19\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.9\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140","https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3","https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac","https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8","https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace","https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40","https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43405","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43405","identifiers":["CVE-2026-43405"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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