{"id":"CVE-2026-43405","summary":"libceph: Use u32 for non-negative values in ceph_monmap_decode()","details":"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-\u003enum_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 \u003e 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.","modified":"2026-07-15T01:49:09.037903793Z","published":"2026-05-08T14:21:45.581Z","related":["SUSE-SU-2026:22433-1","SUSE-SU-2026:22436-1","SUSE-SU-2026:22458-1","SUSE-SU-2026:22460-1","SUSE-SU-2026:2722-1","SUSE-SU-2026:2799-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43405.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43405.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43405"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c"},{"fixed":"ee5588e2bc41acb73f6676c0520420c107cd0140"},{"fixed":"86f7060cd638d6eb042e8ed780fb83a59ca0dcb3"},{"fixed":"5f2806684b05bd24d05c091083b8e2517ba8ffac"},{"fixed":"b268984ae88cb0dcd7a8e8263962c748448e26e8"},{"fixed":"ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace"},{"fixed":"08bc6173fd611ad5a40f472bf5f15b92aea0fe40"},{"fixed":"770444611f047dbfd4517ec0bc1b179d40c2f346"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43405.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.167"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.130"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43405.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}