{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43405","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.007Z","datePublished":"2026-05-08T14:21:45.581Z","dateUpdated":"2026-05-11T22:23:56.777Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:23:56.777Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ceph/mon_client.c"],"versions":[{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"ee5588e2bc41acb73f6676c0520420c107cd0140","status":"affected","versionType":"git"},{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"86f7060cd638d6eb042e8ed780fb83a59ca0dcb3","status":"affected","versionType":"git"},{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"5f2806684b05bd24d05c091083b8e2517ba8ffac","status":"affected","versionType":"git"},{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"b268984ae88cb0dcd7a8e8263962c748448e26e8","status":"affected","versionType":"git"},{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace","status":"affected","versionType":"git"},{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"08bc6173fd611ad5a40f472bf5f15b92aea0fe40","status":"affected","versionType":"git"},{"version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","lessThan":"770444611f047dbfd4517ec0bc1b179d40c2f346","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ceph/mon_client.c"],"versions":[{"version":"5.11","status":"affected"},{"version":"0","lessThan":"5.11","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.19","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.9","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140"},{"url":"https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3"},{"url":"https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac"},{"url":"https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8"},{"url":"https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace"},{"url":"https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40"},{"url":"https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346"}],"title":"libceph: Use u32 for non-negative values in ceph_monmap_decode()","x_generator":{"engine":"bippy-1.2.0"}}}}