{"api_version":"1","generated_at":"2026-05-11T11:03:43+00:00","cve":"CVE-2026-43405","urls":{"html":"https://cve.report/CVE-2026-43405","api":"https://cve.report/api/cve/CVE-2026-43405.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43405","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43405"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-05-08 15:16:52","updated_at":"2026-05-11 08:16:13"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3","name":"https://git.kernel.org/stable/c/86f7060cd638d6eb042e8ed780fb83a59ca0dcb3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346","name":"https://git.kernel.org/stable/c/770444611f047dbfd4517ec0bc1b179d40c2f346","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace","name":"https://git.kernel.org/stable/c/ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140","name":"https://git.kernel.org/stable/c/ee5588e2bc41acb73f6676c0520420c107cd0140","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac","name":"https://git.kernel.org/stable/c/5f2806684b05bd24d05c091083b8e2517ba8ffac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8","name":"https://git.kernel.org/stable/c/b268984ae88cb0dcd7a8e8263962c748448e26e8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40","name":"https://git.kernel.org/stable/c/08bc6173fd611ad5a40f472bf5f15b92aea0fe40","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43405","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43405","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c ee5588e2bc41acb73f6676c0520420c107cd0140 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c 86f7060cd638d6eb042e8ed780fb83a59ca0dcb3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c 5f2806684b05bd24d05c091083b8e2517ba8ffac git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c b268984ae88cb0dcd7a8e8263962c748448e26e8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.78 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.19 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.9 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"43405","cve":"CVE-2026-43405","epss":"0.000240000","percentile":"0.070400000","score_date":"2026-05-10","updated_at":"2026-05-11 00:14:41"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ee5588e2bc41acb73f6676c0520420c107cd0140","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"},{"lessThan":"86f7060cd638d6eb042e8ed780fb83a59ca0dcb3","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"},{"lessThan":"5f2806684b05bd24d05c091083b8e2517ba8ffac","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"},{"lessThan":"b268984ae88cb0dcd7a8e8263962c748448e26e8","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"},{"lessThan":"ba0a4df8c563536857dcbf7b4dbd0f2a15f57ace","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"},{"lessThan":"08bc6173fd611ad5a40f472bf5f15b92aea0fe40","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"},{"lessThan":"770444611f047dbfd4517ec0bc1b179d40c2f346","status":"affected","version":"a5cbd5fc22d5043a8a76e15d75d031fe24d1f69c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ceph/mon_client.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.11"},{"lessThan":"5.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.78","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.19","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.78","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.19","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.9","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"5.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-11T06:34:13.538Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43405","datePublished":"2026-05-08T14:21:45.581Z","dateReserved":"2026-05-01T14:12:56.007Z","dateUpdated":"2026-05-11T06:34:13.538Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-08 15:16:52","lastModifiedDate":"2026-05-11 08:16:13","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43405","Ordinal":"1","Title":"libceph: Use u32 for non-negative values in ceph_monmap_decode()","CVE":"CVE-2026-43405","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43405","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"libceph: Use u32 for non-negative values in ceph_monmap_decode()"}]}}}