{"api_version":"1","generated_at":"2026-09-01T11:20:26+00:00","cve":"CVE-2026-80558","urls":{"html":"https://cve.report/CVE-2026-80558","api":"https://cve.report/api/cve/CVE-2026-80558.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80558","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80558"},"summary":{"title":"libceph: Avoid using invalid osd indices from primary_temp","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Avoid using invalid osd indices from primary_temp\n\nA corrupted osdmap received from a Ceph monitor or OSD may contain osd\nindices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts\nthat don't exist, i.e., that are greater than max_osd or smaller than\nCEPH_HOMELESS_OSD (-1). These indices are used to create the up and\nacting set in ceph_pg_to_up_acting_osds(), called from calc_target().\nWhile most of these osd indices are checked, the one from primary_temp\nis not. Subsequently, this may lead to calc_target() returning this\n(potentially invalid) index as target osd for a (linger) request.\nBecause the osd_state, osd_weight, and osd_addr arrays only contain\nmax_osd entries (with indices 0 to max_osd -1), this leads to\nout-of-bounds accesses when trying to read values from these arrays.\n\nThis patch fixes the issue by adding a check to get_temp_osds(), so that\nonly valid osd indices from primary_temp are used, and it falls back to\nusing the primary from pg_temp or the up set if it is invalid.\n\n[ idryomov: changelog ]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-26 15:17:10","updated_at":"2026-08-27 06:17:39"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f","name":"https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042","name":"https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6","name":"https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224","name":"https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73","name":"https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555","name":"https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20","name":"https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796","name":"https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80558","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80558","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e8d4d36bf23bb7baf027c479d54395840219928 505fc50b8ff8e687b7e3ef6866269dea27366224 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e8d4d36bf23bb7baf027c479d54395840219928 1c705fe8e59c6b16f48964973fb23c8ec4735b73 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e8d4d36bf23bb7baf027c479d54395840219928 dfe1877d351b99eb1b1a62a3fc2d174220e88e20 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5e8d4d36bf23bb7baf027c479d54395840219928 e2ffeec85201b2bb748e99e12539ee1b92f62796 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.217 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.184 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.153 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.105 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.46 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.10 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80558","cve":"CVE-2026-80558","epss":"0.005210000","percentile":"0.420410000","score_date":"2026-08-27","updated_at":"2026-08-28 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the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Avoid using invalid osd indices from primary_temp\n\nA corrupted osdmap received from a Ceph monitor or OSD may contain osd\nindices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts\nthat don't exist, i.e., that are greater than max_osd or smaller than\nCEPH_HOMELESS_OSD (-1). These indices are used to create the up and\nacting set in ceph_pg_to_up_acting_osds(), called from calc_target().\nWhile most of these osd indices are checked, the one from primary_temp\nis not. Subsequently, this may lead to calc_target() returning this\n(potentially invalid) index as target osd for a (linger) request.\nBecause the osd_state, osd_weight, and osd_addr arrays only contain\nmax_osd entries (with indices 0 to max_osd -1), this leads to\nout-of-bounds accesses when trying to read values from these arrays.\n\nThis patch fixes the issue by adding a check to get_temp_osds(), so that\nonly valid osd indices from primary_temp are used, and it falls back to\nusing the primary from pg_temp or the up set if it is invalid.\n\n[ idryomov: changelog ]"}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - Malformed primary_temp data arrives in CEPH_MSG_OSD_MAP over TCP from a Ceph monitor (mon_dispatch) or OSD (osd_dispatch); calc_target() then uses the bogus osd index in lookup_create_osd()/reopen_osd() to index osd_addr/osd_state/osd_weight without any local syscall.\nAC:L - A compromised or malicious monitor/OSD can publish an incremental osdmap whose primary_temp sets an osd index >= max_osd for a victim PG; once applied, calc_target() on pending I/O, linger requests, or map-driven resends deterministically uses that invalid index.\nPR:N - The attacker acts as the remote Ceph cluster peer delivering forged osdmaps to an already-connected kernel CephFS/RBD client and needs no local account, capabilities, or user-namespace privileges on the victim host.\nUI:N - Once a kernel Ceph client session exists, osdmap updates are applied automatically and scan_requests/kick_requests recalculate targets without any mount, open, or other victim interaction at exploit time.\nS:U - Impact is confined to kernel libceph client memory and state on the Ceph client host (heap disclosure, misrouted connections, crash); it does not cross VM, IOMMU, or container sandbox boundaries to another security authority.\nC:H - Invalid acting.primary indexes past the end of kmalloc-backed osd_addr, osd_state, and osd_weight arrays, performing out-of-bounds reads of adjacent kernel heap memory that can disclose pointers and other sensitive data.\nI:H - Attacker-chosen osd indices drive out-of-bounds reads whose results are treated as authoritative OSD addresses and state for ceph_con_open() and request routing, corrupting kernel client connection targeting in ways usable for further exploitation.\nA:H - Out-of-bounds reads with large crafted osd indices can fault on unmapped kmalloc slack and trigger kernel oops or panic; misrouted linger and I/O requests also cause persistent, repeatable client failure on each malicious osdmap update."}]}],"providerMetadata":{"dateUpdated":"2026-08-27T05:01:46.707Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224"},{"url":"https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73"},{"url":"https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20"},{"url":"https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796"},{"url":"https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6"},{"url":"https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f"},{"url":"https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555"},{"url":"https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042"}],"title":"libceph: Avoid using invalid osd indices from primary_temp","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80558","datePublished":"2026-08-26T14:37:24.768Z","dateReserved":"2026-08-26T14:34:25.767Z","dateUpdated":"2026-08-27T05:01:46.707Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-26 15:17:10","lastModifiedDate":"2026-08-27 06:17:39","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:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80558","Ordinal":"1","Title":"libceph: Avoid using invalid osd indices from primary_temp","CVE":"CVE-2026-80558","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80558","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: Avoid using invalid osd indices from primary_temp\n\nA corrupted osdmap received from a Ceph monitor or OSD may contain osd\nindices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts\nthat don't exist, i.e., that are greater than max_osd or smaller than\nCEPH_HOMELESS_OSD (-1). These indices are used to create the up and\nacting set in ceph_pg_to_up_acting_osds(), called from calc_target().\nWhile most of these osd indices are checked, the one from primary_temp\nis not. Subsequently, this may lead to calc_target() returning this\n(potentially invalid) index as target osd for a (linger) request.\nBecause the osd_state, osd_weight, and osd_addr arrays only contain\nmax_osd entries (with indices 0 to max_osd -1), this leads to\nout-of-bounds accesses when trying to read values from these arrays.\n\nThis patch fixes the issue by adding a check to get_temp_osds(), so that\nonly valid osd indices from primary_temp are used, and it falls back to\nusing the primary from pg_temp or the up set if it is invalid.\n\n[ idryomov: changelog ]","Type":"Description","Title":"libceph: Avoid using invalid osd indices from primary_temp"}]}}}