{"id":"CVE-2026-80558","state":"PUBLISHED","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 ]","publishedAt":"2026-08-26T14:37:24.768Z","updatedAt":"2026-10-16T19:26:27.095Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"505fc50b8ff8e687b7e3ef6866269dea27366224","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"1c705fe8e59c6b16f48964973fb23c8ec4735b73","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"dfe1877d351b99eb1b1a62a3fc2d174220e88e20","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"e2ffeec85201b2bb748e99e12539ee1b92f62796","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"6799d4a916ffcb3d450d8440f9fe0f0862f768d6","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"4f392fec075562dc93bb0c69f37423ca2af9b48f","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"e009c5f0ad634c62f5c48a41f1f3c019ecf52555","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"3660b98d1204b419f6a77e9a295f148dcf38d042","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ceph/osdmap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.184","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.153","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.46","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.10","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ceph/osdmap.c"]}],"references":["https://git.kernel.org/stable/c/505fc50b8ff8e687b7e3ef6866269dea27366224","https://git.kernel.org/stable/c/1c705fe8e59c6b16f48964973fb23c8ec4735b73","https://git.kernel.org/stable/c/dfe1877d351b99eb1b1a62a3fc2d174220e88e20","https://git.kernel.org/stable/c/e2ffeec85201b2bb748e99e12539ee1b92f62796","https://git.kernel.org/stable/c/6799d4a916ffcb3d450d8440f9fe0f0862f768d6","https://git.kernel.org/stable/c/4f392fec075562dc93bb0c69f37423ca2af9b48f","https://git.kernel.org/stable/c/e009c5f0ad634c62f5c48a41f1f3c019ecf52555","https://git.kernel.org/stable/c/3660b98d1204b419f6a77e9a295f148dcf38d042"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80558.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80558","state":"PUBLISHED","datePublished":"2026-08-26T14:37:24.768Z","dateUpdated":"2026-10-16T19:26:27.095Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.767Z"},"containers":{"cna":{"title":"libceph: Avoid using invalid osd indices from primary_temp","descriptions":[{"lang":"en","value":"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 ]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"505fc50b8ff8e687b7e3ef6866269dea27366224","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"1c705fe8e59c6b16f48964973fb23c8ec4735b73","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"dfe1877d351b99eb1b1a62a3fc2d174220e88e20","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"e2ffeec85201b2bb748e99e12539ee1b92f62796","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"6799d4a916ffcb3d450d8440f9fe0f0862f768d6","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"4f392fec075562dc93bb0c69f37423ca2af9b48f","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"e009c5f0ad634c62f5c48a41f1f3c019ecf52555","versionType":"git"},{"version":"5e8d4d36bf23bb7baf027c479d54395840219928","status":"affected","lessThan":"3660b98d1204b419f6a77e9a295f148dcf38d042","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ceph/osdmap.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.184","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.153","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.46","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.10","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ceph/osdmap.c"]}],"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"}],"metrics":[{"cvssV3_1":{"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"},"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":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-27T05:01:46.707Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.1.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-80558","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:17:27.873915Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:26:27.095Z"}}]}}}