{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80558", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.767Z", "datePublished": "2026-08-26T14:37:24.768Z", "dateUpdated": "2026-08-27T05:01:46.707Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T05:01:46.707Z" }, "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 ]" } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/osdmap.c" ], "versions": [ { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "505fc50b8ff8e687b7e3ef6866269dea27366224", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "1c705fe8e59c6b16f48964973fb23c8ec4735b73", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "dfe1877d351b99eb1b1a62a3fc2d174220e88e20", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "e2ffeec85201b2bb748e99e12539ee1b92f62796", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "6799d4a916ffcb3d450d8440f9fe0f0862f768d6", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "4f392fec075562dc93bb0c69f37423ca2af9b48f", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "e009c5f0ad634c62f5c48a41f1f3c019ecf52555", "status": "affected", "versionType": "git" }, { "version": "5e8d4d36bf23bb7baf027c479d54395840219928", "lessThan": "3660b98d1204b419f6a77e9a295f148dcf38d042", "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/osdmap.c" ], "versions": [ { "version": "3.15", "status": "affected" }, { "version": "0", "lessThan": "3.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.153", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.105", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "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" } ] } ] } ], "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" } } } }