CVE-2026-80558 (GCVE-0-2026-80558)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
Title
libceph: Avoid using invalid osd indices from primary_temp
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: Avoid using invalid osd indices from primary_temp A corrupted osdmap received from a Ceph monitor or OSD may contain osd indices in its pg_temp, primary_temp, pg_upmap, and pg_upmap_items parts that don't exist, i.e., that are greater than max_osd or smaller than CEPH_HOMELESS_OSD (-1). These indices are used to create the up and acting set in ceph_pg_to_up_acting_osds(), called from calc_target(). While most of these osd indices are checked, the one from primary_temp is not. Subsequently, this may lead to calc_target() returning this (potentially invalid) index as target osd for a (linger) request. Because the osd_state, osd_weight, and osd_addr arrays only contain max_osd entries (with indices 0 to max_osd -1), this leads to out-of-bounds accesses when trying to read values from these arrays. This patch fixes the issue by adding a check to get_temp_osds(), so that only valid osd indices from primary_temp are used, and it falls back to using the primary from pg_temp or the up set if it is invalid. [ idryomov: changelog ]
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < 505fc50b8ff8e687b7e3ef6866269dea27366224 (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < 1c705fe8e59c6b16f48964973fb23c8ec4735b73 (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < dfe1877d351b99eb1b1a62a3fc2d174220e88e20 (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < e2ffeec85201b2bb748e99e12539ee1b92f62796 (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < 6799d4a916ffcb3d450d8440f9fe0f0862f768d6 (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < 4f392fec075562dc93bb0c69f37423ca2af9b48f (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < e009c5f0ad634c62f5c48a41f1f3c019ecf52555 (git)
Affected: 5e8d4d36bf23bb7baf027c479d54395840219928 , < 3660b98d1204b419f6a77e9a295f148dcf38d042 (git)
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Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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\u0027t 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 ]"
        }
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
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              "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 \u003e= 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."
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    "dateReserved": "2026-08-26T14:34:25.767Z",
    "dateUpdated": "2026-08-27T05:01:46.707Z",
    "state": "PUBLISHED"
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T09:43:59+00:00",
      "cve": "CVE-2026-80558",
      "id": "CVE-2026-80558",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: Avoid using invalid osd indices from primary_temp",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80558.json",
      "version": "3"
    }
  }
}



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