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libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE __decode_pg_temp() decodes an user-controlled length but only rejects values large enough to overflow the allocation; it does not bound it to CEPH_PG_MAX_SIZE. The helper backs both pg_temp and pg_upmap decoding, and apply_upmap()/get_temp_osds() later copy the decoded list into the fixed-size on-stack array struct ceph_osds.osds[CEPH_PG_MAX_SIZE]. A monitor that sends an OSDMap with a pg_temp/pg_upmap entry longer than 32 thus causes a stack out-of-bounds write. An OSD set for a single PG can never exceed CEPH_PG_MAX_SIZE, so reject longer entries at decode time. The bound is well below the old overflow threshold, so it also covers the allocation-size overflow the previous check guarded against. BUG: KASAN: stack-out-of-bounds in ceph_pg_to_up_acting_osds Write of size 4 ... by task exploit kasan_report (mm/kasan/report.c:595) ceph_pg_to_up_acting_osds (net/ceph/osdmap.c:2617 net/ceph/osdmap.c:2833) calc_target (net/ceph/osd_client.c:1638) __submit_request (net/ceph/osd_client.c:2394) ceph_osdc_start_request (net/ceph/osd_client.c:2490) ceph_osdc_call (net/ceph/osd_client.c:5164) rbd_dev_image_probe (drivers/block/rbd.c:6899) do_rbd_add (drivers/block/rbd.c:7138) ... kernel BUG at net/ceph/osdmap.c:2670! [ idryomov: do the same in __decode_pg_upmap_items() ]

Announced Source revision 1
Original source ↗

CVE-2026-68159

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68159

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
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Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "66eec4af1e080b695229c9a20635648a6d12fedf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "4daf06456677177f2a6044729abac59c1b49e87b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "42bc06c67d94d5f2a6b33294b0c4b07d8a47c515",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "ebdf4b4f3b1474079980a2e5cd79ad65fb54db57",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "590b07ceea138d49c9b64f65d263aa902d3b4730",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "e36663145abd7024f0281dfb22fdef65f185845b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a303bb0e58345fe9f7ab2f82b90266f2b5036058",
        "lessThan": "9f00f9cf2be293efe899db67dc5272e3a9c62717",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ceph/osdmap.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.13"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.13",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.153",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ceph/osdmap.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68159

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41147 · Revision 1
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Publisher date
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