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CVE-2026-68082 (GCVE-0-2026-68082)

Vulnerability from cvelistv5 – Published: 2026-08-08 09:17 – Updated: 2026-08-23 12:45
VLAI
Title
libceph: fix two unsafe bare decodes in decode_lockers()
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: fix two unsafe bare decodes in decode_lockers() decode_lockers() in cls_lock_client.c contains two bare decode operations that allow a malicious or compromised OSD to trigger slab-out-of-bounds reads: 1. ceph_decode_32(p) at the num_lockers field has no preceding bounds check. ceph_start_decoding() accepts struct_len=0 as valid -- the internal ceph_decode_need(p, end, 0, bad) always passes -- so when an OSD sends struct_len=0, ceph_start_decoding() returns success with p == end. The immediately following bare ceph_decode_32(p) then reads 4 bytes past the validated buffer boundary. The garbage value is passed directly to kzalloc_objs() as the locker count. The sibling function decode_watchers() in osd_client.c already uses ceph_decode_32_safe() after its own ceph_start_decoding() call. decode_lockers() was the only site using the bare variant. 2. ceph_decode_8(p) after the decode_locker() loop has no preceding bounds check. If an OSD crafts num_lockers such that the loop advances p exactly to end, the subsequent bare ceph_decode_8(p) reads one byte past the validated buffer boundary. The result is passed directly into *type, which is used as a lock type discriminator by callers, giving an OSD-controlled one-byte OOB read with direct influence over the lock type field. Fix both by replacing bare operations with their safe variants: ceph_decode_32(p) -> ceph_decode_32_safe(p, end, *num_lockers, err_inval) ceph_decode_8(p) -> ceph_decode_8_safe(p, end, *type, err_free_lockers) The goto targets differ intentionally: err_inval: is a new label returning -EINVAL directly. It is used for the pre-allocation failure path where *lockers is not yet allocated and must not be passed to ceph_free_lockers(). err_free_lockers: is the existing label. It is used for the post-allocation failure path where *lockers is allocated and must be freed. ret is set to -EINVAL before ceph_decode_8_safe() so that err_free_lockers returns the correct error code on bounds violation. Without this, err_free_lockers would return a stale ret value (0 from the successful decode_locker() loop), silently swallowing the error. -EINVAL is correct for both failure paths. The data received from the OSD is structurally malformed. -ENOMEM would misrepresent the failure class to callers and to stable@ backporters triaging error paths. Attacker model: a malicious or compromised OSD in a multi-tenant Ceph deployment can trigger this against any kernel client that issues the lock.get_info class method (e.g. during RBD exclusive lock acquisition). [ idryomov: trim changelog, formatting ]
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: d4ed4a530562881cc5225050e42d96034f405aae , < c8ade01170a27d8ede0d761c255268af81e417f8 (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < 001835c599899ef1bd3506a815110a6374451554 (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < 7c422364acd93d7da1dfc27d6b54635a269653a1 (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < 02430f6f729b297e803d0605871f0a670b4eafd6 (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < 57ba829804fe6d34bbac3b826c4b15c1caa54862 (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < 89df5d71f83f8e2781286798fd8ae5e42cf5f1a7 (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < a54be593d0b749161b08a1e56189b2cb9114267a (git)
Affected: d4ed4a530562881cc5225050e42d96034f405aae , < a109a556115271ca7896dcda7b4b7e45e156c227 (git)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (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: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: fix two unsafe bare decodes in decode_lockers()\n\ndecode_lockers() in cls_lock_client.c contains two bare decode operations\nthat allow a malicious or compromised OSD to trigger slab-out-of-bounds\nreads:\n\n1. ceph_decode_32(p) at the num_lockers field has no preceding bounds\n   check. ceph_start_decoding() accepts struct_len=0 as valid -- the\n   internal ceph_decode_need(p, end, 0, bad) always passes -- so when an\n   OSD sends struct_len=0, ceph_start_decoding() returns success with\n   p == end. The immediately following bare ceph_decode_32(p) then reads\n   4 bytes past the validated buffer boundary. The garbage value is\n   passed directly to kzalloc_objs() as the locker count.\n\n   The sibling function decode_watchers() in osd_client.c already uses\n   ceph_decode_32_safe() after its own ceph_start_decoding() call.\n   decode_lockers() was the only site using the bare variant.\n\n2. ceph_decode_8(p) after the decode_locker() loop has no preceding\n   bounds check. If an OSD crafts num_lockers such that the loop\n   advances p exactly to end, the subsequent bare ceph_decode_8(p) reads\n   one byte past the validated buffer boundary. The result is passed\n   directly into *type, which is used as a lock type discriminator by\n   callers, giving an OSD-controlled one-byte OOB read with direct\n   influence over the lock type field.\n\nFix both by replacing bare operations with their safe variants:\n  ceph_decode_32(p) -\u003e ceph_decode_32_safe(p, end, *num_lockers,\n                                           err_inval)\n  ceph_decode_8(p)  -\u003e ceph_decode_8_safe(p, end, *type,\n                                          err_free_lockers)\n\nThe goto targets differ intentionally:\n  err_inval: is a new label returning -EINVAL directly. It is used for\n  the pre-allocation failure path where *lockers is not yet allocated\n  and must not be passed to ceph_free_lockers().\n\n  err_free_lockers: is the existing label. It is used for the\n  post-allocation failure path where *lockers is allocated and must\n  be freed.\n\nret is set to -EINVAL before ceph_decode_8_safe() so that\nerr_free_lockers returns the correct error code on bounds violation.\nWithout this, err_free_lockers would return a stale ret value (0 from\nthe successful decode_locker() loop), silently swallowing the error.\n\n-EINVAL is correct for both failure paths. The data received from the\nOSD is structurally malformed. -ENOMEM would misrepresent the failure\nclass to callers and to stable@ backporters triaging error paths.\n\nAttacker model: a malicious or compromised OSD in a multi-tenant Ceph\ndeployment can trigger this against any kernel client that issues the\nlock.get_info class method (e.g. during RBD exclusive lock acquisition).\n\n[ idryomov: trim changelog, formatting ]"
        }
      ],
      "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 - The flaw is reached when libceph decodes a crafted MOSDOpReply for the lock.get_info class method received over the Ceph messenger TCP session from a compromised or malicious OSD; no local syscall or ioctl is required on the victim.\nAC:L - A malicious OSD can deterministically send struct_len=0 or craft num_lockers so the decode pointer reaches end, triggering both bare decodes on every attempt without races, special memory layout, or rare kernel configuration.\nPR:N - The attacker acts as the remote Ceph OSD peer and needs no account or privileges on the victim Linux host; any kernel RBD client connected to a multi-tenant or attacker-controlled cluster is exposed during automatic exclusive-lock operations.\nUI:N - Once an RBD image is mapped, ceph_cls_lock_info() is invoked automatically during exclusive-lock acquisition and object-map lock recovery; no further victim user or administrator action is required at exploit time.\nS:U - The slab out-of-bounds reads and any resulting kernel memory corruption occur entirely within the victim host kernel running the Ceph client, without crossing VM, container, or IOMMU security boundaries.\nC:H - Bare ceph_decode_32/8 past the validated reply boundary perform slab out-of-bounds reads of adjacent kernel memory; the leaked u32 can drive kzalloc_objs() sizing and the OOB u8 directly controls the lock-type field consumed by RBD lock logic.\nI:H - Attacker-influenced out-of-bounds values feed heap allocation sizing and lock-type discrimination in kernel lock-handling paths, providing memory-corruption primitives in a privileged parser that can be leveraged beyond simple information disclosure.\nA:H - Slab out-of-bounds reads can trigger KASAN faults or kernel oops on instrumented builds, and attacker-controlled locker counts can force very large kzalloc attempts causing severe memory pressure, OOM conditions, and loss of availability on RBD client hosts."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:46.891Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c8ade01170a27d8ede0d761c255268af81e417f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/001835c599899ef1bd3506a815110a6374451554"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c422364acd93d7da1dfc27d6b54635a269653a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/02430f6f729b297e803d0605871f0a670b4eafd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/57ba829804fe6d34bbac3b826c4b15c1caa54862"
        },
        {
          "url": "https://git.kernel.org/stable/c/89df5d71f83f8e2781286798fd8ae5e42cf5f1a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/a54be593d0b749161b08a1e56189b2cb9114267a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a109a556115271ca7896dcda7b4b7e45e156c227"
        }
      ],
      "title": "libceph: fix two unsafe bare decodes in decode_lockers()",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68082",
    "datePublished": "2026-08-08T09:17:45.394Z",
    "dateReserved": "2026-07-30T09:28:09.367Z",
    "dateUpdated": "2026-08-23T12:45:46.891Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68082",
      "date": "2026-09-15",
      "epss": "0.00399",
      "percentile": "0.33536"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-09T01:02:46.000Z",
      "cve": "CVE-2026-68082",
      "id": "msrc_CVE-2026-68082",
      "initial_release_date": "2026-08-09T01:02:46.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "libceph: fix two unsafe bare decodes in decode_lockers()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-68082.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68082\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-08T10:16:55.377\",\"lastModified\":\"2026-08-23T13:16:32.583\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nlibceph: fix two unsafe bare decodes in decode_lockers()\\n\\ndecode_lockers() in cls_lock_client.c contains two bare decode operations\\nthat allow a malicious or compromised OSD to trigger slab-out-of-bounds\\nreads:\\n\\n1. ceph_decode_32(p) at the num_lockers field has no preceding bounds\\n   check. ceph_start_decoding() accepts struct_len=0 as valid -- the\\n   internal ceph_decode_need(p, end, 0, bad) always passes -- so when an\\n   OSD sends struct_len=0, ceph_start_decoding() returns success with\\n   p == end. The immediately following bare ceph_decode_32(p) then reads\\n   4 bytes past the validated buffer boundary. The garbage value is\\n   passed directly to kzalloc_objs() as the locker count.\\n\\n   The sibling function decode_watchers() in osd_client.c already uses\\n   ceph_decode_32_safe() after its own ceph_start_decoding() call.\\n   decode_lockers() was the only site using the bare variant.\\n\\n2. ceph_decode_8(p) after the decode_locker() loop has no preceding\\n   bounds check. If an OSD crafts num_lockers such that the loop\\n   advances p exactly to end, the subsequent bare ceph_decode_8(p) reads\\n   one byte past the validated buffer boundary. The result is passed\\n   directly into *type, which is used as a lock type discriminator by\\n   callers, giving an OSD-controlled one-byte OOB read with direct\\n   influence over the lock type field.\\n\\nFix both by replacing bare operations with their safe variants:\\n  ceph_decode_32(p) -\u003e ceph_decode_32_safe(p, end, *num_lockers,\\n                                           err_inval)\\n  ceph_decode_8(p)  -\u003e ceph_decode_8_safe(p, end, *type,\\n                                          err_free_lockers)\\n\\nThe goto targets differ intentionally:\\n  err_inval: is a new label returning -EINVAL directly. It is used for\\n  the pre-allocation failure path where *lockers is not yet allocated\\n  and must not be passed to ceph_free_lockers().\\n\\n  err_free_lockers: is the existing label. It is used for the\\n  post-allocation failure path where *lockers is allocated and must\\n  be freed.\\n\\nret is set to -EINVAL before ceph_decode_8_safe() so that\\nerr_free_lockers returns the correct error code on bounds violation.\\nWithout this, err_free_lockers would return a stale ret value (0 from\\nthe successful decode_locker() loop), silently swallowing the error.\\n\\n-EINVAL is correct for both failure paths. The data received from the\\nOSD is structurally malformed. -ENOMEM would misrepresent the failure\\nclass to callers and to stable@ backporters triaging error paths.\\n\\nAttacker model: a malicious or compromised OSD in a multi-tenant Ceph\\ndeployment can trigger this against any kernel client that issues the\\nlock.get_info class method (e.g. during RBD exclusive lock acquisition).\\n\\n[ idryomov: trim changelog, formatting ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ceph/cls_lock_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"c8ade01170a27d8ede0d761c255268af81e417f8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"001835c599899ef1bd3506a815110a6374451554\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"7c422364acd93d7da1dfc27d6b54635a269653a1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"02430f6f729b297e803d0605871f0a670b4eafd6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"57ba829804fe6d34bbac3b826c4b15c1caa54862\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"89df5d71f83f8e2781286798fd8ae5e42cf5f1a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"a54be593d0b749161b08a1e56189b2cb9114267a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d4ed4a530562881cc5225050e42d96034f405aae\",\"lessThan\":\"a109a556115271ca7896dcda7b4b7e45e156c227\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ceph/cls_lock_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"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}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/001835c599899ef1bd3506a815110a6374451554\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/02430f6f729b297e803d0605871f0a670b4eafd6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/57ba829804fe6d34bbac3b826c4b15c1caa54862\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c422364acd93d7da1dfc27d6b54635a269653a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89df5d71f83f8e2781286798fd8ae5e42cf5f1a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a109a556115271ca7896dcda7b4b7e45e156c227\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a54be593d0b749161b08a1e56189b2cb9114267a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8ade01170a27d8ede0d761c255268af81e417f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:43:24Z",
      "cve": "CVE-2026-68082",
      "id": "CVE-2026-68082",
      "initial_release_date": "2026-08-08T23:29:10Z",
      "product_status:first_fixed": "88",
      "product_status:known_affected": "743",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68082",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68082.json",
      "version": "9"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.