CVE-2026-68131 (GCVE-0-2026-68131)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-19 16:29
VLAI
Title
rbd: Reset positive result codes to zero in object map update path
Summary
In the Linux kernel, the following vulnerability has been resolved: rbd: Reset positive result codes to zero in object map update path In a reply message to an RBD request, a positive result code indicates a data payload, which is not allowed for writes. While rbd_osd_req_callback() already resets a positive result code for writes to zero, rbd_object_map_callback() does not. This allows a corrupted reply to an object map update to trigger the rbd_assert(*result < 0) in __rbd_obj_handle_request(). This happens, because rbd_object_map_callback() calls rbd_obj_handle_request() -> __rbd_obj_handle_request() and passes this positive result code. From __rbd_obj_handle_request(), rbd_obj_advance_write() is called, which leaves the positive result code unchanged and returns true. Therefore, the if(done && *result) branch is executed in __rbd_obj_handle_request() and the assertion triggers. This patch fixes the issue by adjusting the logic in the rbd_object_map_callback() path. A positive result code for an object map update is now reset to zero (similar to rbd_osd_req_callback()), and the message is subsequently handled the same way as if the result code was zero from the beginning. Additionally, a WARN_ON_ONCE() is added for this case.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < cf1167292f606deaddac35ec384eba48f08a68d2 (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < da926959bf791441ba06a80571708c3d0d3cc08f (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < 6f33d9d539fb94e5a17589c2dfe271ff9bb64904 (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < 14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < 2419aa74081007dc4d14ff5640659052dfdfd69a (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < 34f2a2f32af570dfcc532ad70c080629ee1c32b0 (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < b1a61366933224b3ad80975c4d01ac2cc6931ecf (git)
Affected: 22e8bd51bb0469d1a524130a057f894ff632376a , < a6c4250b81bd30beae94e1b7a4b26fa1193ad2e4 (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrbd: Reset positive result codes to zero in object map update path\n\nIn a reply message to an RBD request, a positive result code indicates\na data payload, which is not allowed for writes. While\nrbd_osd_req_callback() already resets a positive result code for writes\nto zero, rbd_object_map_callback() does not. This allows a corrupted\nreply to an object map update to trigger the rbd_assert(*result \u003c 0) in\n__rbd_obj_handle_request(). This happens, because\nrbd_object_map_callback() calls rbd_obj_handle_request() -\u003e\n__rbd_obj_handle_request() and passes this positive result code. From\n__rbd_obj_handle_request(), rbd_obj_advance_write() is called, which\nleaves the positive result code unchanged and returns true. Therefore,\nthe if(done \u0026\u0026 *result) branch is executed in __rbd_obj_handle_request()\nand the assertion triggers.\n\nThis patch fixes the issue by adjusting the logic in the\nrbd_object_map_callback() path. A positive result code for an object map\nupdate is now reset to zero (similar to rbd_osd_req_callback()), and the\nmessage is subsequently handled the same way as if the result code was\nzero from the beginning. Additionally, a WARN_ON_ONCE() is added for\nthis case."
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            "version": "3.1"
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              "value": "AV:N - The crash is triggered when libceph processes a crafted MOSDOpReply over the Ceph TCP connection and passes a positive r_result into rbd_object_map_callback(); a compromised or malicious OSD/monitor peer can deliver this without any local syscall on the victim.\nAC:L - An attacker controlling the Ceph OSD can deterministically reply to any object-map update request with a positive result code whenever the mapped image has RBD_FEATURE_OBJECT_MAP and write I/O is in flight, with no race or victim-specific memory layout required.\nPR:N - No privileges on the victim host are needed; exploitation only requires the kernel RBD client to be connected to an attacker-controlled or compromised Ceph cluster, consistent with other libceph client CVE scoring where the remote storage peer drives the bug.\nUI:N - After RBD is mapped, object-map updates are driven automatically by block-layer write I/O; no further interactive user action is required at exploit time beyond normal background storage activity on the mapped device.\nS:U - The BUG() panic affects only the kernel on the host running the RBD client and does not cross VM, container, or IOMMU security boundaries to another authority.\nC:N - The vulnerable path returns immediately on a positive result without decoding reply payload or corrupting memory; impact is limited to an assertion failure with no information disclosure primitive.\nI:N - No kernel or user data is modified; the positive result code is mishandled and triggers rbd_assert(*result \u003c 0) leading to BUG(), not an arbitrary write or code-execution primitive.\nA:H - RBD_DEBUG is unconditionally defined so rbd_assert() invokes BUG(), causing a kernel panic that fully denies availability on any host with an affected RBD mapping when a malicious OSD reply is received."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "rbd: Reset positive result codes to zero in object map update path",
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    "cveId": "CVE-2026-68131",
    "datePublished": "2026-08-10T11:58:54.155Z",
    "dateReserved": "2026-07-30T09:28:09.370Z",
    "dateUpdated": "2026-08-19T16:29:49.752Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrbd: Reset positive result codes to zero in object map update path\n\nIn a reply message to an RBD request, a positive result code indicates\na data payload, which is not allowed for writes. While\nrbd_osd_req_callback() already resets a positive result code for writes\nto zero, rbd_object_map_callback() does not. This allows a corrupted\nreply to an object map update to trigger the rbd_assert(*result \u003c 0) in\n__rbd_obj_handle_request(). This happens, because\nrbd_object_map_callback() calls rbd_obj_handle_request() -\u003e\n__rbd_obj_handle_request() and passes this positive result code. From\n__rbd_obj_handle_request(), rbd_obj_advance_write() is called, which\nleaves the positive result code unchanged and returns true. Therefore,\nthe if(done \u0026\u0026 *result) branch is executed in __rbd_obj_handle_request()\nand the assertion triggers.\n\nThis patch fixes the issue by adjusting the logic in the\nrbd_object_map_callback() path. A positive result code for an object map\nupdate is now reset to zero (similar to rbd_osd_req_callback()), and the\nmessage is subsequently handled the same way as if the result code was\nzero from the beginning. Additionally, a WARN_ON_ONCE() is added for\nthis case."
          }
        ],
        "id": "CVE-2026-68131",
        "lastModified": "2026-08-19T17:20:30.607",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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        },
        "published": "2026-08-10T13:19:58.460",
        "references": [
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            "url": "https://git.kernel.org/stable/c/14995c4250f04b58bf6fc00e0e973a2e1b3cfb9b"
          },
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            "url": "https://git.kernel.org/stable/c/da926959bf791441ba06a80571708c3d0d3cc08f"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:16:55+00:00",
      "cve": "CVE-2026-68131",
      "id": "CVE-2026-68131",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "45",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rbd: Reset positive result codes to zero in object map update path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68131.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:41:35Z",
      "cve": "CVE-2026-68131",
      "id": "CVE-2026-68131",
      "initial_release_date": "2026-08-18T16:56:27Z",
      "product_status:known_affected": "277",
      "product_status:known_not_affected": "97",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68131",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68131.json",
      "version": "4"
    }
  }
}



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Taxonomy of the tags.





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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.