CVE-2026-43304 (GCVE-0-2026-43304)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-10-19 19:16
VLAI
Title
libceph: define and enforce CEPH_MAX_KEY_LEN
Summary
In the Linux kernel, the following vulnerability has been resolved: libceph: define and enforce CEPH_MAX_KEY_LEN When decoding the key, verify that the key material would fit into a fixed-size buffer in process_auth_done() and generally has a sane length. The new CEPH_MAX_KEY_LEN check replaces the existing check for a key with no key material which is a) not universal since CEPH_CRYPTO_NONE has to be excluded and b) doesn't provide much value since a smaller than needed key is just as invalid as no key -- this has to be handled elsewhere anyway.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:16 UTC
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 6405e8c680974bb74e2c98d5249fb52c7b12a6c6 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 8d745d38c88ecbed95f6b2b39857bf89f35a3244 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < e1dc45d97975f9db65694d234fbddf1915176e16 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < 1b275bd49e58752efb83767a5d1aed41356c5e64 (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < c1a0f5f1e5e7e98c36a362ec3d1fcfd9932931ed (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < d82467c07b03a27c3c5469b62bb3b726305a80bb (git)
Affected: cd1a677cad994021b19665ed476aea63f5d54f31 , < ac431d597a9bdfc2ba6b314813f29a6ef2b4a3bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/e1dc45d97975f9db65694d234fbddf1915176e16"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
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                "value": "NVD-CWE-noinfo"
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            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
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              {
                "lang": "en",
                "value": "CWE-121"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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    },
    "redhat_vex": {
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      "current_release_date": "2026-07-14T11:37:43+00:00",
      "cve": "CVE-2026-43304",
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      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libceph: define and enforce CEPH_MAX_KEY_LEN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43304.json",
      "version": "3"
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    "vulnrichment": {
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            "metrics": [
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                "other": {
                  "content": {
                    "id": "CVE-2026-43304",
                    "options": [
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                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
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                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:16:20.550708Z",
                    "version": "2.0.3"
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              }
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                ]
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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              "programFiles": [
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              "vendor": "Linux",
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                  "version": "5.11"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
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                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
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            }
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                  "value": "AV:N - The vulnerable path is reached by TCP data received from a Ceph msgr2 peer during monitor/OSD authentication, through sock_recvmsg() to process_auth_done(). A malicious or compromised Ceph endpoint can supply the crafted AUTH_DONE payload over the network.\nAC:L - Once the attacker can act as the responding Ceph peer, the oversized decoded session key is a deterministic protocol field and no race or hard-to-control condition is required. The stack overwrite follows directly from the key length accepted before the fix.\nPR:N - The attacker needs no local privileges on the victim kernel; the code is reached during the network authentication handshake before the connection is fully established. Even though CephX payloads are cryptographic, a malicious configured/compromised peer can trigger the path remotely.\nUI:N - No interactive victim action is required once the vulnerable client connects to the Ceph peer as part of normal operation. The malicious AUTH_DONE response is processed automatically by the kernel client.\nS:U - The impact is compromise or crash of the same kernel/client security authority that contains the vulnerable libceph code. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug is attacker-controlled kernel stack memory corruption from copying an unchecked session key into a fixed-size stack buffer. Such memory corruption can reasonably be leveraged for sensitive kernel memory disclosure.\nI:H - The unchecked memcpy can overwrite adjacent kernel stack state with attacker-controlled key bytes. This is an out-of-bounds write with plausible control-flow or data corruption impact.\nA:H - The stack overflow can corrupt kernel execution state and cause an oops or panic. Even without full exploitation, a malicious peer can crash the client kernel."
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        "cveId": "CVE-2026-43304",
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        "dateReserved": "2026-05-01T14:12:56.000Z",
        "dateUpdated": "2026-10-19T19:16:26.177Z",
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}



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