CVE-2026-52934 (GCVE-0-2026-52934)
Vulnerability from cvelistv5
Published
2026-06-24 07:14
Modified
2026-08-05 12:31
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tvlv: reject oversized TVLV packets batadv_tvlv_container_ogm_append() builds a TVLV packet section from the tvlv.container_list. The total size of this section is computed by batadv_tvlv_container_list_size(), which sums the sizes of all registered containers. The return type and accumulator in batadv_tvlv_container_list_size() were u16. If the accumulated size exceeds U16_MAX, the value wraps around, causing the subsequent allocation in batadv_tvlv_container_ogm_append() to be undersized. The memcpy-style copy that follows would then write beyond the end of the allocated buffer, corrupting kernel memory. Fix this by widening the return type of batadv_tvlv_container_list_size() to size_t. In batadv_tvlv_container_ogm_append(), check the computed length against U16_MAX before proceeding, and bail out as if the allocation had failed when the limit is exceeded.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
Version: ef26157747d42254453f6b3ac2bd8bd3c53339c3
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/tvlv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c02aa6c0c9d1bea9bb75dea362b75ad225137bae",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "1595628a2f877d052eda18865ccf539392c47c04",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "6448a49344e87487b61bd88cb850cd694a0f576d",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "13493b00dd1e05a705981e052158652ea23eb482",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "94db72e9dac202e017ee3db22c59d17e4f3bf171",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "ede47988ac5687793745b17c1634a496a2299919",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "94a3d72cd9b21116d7c6d5bdc57c11401fc28557",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            },
            {
              "lessThan": "f50487e3566358b2b982b7801945e858c78ad9ab",
              "status": "affected",
              "version": "ef26157747d42254453f6b3ac2bd8bd3c53339c3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/batman-adv/tvlv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.259",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.143",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.93",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "3.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tvlv: reject oversized TVLV packets\n\nbatadv_tvlv_container_ogm_append() builds a TVLV packet section from\nthe tvlv.container_list. The total size of this section is computed by\nbatadv_tvlv_container_list_size(), which sums the sizes of all registered\ncontainers.\n\nThe return type and accumulator in batadv_tvlv_container_list_size() were\nu16. If the accumulated size exceeds U16_MAX, the value wraps around,\ncausing the subsequent allocation in batadv_tvlv_container_ogm_append()\nto be undersized. The memcpy-style copy that follows would then write\nbeyond the end of the allocated buffer, corrupting kernel memory.\n\nFix this by widening the return type of batadv_tvlv_container_list_size()\nto size_t. In batadv_tvlv_container_ogm_append(), check the computed length\nagainst U16_MAX before proceeding, and bail out as if the allocation had\nfailed when the limit is exceeded."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - batman-adv is a layer-2 mesh/bridge subsystem, and the defensible remote path is from an attached same-link client or mesh segment causing local TT TVLV growth before periodic OGM generation. This is adjacent-network reachability rather than a routable Internet service.\nAC:L - Once on the L2 segment in a vulnerable high-MTU/fragmentation deployment, the attacker can repeatedly emit frames with many source MACs and wait for the periodic OGM append path. No race or probabilistic condition is required.\nPR:N - The attacker does not need a local account or kernel privileges on the vulnerable system in the adjacent-client scenario. Administrative netlink privileges are needed to deploy/configure batman-adv, but not to trigger TT learning on an already deployed node.\nUI:N - No victim user action is required after the vulnerable batman-adv node is configured and active. OGM generation is periodic kernel work.\nS:U - The corruption occurs in the vulnerable host kernel and affects resources under the same kernel security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary.\nC:H - The bug is a kernel heap out-of-bounds write from an undersized kmalloc buffer, with attacker-influenced TVLV/TT data. Such memory corruption is reasonably exploitable for information disclosure, so confidentiality is High.\nI:H - The memcpy-style overflow corrupts adjacent kernel heap memory and can plausibly be shaped into arbitrary write or code execution. Out-of-bounds kernel writes are scored as High integrity impact.\nA:H - Even without full exploitation, the heap overflow can corrupt kernel memory and crash or panic the system. Availability impact is therefore High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:52.290Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c02aa6c0c9d1bea9bb75dea362b75ad225137bae"
        },
        {
          "url": "https://git.kernel.org/stable/c/1595628a2f877d052eda18865ccf539392c47c04"
        },
        {
          "url": "https://git.kernel.org/stable/c/6448a49344e87487b61bd88cb850cd694a0f576d"
        },
        {
          "url": "https://git.kernel.org/stable/c/13493b00dd1e05a705981e052158652ea23eb482"
        },
        {
          "url": "https://git.kernel.org/stable/c/94db72e9dac202e017ee3db22c59d17e4f3bf171"
        },
        {
          "url": "https://git.kernel.org/stable/c/ede47988ac5687793745b17c1634a496a2299919"
        },
        {
          "url": "https://git.kernel.org/stable/c/94a3d72cd9b21116d7c6d5bdc57c11401fc28557"
        },
        {
          "url": "https://git.kernel.org/stable/c/f50487e3566358b2b982b7801945e858c78ad9ab"
        }
      ],
      "title": "batman-adv: tvlv: reject oversized TVLV packets",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52934",
    "datePublished": "2026-06-24T07:14:25.321Z",
    "dateReserved": "2026-06-09T07:44:35.369Z",
    "dateUpdated": "2026-08-05T12:31:52.290Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.