CVE-2026-52934 (GCVE-0-2026-52934)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-28 06:36
VLAI
Title
batman-adv: tvlv: reject oversized TVLV packets
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.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < c02aa6c0c9d1bea9bb75dea362b75ad225137bae (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < 1595628a2f877d052eda18865ccf539392c47c04 (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < 6448a49344e87487b61bd88cb850cd694a0f576d (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < 13493b00dd1e05a705981e052158652ea23eb482 (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < 94db72e9dac202e017ee3db22c59d17e4f3bf171 (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < ede47988ac5687793745b17c1634a496a2299919 (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < 94a3d72cd9b21116d7c6d5bdc57c11401fc28557 (git)
Affected: ef26157747d42254453f6b3ac2bd8bd3c53339c3 , < f50487e3566358b2b982b7801945e858c78ad9ab (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52934",
    "datePublished": "2026-06-24T07:14:25.321Z",
    "dateReserved": "2026-06-09T07:44:35.369Z",
    "dateUpdated": "2026-06-28T06:36:55.538Z",
    "state": "PUBLISHED"
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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. 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  }
}


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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.