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CVE-2026-93204 (GCVE-0-2026-93204)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-09-17 16:12
VLAI
Title
batman-adv: dat: atomically update mac addresses
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: dat: atomically update mac addresses When a MAC address is updated in batadv_dat_entry_add(), it is done using a simple copy function. A parallel reader might only see parts of this update. In worst case, the reader is transporting the half updated MAC address over the network or is creating an ARP response using it - poisoning the ARP cache. atomic64_t can be used to store the 48 bit of a mac address. A reader will then either see the old mac address or the new one - never a mixture of both.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < 159360a0de831845c4500b4f8638decdcd624040 (git)
Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < 259db2c04586d40b82c5c3002b1e28b0698a0bb7 (git)
Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < 1674855a5b6eacfe35f4db3095d7055c25467274 (git)
Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < 66238e2a74eca5dabf85b0cd2c3c944e474dc2fd (git)
Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < a5e4d6cb4f6848b8906c1c493f99a8ccc0638515 (git)
Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < f68038c77a2f38c09c7e2e4f7fa1f4e246fdf2c9 (git)
Affected: 2f1dfbe185075a50dc8f0490a136377af53a1c62 , < e6de568d3eda3e3c01c868fabd7a9535d5ee4a73 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
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          "product": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: dat: atomically update mac addresses\n\nWhen a MAC address is updated in batadv_dat_entry_add(), it is done using a\nsimple copy function. A parallel reader might only see parts of this\nupdate. In worst case, the reader is transporting the half updated MAC\naddress over the network or is creating an ARP response using it -\npoisoning the ARP cache.\n\natomic64_t can be used to store the 48 bit of a mac address. A reader will\nthen either see the old mac address or the new one - never a mixture of\nboth."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:12:24.403Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "datePublished": "2026-09-17T16:12:24.403Z",
    "dateReserved": "2026-09-17T16:02:15.093Z",
    "dateUpdated": "2026-09-17T16:12:24.403Z",
    "state": "PUBLISHED"
  },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-18T00:10:45Z",
      "cve": "CVE-2026-93204",
      "id": "CVE-2026-93204",
      "initial_release_date": "2026-09-18T00:10:45Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93204",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93204.json",
      "version": "2"
    }
  }
}



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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.


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.