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CVE-2026-52919 (GCVE-0-2026-52919)

Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-08-05 12:31
VLAI
Title
batman-adv: fix tp_meter counter underflow during shutdown
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: fix tp_meter counter underflow during shutdown batadv_tp_sender_shutdown() unconditionally decrements the "sending" atomic counter. If multiple paths (e.g. timeout, user cancel, and normal finish) call this function, the counter can underflow to -1. Since the sender logic treats any non-zero value as "still sending", a negative value causes the sender kthread to loop indefinitely. This leads to a use-after-free when the interface is removed while the zombie thread is still active. Fix this by using atomic_xchg() to ensure the counter only transitions from 1 to 0 once. [sven: added missing change in batadv_tp_send]
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < e75e2ab463b5b34df6b98f94d740aff327ce9f6b (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < abae88fa254f2981d39ac003a7b302528a22af64 (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < c66d20a3ff095e3f000551d208ec2606616db15c (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < c1bac194733aabd731aafa6a01350c229e187dba (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 01cefc5923889e29dbb5f281c3d457714ceb9c00 (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 90ae3eae06b7b8ab9f6250b9497c860915b4c17b (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < aeae11c5dad9cd0d50723890bdd866f8e6db2e7d (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 94f3b133168d1c49895e7cc6afbcf1cc0b354602 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 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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If multiple paths (e.g. timeout, user cancel, and\\nnormal finish) call this function, the counter can underflow to -1.\\n\\nSince the sender logic treats any non-zero value as \\\"still sending\\\",\\na negative value causes the sender kthread to loop indefinitely.\\nThis leads to a use-after-free when the interface is removed while\\nthe zombie thread is still active.\\n\\nFix this by using atomic_xchg() to ensure the counter only transitions\\nfrom 1 to 0 once.\\n\\n[sven: added missing change in 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    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:43:40+00:00",
      "cve": "CVE-2026-52919",
      "id": "CVE-2026-52919",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: fix tp_meter counter underflow during shutdown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52919.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T16:48:06Z",
      "cve": "CVE-2026-52919",
      "id": "CVE-2026-52919",
      "initial_release_date": "2026-06-25T02:20:07Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "505",
      "product_status:known_not_affected": "81",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52919",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52919.json",
      "version": "10"
    }
  }
}



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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.