CVE-2026-64093 (GCVE-0-2026-64093)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
batman-adv: tp_meter: directly shut down timer on cleanup
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: directly shut down timer on cleanup batadv_tp_sender_cleanup() was calling timer_delete_sync() followed by timer_delete() to guard against the timer handler re-arming itself between the two calls. This double-deletion hack relied on the sending status being set to 0 to suppress re-arming. Replace both calls with a single timer_shutdown_sync(). This function both waits for any running timer callback to complete (like timer_delete_sync()) and permanently disarms the timer so it cannot be re-armed afterwards, making re-arming prevention unconditional and self-documenting. The re-arming property is also required because otherwise: 1. context 0 (batadv_tp_recv_ack()) checks in batadv_tp_reset_sender_timer() if sending is still 1 -> it is 2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in this process forces the kthread to stop timer in batadv_tp_sender_cleanup() 3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the timer -> but the reference for it is already gone
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: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 74a76634055462833446684fd526d73c290ea43a (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 5bc2d50fb66b46f86543d5153a188eb1486d0b6e (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < f86b20ec8d17d77bddc02c5c86cfa2389d84ecff (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 770bf0a35f0620b526fd4193889d1e77084e4c43 (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < 933880a8bc9b4042223a79255c0b1021cdc36991 (git)
Affected: 33a3bb4a3345bb511f9c69c913da95d4693e2a4e , < d5487249a81ea658717614009c8f46acc5b7101a (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (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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{
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            "version": "3.1"
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    "dateReserved": "2026-07-19T07:54:57.032Z",
    "dateUpdated": "2026-07-20T13:43:14.395Z",
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This function both\\nwaits for any running timer callback to complete (like timer_delete_sync())\\nand permanently disarms the timer so it cannot be re-armed afterwards,\\nmaking re-arming prevention unconditional and self-documenting.\\n\\nThe re-arming property is also required because otherwise:\\n\\n1. context 0 (batadv_tp_recv_ack()) checks in\\n   batadv_tp_reset_sender_timer() if sending is still 1 -\u003e it is\\n2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in\\n   this process forces the kthread to stop timer in\\n   batadv_tp_sender_cleanup()\\n3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the\\n   timer -\u003e but the reference for it is already gone\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/batman-adv/tp_meter.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"74a76634055462833446684fd526d73c290ea43a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"5bc2d50fb66b46f86543d5153a188eb1486d0b6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"f86b20ec8d17d77bddc02c5c86cfa2389d84ecff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"770bf0a35f0620b526fd4193889d1e77084e4c43\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"933880a8bc9b4042223a79255c0b1021cdc36991\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a3bb4a3345bb511f9c69c913da95d4693e2a4e\",\"lessThan\":\"d5487249a81ea658717614009c8f46acc5b7101a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/batman-adv/tp_meter.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T06:22:55+00:00",
      "cve": "CVE-2026-64093",
      "id": "CVE-2026-64093",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: batman-adv: tp_meter: directly shut down timer on cleanup",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64093.json",
      "version": "3"
    }
  }
}



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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.