CVE-2026-64091 (GCVE-0-2026-64091)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43
VLAI
Title
batman-adv: tt: fix TOCTOU race for reported vlans
Summary
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix TOCTOU race for reported vlans The local TT based TVLV is generated by first checking the number of VLANs which have at least one TT entry. A new buffer with the correct size for the VLANs is then allocated. Only then, the list of VLANs s used to fill the VLAN entries in the buffer. During this time, the meshif_vlan_list_lock is held. But the actual number of TT entries of each VLAN can still increase during this time - just not the number of VLANs in the list. But the prefilter used in the buffer size calculation might still cause an increase of the number of VLANs which need to be stored. Simply because a VLAN might now suddenly have at least one entry when it had none in the pre-alloc check - and then needs to occupy space which was not allocated. It is better to overestimate the buffer size at the beginning and then fill the buffer only with the VLANs which are not empty.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < 724a8eb4155669797c96b70d70e354284ae3b5a8 (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < 211ea59988e1cba43cb0367ad65d379b56f9c3bd (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < 65a1e67339aa8c95ac544b796946af388930ee23 (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < b4d4efd4e351593c81e9293d4b4408d244fa5ee7 (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < 4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < 9a9c859457bc440a55773e01ff18b1bb5bab6836 (git)
Affected: 16116dac23396e73c01eeee97b102e4833a4b205 , < 94d27005016be15ffc638b2ecbc4d58805ad7b48 (git)
Affected: 3134c5a32810c510f1f447c135cec346acbb71c3 (git)
Affected: e861e03a1b5b615ad1b57b1802b17e260eedccfe (git)
Affected: 0b81edc8818903c64c4d121bc51cd5825be8cc67 (git)
Affected: 90ae6475b1753f0c1a4c66034b5666de3189fac8 (git)
Affected: 3.16.60 , < 3.17 (semver)
Affected: 4.4.217 , < 4.5 (semver)
Affected: 4.9.217 , < 4.10 (semver)
Affected: 4.14.174 , < 4.15 (semver)
Create a notification for this product.
Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (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)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
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      "cve": "CVE-2026-64091",
      "id": "CVE-2026-64091",
      "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: tt: fix TOCTOU race for reported vlans",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64091.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.