CVE-2026-64091batman-adv: tt: fix TOCTOU race for reported vlans
- 9.8CriticalCVSS base score
- 0.43%Exploitation in 30 daysEPSS · top 63% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 17 days later
· 17 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.43% · top 63% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < 724a8eb4155669797c96b70d70e354284ae3b5a8
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < 211ea59988e1cba43cb0367ad65d379b56f9c3bd
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < 65a1e67339aa8c95ac544b796946af388930ee23
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < b4d4efd4e351593c81e9293d4b4408d244fa5ee7
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < 4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < 9a9c859457bc440a55773e01ff18b1bb5bab6836
- affected 16116dac23396e73c01eeee97b102e4833a4b205 – < 94d27005016be15ffc638b2ecbc4d58805ad7b48
- affected 3134c5a32810c510f1f447c135cec346acbb71c3
- affected e861e03a1b5b615ad1b57b1802b17e260eedccfe
- affected 0b81edc8818903c64c4d121bc51cd5825be8cc67
- affected 90ae6475b1753f0c1a4c66034b5666de3189fac8
- affected 3.16.60 – < 3.17
- affected 4.4.217 – < 4.5
- affected 4.9.217 – < 4.10
- affected 4.14.174 – < 4.15
- affected 4.17
- unaffected < 4.17
- unaffected 5.10.259 – ≤ 5.10.*
- unaffected 5.15.210 – ≤ 5.15.*
- unaffected 6.1.176 – ≤ 6.1.*
- unaffected 6.6.143 – ≤ 6.6.*
- unaffected 6.12.93 – ≤ 6.12.*
- unaffected 6.18.34 – ≤ 6.18.*
- unaffected 7.0.11 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b (opens in a new tab)
- https://git.kernel.org/stable/c/724a8eb4155669797c96b70d70e354284ae3b5a8 (opens in a new tab)
- https://git.kernel.org/stable/c/211ea59988e1cba43cb0367ad65d379b56f9c3bd (opens in a new tab)
- https://git.kernel.org/stable/c/65a1e67339aa8c95ac544b796946af388930ee23 (opens in a new tab)
- https://git.kernel.org/stable/c/b4d4efd4e351593c81e9293d4b4408d244fa5ee7 (opens in a new tab)
- https://git.kernel.org/stable/c/4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f (opens in a new tab)
- https://git.kernel.org/stable/c/9a9c859457bc440a55773e01ff18b1bb5bab6836 (opens in a new tab)
- https://git.kernel.org/stable/c/94d27005016be15ffc638b2ecbc4d58805ad7b48 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45776 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64091)Record last updated .