CVE-2026-64091batman-adv: tt: fix TOCTOU race for reported vlans
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 16116dac23396e73c01eeee97b102e4833a4b205 before e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b; 16116dac23396e73c01eeee97b102e4833a4b205 builds before 724a8eb4155669797c96b70d70e354284ae3b5a8; 16116dac23396e73c01eeee97b102e4833a4b205 builds before 211ea59988e1cba43cb0367ad65d379b56f9c3bd; 16116dac23396e73c01eeee97b102e4833a4b205 builds before 65a1e67339aa8c95ac544b796946af388930ee23; from 16116dac23396e73c01eeee97b102e4833a4b205 before b4d4efd4e351593c81e9293d4b4408d244fa5ee7; 16116dac23396e73c01eeee97b102e4833a4b205 builds before 4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f; 16116dac23396e73c01eeee97b102e4833a4b205 builds before 9a9c859457bc440a55773e01ff18b1bb5bab6836; 16116dac23396e73c01eeee97b102e4833a4b205 builds before 94d27005016be15ffc638b2ecbc4d58805ad7b48; and 8 more ranges | CNA record |
linux linux_kernel linux:linux_kernel | from 3.16.60 before 3.17; from 4.4.217 before 4.5; from 4.9.217 before 4.10; from 4.14.174 before 4.15; from 4.17.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; and 9 more ranges | NVD |
References
- https://git.kernel.org/stable/c/e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666bpatch
- https://git.kernel.org/stable/c/724a8eb4155669797c96b70d70e354284ae3b5a8patch
- https://git.kernel.org/stable/c/211ea59988e1cba43cb0367ad65d379b56f9c3bdpatch
- https://git.kernel.org/stable/c/65a1e67339aa8c95ac544b796946af388930ee23patch
- https://git.kernel.org/stable/c/b4d4efd4e351593c81e9293d4b4408d244fa5ee7patch
- https://git.kernel.org/stable/c/4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227fpatch
- https://git.kernel.org/stable/c/9a9c859457bc440a55773e01ff18b1bb5bab6836patch
- https://git.kernel.org/stable/c/94d27005016be15ffc638b2ecbc4d58805ad7b48patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.