9.8

CVE-2026-64091

batman-adv: tt: fix TOCTOU race for reported vlans

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.16.60 < 3.17
Linux ≫ Linux Kernel Version >= 4.4.217 < 4.5
Linux ≫ Linux Kernel Version >= 4.9.217 < 4.10
Linux ≫ Linux Kernel Version >= 4.14.174 < 4.15
Linux ≫ Linux Kernel Version >= 4.17.1 < 5.10.259
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.210
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.176
Linux ≫ Linux Kernel Version >= 6.2 < 6.6.143
Linux ≫ Linux Kernel Version >= 6.7 < 6.12.93
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.34
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.11
Linux ≫ Linux Kernel Version4.17 Update-
Linux ≫ Linux Kernel Version4.17 Updaterc7
Linux ≫ Linux Kernel Version7.1 Updaterc1
Linux ≫ Linux Kernel Version7.1 Updaterc2
Linux ≫ Linux Kernel Version7.1 Updaterc3
Linux ≫ Linux Kernel Version7.1 Updaterc4
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.43% 0.353
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

https://git.kernel.org/stable/c/e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b
Patch
https://git.kernel.org/stable/c/724a8eb4155669797c96b70d70e354284ae3b5a8
Patch
https://git.kernel.org/stable/c/211ea59988e1cba43cb0367ad65d379b56f9c3bd
Patch
https://git.kernel.org/stable/c/65a1e67339aa8c95ac544b796946af388930ee23
Patch
https://git.kernel.org/stable/c/b4d4efd4e351593c81e9293d4b4408d244fa5ee7
Patch
https://git.kernel.org/stable/c/4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f
Patch
https://git.kernel.org/stable/c/9a9c859457bc440a55773e01ff18b1bb5bab6836
Patch
https://git.kernel.org/stable/c/94d27005016be15ffc638b2ecbc4d58805ad7b48
Patch