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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-64091

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

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 16116dac23396e73c01eeee97b102e4833a4b205 to < e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666baffected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < 724a8eb4155669797c96b70d70e354284ae3b5a8affected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < 211ea59988e1cba43cb0367ad65d379b56f9c3bdaffected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < 65a1e67339aa8c95ac544b796946af388930ee23affected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < b4d4efd4e351593c81e9293d4b4408d244fa5ee7affected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < 4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227faffected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < 9a9c859457bc440a55773e01ff18b1bb5bab6836affected
  • 16116dac23396e73c01eeee97b102e4833a4b205 to < 94d27005016be15ffc638b2ecbc4d58805ad7b48affected
  • 3134c5a32810c510f1f447c135cec346acbb71c3affected
  • e861e03a1b5b615ad1b57b1802b17e260eedccfeaffected
  • 0b81edc8818903c64c4d121bc51cd5825be8cc67affected
  • 90ae6475b1753f0c1a4c66034b5666de3189fac8affected
  • 3.16.60 to < 3.17affected
  • 4.4.217 to < 4.5affected
  • 4.9.217 to < 4.10affected
  • 4.14.174 to < 4.15affected

Linux Linux

Default version status: affected

  • 4.17affected
  • 0 to < 4.17unaffected
  • 5.10.259 to ≤ 5.10.*unaffected
  • 5.15.210 to ≤ 5.15.*unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.93 to ≤ 6.12.*unaffected
  • 6.18.34 to ≤ 6.18.*unaffected
  • 7.0.11 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References