CVE-2026-31659

critical · 9.8

In the Linux kernel, the following vulnerability has been resolved: batman-adv: reject oversized global TT response buffers batadv_tt_prepare_tvlv_global_data() builds the allocation length for a global TT response in 16-bit temporaries. When a remote originator advertises a large enough global TT, the TT payload length plus the VLAN header offset can exceed 65535 and wrap before kmalloc(). The full-table response path still uses the original TT payload length when it fills tt_change, so the wrapped allocation is too small and batadv_tt_prepare_tvlv_global_data() writes past the end of the heap object before the later packet-size check runs. Fix this by rejecting TT responses whose TVLV value length cannot fit in the 16-bit TVLV payload length field.

9.8

CVSS

0.4%

EPSS (exploit prob.)

34th

EPSS percentile

2026-04-24

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Vendor	Product	Affected versions
linux	linux_kernel	>= 3.13.1, < 5.10.253
linux	linux_kernel	>= 5.11, < 5.15.203
linux	linux_kernel	>= 5.16, < 6.1.169
linux	linux_kernel	>= 6.2, < 6.6.135
linux	linux_kernel	>= 6.7, < 6.12.82
linux	linux_kernel	>= 6.13, < 6.18.23
linux	linux_kernel	>= 6.19, < 6.19.13
linux	linux_kernel	3.13
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

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References

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-31659