CVE-2026-72231: batman-adv: tt: avoid request storms during pending request

CVE-2026-72231: batman-adv: tt: avoid request storms during pending request

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: tt: avoid request storms during pending request

batadv_send_tt_request() allocates a tt_req_node when none exists for the
destination originator node. This should prevent that a multiple TT
requests are send at the same time to an originator.

But if allocation of the send buffer failed, this request must be cleaned
up again. But indicator for such a failure is "ret == false". But the
actual implementation is checking for "ret == true".

The check must be inverted to not loose the information about the TT
request directly after it was attempted to be sent out. This should avoid
potential request storms.

The Linux kernel CVE team has assigned CVE-2026-72231 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 5.10.261 with commit 6055695ea40c64a47e00742c12c99b1a33b4daed
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 5.15.212 with commit 21c44a6895f41df811d1c91d10eea194dda2b345
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 6.1.178 with commit 5e46c76d9a5062212c4c5f642a5549fd9c057f8a
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 6.6.145 with commit 067e413eec2e63c2996909ef55214b3a0eda0be7
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 6.12.97 with commit 716f434eb35869e130424331584a91fbb729b9bd
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 6.18.40 with commit 6a65ac8a81e903bb4b555c1d13532f5cb0167a4a
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 7.1.5 with commit aba1cf21954e64c36afb966b754adad2b0b8aa48
	Issue introduced in 3.13 with commit 335fbe0f5d2501b7dd815806aef6fd9bad784eb1 and fixed in 7.2-rc3 with commit 27c7d40008231ae4140d35501b60087a9de2d2c3

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-72231
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/batman-adv/translation-table.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/6055695ea40c64a47e00742c12c99b1a33b4daed
	https://git.kernel.org/stable/c/21c44a6895f41df811d1c91d10eea194dda2b345
	https://git.kernel.org/stable/c/5e46c76d9a5062212c4c5f642a5549fd9c057f8a
	https://git.kernel.org/stable/c/067e413eec2e63c2996909ef55214b3a0eda0be7
	https://git.kernel.org/stable/c/716f434eb35869e130424331584a91fbb729b9bd
	https://git.kernel.org/stable/c/6a65ac8a81e903bb4b555c1d13532f5cb0167a4a
	https://git.kernel.org/stable/c/aba1cf21954e64c36afb966b754adad2b0b8aa48
	https://git.kernel.org/stable/c/27c7d40008231ae4140d35501b60087a9de2d2c3