CVE-2026-80877: afs: Fix vllist leak

CVE-2026-80877: afs: Fix vllist leak

[Greg Kroah-Hartman]

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

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

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

afs: Fix vllist leak

Fix a leak of the new vllist in afs_update_cell() in the event that it is an
empty list (nr_servers == 0), in which case the old list isn't displaced
unless the old list is also empty.

The Linux kernel CVE team has assigned CVE-2026-80877 to this issue.


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

	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 5.10.261 with commit 13403945c2385653e282dacda304dce2a25fdb53
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 5.15.212 with commit 2b169eedbb96f37f3f33d7b496d8283194988980
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 6.1.178 with commit bf55969d9188380eb539bd216850bac27bc2e272
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 6.6.145 with commit bef5514f6b6cb4bed9061f4b628d6be1cf26a39e
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 6.12.97 with commit fbfe75c81bff2359a03e85cf84293484cf60fcb9
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 6.18.40 with commit 8afb1a787a2802caf1895dd96745cfd6790a6f95
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 7.1.5 with commit 91d8f8e5fd34d3aed26f0fe6cf52b3f71de66cc6
	Issue introduced in 5.2 with commit d5c32c89b208e39a39cd8639aa21c012ce0daf4d and fixed in 7.2 with commit fc10c0ecf06f2981af5d04357612b00051e03e9e

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-2026-80877
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:
	fs/afs/cell.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/13403945c2385653e282dacda304dce2a25fdb53
	https://git.kernel.org/stable/c/2b169eedbb96f37f3f33d7b496d8283194988980
	https://git.kernel.org/stable/c/bf55969d9188380eb539bd216850bac27bc2e272
	https://git.kernel.org/stable/c/bef5514f6b6cb4bed9061f4b628d6be1cf26a39e
	https://git.kernel.org/stable/c/fbfe75c81bff2359a03e85cf84293484cf60fcb9
	https://git.kernel.org/stable/c/8afb1a787a2802caf1895dd96745cfd6790a6f95
	https://git.kernel.org/stable/c/91d8f8e5fd34d3aed26f0fe6cf52b3f71de66cc6
	https://git.kernel.org/stable/c/fc10c0ecf06f2981af5d04357612b00051e03e9e