cve/published/2025/CVE-2025-22056.mbox

From bippy-1.2.0 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@kernel.org>
To: <linux-cve-announce@vger.kernel.org>
Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org>
Subject: CVE-2025-22056: netfilter: nft_tunnel: fix geneve_opt type confusion addition

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

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

netfilter: nft_tunnel: fix geneve_opt type confusion addition

When handling multiple NFTA_TUNNEL_KEY_OPTS_GENEVE attributes, the
parsing logic should place every geneve_opt structure one by one
compactly. Hence, when deciding the next geneve_opt position, the
pointer addition should be in units of char *.

However, the current implementation erroneously does type conversion
before the addition, which will lead to heap out-of-bounds write.

[    6.989857] ==================================================================
[    6.990293] BUG: KASAN: slab-out-of-bounds in nft_tunnel_obj_init+0x977/0xa70
[    6.990725] Write of size 124 at addr ffff888005f18974 by task poc/178
[    6.991162]
[    6.991259] CPU: 0 PID: 178 Comm: poc-oob-write Not tainted 6.1.132 #1
[    6.991655] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
[    6.992281] Call Trace:
[    6.992423]  <TASK>
[    6.992586]  dump_stack_lvl+0x44/0x5c
[    6.992801]  print_report+0x184/0x4be
[    6.993790]  kasan_report+0xc5/0x100
[    6.994252]  kasan_check_range+0xf3/0x1a0
[    6.994486]  memcpy+0x38/0x60
[    6.994692]  nft_tunnel_obj_init+0x977/0xa70
[    6.995677]  nft_obj_init+0x10c/0x1b0
[    6.995891]  nf_tables_newobj+0x585/0x950
[    6.996922]  nfnetlink_rcv_batch+0xdf9/0x1020
[    6.998997]  nfnetlink_rcv+0x1df/0x220
[    6.999537]  netlink_unicast+0x395/0x530
[    7.000771]  netlink_sendmsg+0x3d0/0x6d0
[    7.001462]  __sock_sendmsg+0x99/0xa0
[    7.001707]  ____sys_sendmsg+0x409/0x450
[    7.002391]  ___sys_sendmsg+0xfd/0x170
[    7.003145]  __sys_sendmsg+0xea/0x170
[    7.004359]  do_syscall_64+0x5e/0x90
[    7.005817]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
[    7.006127] RIP: 0033:0x7ec756d4e407
[    7.006339] Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 faf
[    7.007364] RSP: 002b:00007ffed5d46760 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[    7.007827] RAX: ffffffffffffffda RBX: 00007ec756cc4740 RCX: 00007ec756d4e407
[    7.008223] RDX: 0000000000000000 RSI: 00007ffed5d467f0 RDI: 0000000000000003
[    7.008620] RBP: 00007ffed5d468a0 R08: 0000000000000000 R09: 0000000000000000
[    7.009039] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
[    7.009429] R13: 00007ffed5d478b0 R14: 00007ec756ee5000 R15: 00005cbd4e655cb8

Fix this bug with correct pointer addition and conversion in parse
and dump code.

The Linux kernel CVE team has assigned CVE-2025-22056 to this issue.


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

	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 5.10.236 with commit 31d49eb436f2da61280508d7adf8c9b473b967aa
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 5.15.180 with commit ca2adfc03cd6273f0b589fe65afc6f75e0fe116e
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 6.1.134 with commit a263d31c8c92e5919d41af57d9479cfb66323782
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 6.6.87 with commit 28d88ee1e1cc8ac2d79aeb112717b97c5c833d43
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 6.12.23 with commit 0a93a710d6df334b828ea064c6d39fda34f901dc
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 6.13.11 with commit 446d94898c560ed2f61e26ae445858a4c4830762
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 6.14.2 with commit 708e268acb3a446ad2a8a3d2e9bd41cc23660cd6
	Issue introduced in 5.7 with commit 925d844696d9287f841d6b3e0ed62a35fb175970 and fixed in 6.15 with commit 1b755d8eb1ace3870789d48fbd94f386ad6e30be

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-2025-22056
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/netfilter/nft_tunnel.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/31d49eb436f2da61280508d7adf8c9b473b967aa
	https://git.kernel.org/stable/c/ca2adfc03cd6273f0b589fe65afc6f75e0fe116e
	https://git.kernel.org/stable/c/a263d31c8c92e5919d41af57d9479cfb66323782
	https://git.kernel.org/stable/c/28d88ee1e1cc8ac2d79aeb112717b97c5c833d43
	https://git.kernel.org/stable/c/0a93a710d6df334b828ea064c6d39fda34f901dc
	https://git.kernel.org/stable/c/446d94898c560ed2f61e26ae445858a4c4830762
	https://git.kernel.org/stable/c/708e268acb3a446ad2a8a3d2e9bd41cc23660cd6
	https://git.kernel.org/stable/c/1b755d8eb1ace3870789d48fbd94f386ad6e30be