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🛡️ CVE-2025-68800 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats

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

mlxsw: spectrum_mr: Fix use-after-free when updating multicast route stats

Cited commit added a dedicated mutex (instead of RTNL) to protect the

multicast route list, so that it will not change while the driver

periodically traverses it in order to update the kernel about multicast

route stats that were queried from the device.

One instance of list entry deletion (during route replace) was missed

and it can result in a use-after-free [1].

Fix by acquiring the mutex before deleting the entry from the list and

releasing it afterwards.

[1]

BUG: KASAN: slab-use-after-free in mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]

Read of size 8 at addr ffff8881523c2fa8 by task kworker/2:5/22043

CPU: 2 UID: 0 PID: 22043 Comm: kworker/2:5 Not tainted 6.18.0-rc1-custom-g1a3d6d7cd014 #1 PREEMPT(full)

Hardware name: Mellanox Technologies Ltd. MSN2010/SA002610, BIOS 5.6.5 08/24/2017

Workqueue: mlxsw_core mlxsw_sp_mr_stats_update [mlxsw_spectrum]

Call Trace:

<TASK>

dump_stack_lvl+0xba/0x110

print_report+0x174/0x4f5

kasan_report+0xdf/0x110

mlxsw_sp_mr_stats_update+0x4a5/0x540 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:1006 [mlxsw_spectrum]

process_one_work+0x9cc/0x18e0

worker_thread+0x5df/0xe40

kthread+0x3b8/0x730

ret_from_fork+0x3e9/0x560

ret_from_fork_asm+0x1a/0x30

</TASK>

Allocated by task 29933:

kasan_save_stack+0x30/0x50

kasan_save_track+0x14/0x30

__kasan_kmalloc+0x8f/0xa0

mlxsw_sp_mr_route_add+0xd8/0x4770 [mlxsw_spectrum]

mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]

process_one_work+0x9cc/0x18e0

worker_thread+0x5df/0xe40

kthread+0x3b8/0x730

ret_from_fork+0x3e9/0x560

ret_from_fork_asm+0x1a/0x30

Freed by task 29933:

kasan_save_stack+0x30/0x50

kasan_save_track+0x14/0x30

__kasan_save_free_info+0x3b/0x70

__kasan_slab_free+0x43/0x70

kfree+0x14e/0x700

mlxsw_sp_mr_route_add+0x2dea/0x4770 drivers/net/ethernet/mellanox/mlxsw/spectrum_mr.c:444 [mlxsw_spectrum]

mlxsw_sp_router_fibmr_event_work+0x371/0xad0 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:7965 [mlxsw_spectrum]

process_one_work+0x9cc/0x18e0

worker_thread+0x5df/0xe40

kthread+0x3b8/0x730

ret_from_fork+0x3e9/0x560

ret_from_fork_asm+0x1a/0x30

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2025-68800 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.18.3)
  • unknown

Timeline and source

Published on 13 January 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-68800 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-01-13
Updated 2026-08-20
Modified 2026-08-12
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.18.3
unknown — —

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