Riskcovery

CVE-2023-54200

netfilter: nf_tables: always release netdev hooks from notifier

State
Published
Severity
7.8 High
Published
Dec 30, 2025
Updated
Oct 15, 2026
Reserved
Dec 30, 2025

Read the record on cve.org

Description

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

netfilter: nf_tables: always release netdev hooks from notifier

This reverts "netfilter: nf_tables: skip netdev events generated on netns removal".

The problem is that when a veth device is released, the veth release callback will also queue the peer netns device for removal.

Its possible that the peer netns is also slated for removal. In this case, the device memory is already released before the pre_exit hook of the peer netns runs:

BUG: KASAN: slab-use-after-free in nf_hook_entry_head+0x1b8/0x1d0 Read of size 8 at addr ffff88812c0124f0 by task kworker/u8:1/45 Workqueue: netns cleanup_net Call Trace: nf_hook_entry_head+0x1b8/0x1d0 __nf_unregister_net_hook+0x76/0x510 nft_netdev_unregister_hooks+0xa0/0x220 __nft_release_hook+0x184/0x490 nf_tables_pre_exit_net+0x12f/0x1b0 ..

Order is: 1. First netns is released, veth_dellink() queues peer netns device for removal 2. peer netns is queued for removal 3. peer netns device is released, unreg event is triggered 4. unreg event is ignored because netns is going down 5. pre_exit hook calls nft_netdev_unregister_hooks but device memory might be free'd already.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 68a3765c659f809dcaac20030853a054646eb739 to before 8d56f00c61f67b450fbbdcb874855e60ad92c560Affected
  • 68a3765c659f809dcaac20030853a054646eb739 to before 30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880Affected
  • 68a3765c659f809dcaac20030853a054646eb739 to before 94032527efbac13be702c76afb9d872c0cca7a43Affected
  • 68a3765c659f809dcaac20030853a054646eb739 to before dc1c9fd4a8bbe1e06add9053010b652449bfe411Affected
  • 90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9fAffected
  • 5.14.15 to before 5.15Affected
LinuxLinux
  • 5.15Affected
  • before 5.15Not affected
  • 5.15.113 through 5.15.*Not affected
  • 6.1.30 through 6.1.*Not affected
  • 6.3.4 through 6.3.*Not affected
  • 6.4 and laterNot affected

References

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