netfilter: nf_tables: always release netdev hooks from notifier

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Summary

CVECVE-2023-54200
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-30 13:16:08 UTC
Updated2026-10-15 22:17:54 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001300000 probability, percentile 0.030010000 (date 2026-08-06)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 68a3765c659f809dcaac20030853a054646eb739 8d56f00c61f67b450fbbdcb874855e60ad92c560 git Not specified
CNA Linux Linux affected 68a3765c659f809dcaac20030853a054646eb739 30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880 git Not specified
CNA Linux Linux affected 68a3765c659f809dcaac20030853a054646eb739 94032527efbac13be702c76afb9d872c0cca7a43 git Not specified
CNA Linux Linux affected 68a3765c659f809dcaac20030853a054646eb739 dc1c9fd4a8bbe1e06add9053010b652449bfe411 git Not specified
CNA Linux Linux affected 90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9f git Not specified
CNA Linux Linux affected 5.14.15 5.15 semver Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.113 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.30 6.1.* semver Not specified
CNA Linux Linux unaffected 6.3.4 6.3.* semver Not specified
CNA Linux Linux unaffected 6.4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/94032527efbac13be702c76afb9d872c0cca7a43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d56f00c61f67b450fbbdcb874855e60ad92c560 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc1c9fd4a8bbe1e06add9053010b652449bfe411 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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