netfilter: nf_tables: always release netdev hooks from notifier
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.15, 5.15.113, 6.1.30, 6.3.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From 68a3765c659f809dcaac20030853a054646eb739 · fixed in 8d56f00c61f67b450fbbdcb874855e60ad92c560; From 68a3765c659f809dcaac20030853a054646eb739 · fixed in 30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880; From 68a3765c659f809dcaac20030853a054646eb739 · fixed in 94032527efbac13be702c76afb9d872c0cca7a43; From 68a3765c659f809dcaac20030853a054646eb739 · fixed in dc1c9fd4a8bbe1e06add9053010b652449bfe411; From 5.14.15 · fixed in 5.15
- Linux Linux
5.15
- KernelLinux
From 5.15.0 · fixed in 5.15.113; From 5.16.0 · fixed in 6.1.30; From 6.2.0 · fixed in 6.3.4