netfilter: nf_tables: always release netdev hooks from notifier
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.
CVE-2023-54200
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2023-54200
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "8d56f00c61f67b450fbbdcb874855e60ad92c560",
"versionType": "git"
},
{
"status": "affected",
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880",
"versionType": "git"
},
{
"status": "affected",
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "94032527efbac13be702c76afb9d872c0cca7a43",
"versionType": "git"
},
{
"status": "affected",
"version": "68a3765c659f809dcaac20030853a054646eb739",
"lessThan": "dc1c9fd4a8bbe1e06add9053010b652449bfe411",
"versionType": "git"
},
{
"status": "affected",
"version": "90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9f",
"versionType": "git"
},
{
"status": "affected",
"version": "5.14.15",
"lessThan": "5.15",
"versionType": "semver"
}
],
"programFiles": [
"net/netfilter/nft_chain_filter.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.113",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.30",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.3.4",
"versionType": "semver",
"lessThanOrEqual": "6.3.*"
},
{
"status": "unaffected",
"version": "6.4",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nft_chain_filter.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2023-54200
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30359 · Revision 1
- Added to Heist Feed
- Publisher date