219 lines
13 KiB
JSON
219 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-56655",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-27T15:00:39.841Z",
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"datePublished": "2024-12-27T15:06:19.033Z",
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"dateUpdated": "2026-08-05T11:45:53.066Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:45:53.066Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: do not defer rule destruction via call_rcu\n\nnf_tables_chain_destroy can sleep, it can't be used from call_rcu\ncallbacks.\n\nMoreover, nf_tables_rule_release() is only safe for error unwinding,\nwhile transaction mutex is held and the to-be-desroyed rule was not\nexposed to either dataplane or dumps, as it deactives+frees without\nthe required synchronize_rcu() in-between.\n\nnft_rule_expr_deactivate() callbacks will change ->use counters\nof other chains/sets, see e.g. nft_lookup .deactivate callback, these\nmust be serialized via transaction mutex.\n\nAlso add a few lockdep asserts to make this more explicit.\n\nCalling synchronize_rcu() isn't ideal, but fixing this without is hard\nand way more intrusive. As-is, we can get:\n\nWARNING: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x..\nWorkqueue: events nf_tables_trans_destroy_work\nRIP: 0010:nft_set_destroy+0x3fe/0x5c0\nCall Trace:\n <TASK>\n nf_tables_trans_destroy_work+0x6b7/0xad0\n process_one_work+0x64a/0xce0\n worker_thread+0x613/0x10d0\n\nIn case the synchronize_rcu becomes an issue, we can explore alternatives.\n\nOne way would be to allocate nft_trans_rule objects + one nft_trans_chain\nobject, deactivate the rules + the chain and then defer the freeing to the\nnft destroy workqueue. We'd still need to keep the synchronize_rcu path as\na fallback to handle -ENOMEM corner cases though."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerable path is driven entirely from local interfaces — nfnetlink/NETLINK_NETFILTER to build a netdev-family basechain with rules, and RTNETLINK to unregister the device that fires the NETDEV_UNREGISTER notifier. No remote peer can drive basechain release.\nAC:L - The attacker owns both sides: it creates the netns, the device, and the ruleset, chooses when to delete the device, and issues concurrent nftables transactions that race the unserialized softirq callback, repeating indefinitely; the sleeping-in-atomic path (`cancel_delayed_work_sync`/`mutex_lock` from an RCU softirq callback) is deterministic and needs no race at all.\nPR:L - nfnetlink only requires `netlink_net_capable(skb, CAP_NET_ADMIN)`, evaluated against the network namespace's user_ns, so an unprivileged local user obtains everything needed via `unshare -Urn` — including creating and deleting the dummy/veth device that triggers the notifier.\nUI:N - The attacker performs every step itself — ruleset setup, device removal, and the concurrent transactions; no victim action or pre-existing administrator configuration is needed.\nS:U - Corruption is confined to nf_tables kernel objects within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Unserialized `nft_use_dec()` on `set->use`/`chain->use`/`obj->use` races the commit-mutex-protected control plane, so counters underflow and still-referenced sets/chains are freed, yielding a use-after-free whose reclaimed contents the attacker can shape and read back via ruleset dumps.\nI:H - The softirq callback performs `list_del_rcu()` on `table->sets`/`table->chains` and `rhltable_remove()` on `chains_ht` concurrently with control-plane insertions/removals, giving list and rhashtable corruption on top of the UAF — both standard springboards to controlled kernel writes and control-flow hijack.\nA:H - Sleeping functions (`cancel_delayed_work_sync`, `mutex_lock` via `nf_ct_netns_put`, `nf_tables_chain_destroy`) invoked from an RCU softirq callback produce \"sleeping function called from invalid context\" BUGs and scheduler corruption, and the refcount/list corruption reliably ends in WARNs, oopses, and panics."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/net/netfilter/nf_tables.h",
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"net/netfilter/nf_tables_api.c"
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],
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"versions": [
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"lessThan": "5146c27b2780aac59876a887a5f4e793b8949862",
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"status": "affected",
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"versionType": "git"
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"version": "558f503f707f481bbf40efa74a938b8021df841d",
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"lessThan": "2991dc357a28b61c13ed1f7b59e9251e2b4562fb",
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"status": "affected",
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"status": "affected",
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"version": "bfd05c68e4c6320304e9f371ffa356b6e4b9cc53",
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"lessThan": "27f0574253f6c24c8ee4e3f0a685b75ed3a256ed",
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"status": "affected",
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},
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{
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"version": "c03d278fdf35e73dd0ec543b9b556876b9d9a8dc",
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"lessThan": "7cf0bd232b565d9852cb25fd094f77254773e048",
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"status": "affected",
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"version": "c03d278fdf35e73dd0ec543b9b556876b9d9a8dc",
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"lessThan": "b04df3da1b5c6f6dc7cdccc37941740c078c4043",
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"status": "affected",
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{
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"version": "cb401e5799e0acacb405f2128097e9c4ccf82f8a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.6.61",
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"lessThan": "6.6.67",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.11.8",
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"lessThan": "6.12",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/net/netfilter/nf_tables.h",
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"net/netfilter/nf_tables_api.c"
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],
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},
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{
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"version": "6.12.6",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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},
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"references": [
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"url": "https://git.kernel.org/stable/c/5146c27b2780aac59876a887a5f4e793b8949862"
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}
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],
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"title": "netfilter: nf_tables: do not defer rule destruction via call_rcu",
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