CVE-2024-56655 (GCVE-0-2024-56655)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:06 – Updated: 2025-06-04 12:57
VLAI?
Title
netfilter: nf_tables: do not defer rule destruction via call_rcu
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: do not defer rule destruction via call_rcu nf_tables_chain_destroy can sleep, it can't be used from call_rcu callbacks. Moreover, nf_tables_rule_release() is only safe for error unwinding, while transaction mutex is held and the to-be-desroyed rule was not exposed to either dataplane or dumps, as it deactives+frees without the required synchronize_rcu() in-between. nft_rule_expr_deactivate() callbacks will change ->use counters of other chains/sets, see e.g. nft_lookup .deactivate callback, these must be serialized via transaction mutex. Also add a few lockdep asserts to make this more explicit. Calling synchronize_rcu() isn't ideal, but fixing this without is hard and way more intrusive. As-is, we can get: WARNING: .. net/netfilter/nf_tables_api.c:5515 nft_set_destroy+0x.. Workqueue: events nf_tables_trans_destroy_work RIP: 0010:nft_set_destroy+0x3fe/0x5c0 Call Trace: <TASK> nf_tables_trans_destroy_work+0x6b7/0xad0 process_one_work+0x64a/0xce0 worker_thread+0x613/0x10d0 In case the synchronize_rcu becomes an issue, we can explore alternatives. One way would be to allocate nft_trans_rule objects + one nft_trans_chain object, deactivate the rules + the chain and then defer the freeing to the nft destroy workqueue. We'd still need to keep the synchronize_rcu path as a fallback to handle -ENOMEM corner cases though.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9eee6097ffb26cdd2adb988c0d378fa0d650c737 , < 5146c27b2780aac59876a887a5f4e793b8949862 (git)
Affected: 558f503f707f481bbf40efa74a938b8021df841d , < 2991dc357a28b61c13ed1f7b59e9251e2b4562fb (git)
Affected: a394c160d57f4b083bd904a22802f6fb7f5b3cea , < b8d8f53e1858178882b881b8c09f94ef0e83bf76 (git)
Affected: e6c32a64d61184c2bdf89442b3d31ef530afba34 , < b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3 (git)
Affected: bfd05c68e4c6320304e9f371ffa356b6e4b9cc53 , < 27f0574253f6c24c8ee4e3f0a685b75ed3a256ed (git)
Affected: c03d278fdf35e73dd0ec543b9b556876b9d9a8dc , < 7cf0bd232b565d9852cb25fd094f77254773e048 (git)
Affected: c03d278fdf35e73dd0ec543b9b556876b9d9a8dc , < b04df3da1b5c6f6dc7cdccc37941740c078c4043 (git)
Affected: cb401e5799e0acacb405f2128097e9c4ccf82f8a (git)
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    Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.6.67 , ≤ 6.6.* (semver)
Unaffected: 6.12.6 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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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\u0027t 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 -\u003euse 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\u0027t 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 \u003cTASK\u003e\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\u0027d still need to keep the synchronize_rcu path as\na fallback to handle -ENOMEM corner cases though."
        }
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        "dateUpdated": "2025-06-04T12:57:20.080Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "dateReserved": "2024-12-27T15:00:39.841Z",
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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.