cve-2024-42109
Vulnerability from cvelistv5
Published
2024-07-30 07:46
Modified
2024-12-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally flush pending work before notifier syzbot reports: KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831 KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530 KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45 [..] Workqueue: events nf_tables_trans_destroy_work Call Trace: nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline] nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline] nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Problem is that the notifier does a conditional flush, but its possible that the table-to-be-removed is still referenced by transactions being processed by the worker, so we need to flush unconditionally. We could make the flush_work depend on whether we found a table to delete in nf-next to avoid the flush for most cases. AFAICS this problem is only exposed in nf-next, with commit e169285f8c56 ("netfilter: nf_tables: do not store nft_ctx in transaction objects"), with this commit applied there is an unconditional fetch of table->family which is whats triggering the above splat.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0Patch
Impacted products
Vendor Product Version
Linux Linux Version: f22954f8c58fd5f5489f5980796914e306757e77
Version: 41841b585e53babdfb0fa6fdfa54f6d7c28c1206
Version: 2c9f0293280e258606e54ed2b96fa71498432eae
Version: 2c9f0293280e258606e54ed2b96fa71498432eae
Version: 2c9f0293280e258606e54ed2b96fa71498432eae
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   Linux Linux Version: 6.5
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\"2c9f0293280e\", \"lessThan\": \"09e650c3a3a7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"2c9f0293280e\", \"lessThan\": \"9f6958ba2e90\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nf_tables_api.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.163\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.98\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.9.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nf_tables_api.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4\"}, {\"url\": \"https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c\"}, {\"url\": \"https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1\"}, {\"url\": \"https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e\"}, {\"url\": \"https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nf_tables: unconditionally flush pending work before notifier\\n\\nsyzbot reports:\\n\\nKASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831\\nKASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530\\nKASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597\\nRead of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45\\n[..]\\nWorkqueue: events nf_tables_trans_destroy_work\\nCall Trace:\\n nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]\\n nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]\\n nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597\\n\\nProblem is that the notifier does a conditional flush, but its possible\\nthat the table-to-be-removed is still referenced by transactions being\\nprocessed by the worker, so we need to flush unconditionally.\\n\\nWe could make the flush_work depend on whether we found a table to delete\\nin nf-next to avoid the flush for most cases.\\n\\nAFAICS this problem is only exposed in nf-next, with\\ncommit e169285f8c56 (\\\"netfilter: nf_tables: do not store nft_ctx in transaction objects\\\"),\\nwith this commit applied there is an unconditional fetch of\\ntable->family which is whats triggering the above splat.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:37:35.327Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-42109\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:37:35.327Z\", \"dateReserved\": \"2024-07-29T15:50:41.176Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-30T07:46:04.194Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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