netfilter: nf_tables: unconditionally flush pending work before notifier

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2024-42109
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-07-30 08:15:03 UTC
Updated2026-08-04 11:19:34 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f22954f8c58fd5f5489f5980796914e306757e77 3325628cb36b7f216c5716e7b5124d9dc81199e4 git Not specified
CNA Linux Linux affected 41841b585e53babdfb0fa6fdfa54f6d7c28c1206 4c06c13317b9a08decedcd7aaf706691e336277c git Not specified
CNA Linux Linux affected 2c9f0293280e258606e54ed2b96fa71498432eae 55a40406aac555defe9bdd0adec9508116ce7cb1 git Not specified
CNA Linux Linux affected 2c9f0293280e258606e54ed2b96fa71498432eae 09e650c3a3a7d804430260510534ccbf71c75b2e git Not specified
CNA Linux Linux affected 2c9f0293280e258606e54ed2b96fa71498432eae 9f6958ba2e902f9820c594869bd710ba74b7c4c0 git Not specified
CNA Linux Linux affected 4167aa477abcf62b0dfda51f3513280fa73cd588 git Not specified
CNA Linux Linux affected 5.15.129 5.15.163 semver Not specified
CNA Linux Linux affected 6.1.50 6.1.98 semver Not specified
CNA Linux Linux affected 6.4.13 6.5 semver Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 5.15.163 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.98 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.39 6.6.* semver Not specified
CNA Linux Linux unaffected 6.9.9 6.9.* semver Not specified
CNA Linux Linux unaffected 6.10 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
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