CVE-2024-42109
- Source
- https://cve.org/CVERecord?id=CVE-2024-42109
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42109.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2024-42109
- Downstream
BELL (1)
DEBIAN (1)
MGASA (2)
OESA (1)
SUSE (5)
- Related
- Published
- 2024-07-30T07:46:04Z
- Modified
- 2026-10-20T10:31:18Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- netfilter: nf_tables: unconditionally flush pending work before notifier
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42109.json" }- References
-
- https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e
- https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4
- https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c
- https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1
- https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42109.json
- https://nvd.nist.gov/vuln/detail/CVE-2024-42109
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf22954f8c58fd5f5489f5980796914e306757e77Fixed3325628cb36b7f216c5716e7b5124d9dc81199e4
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced41841b585e53babdfb0fa6fdfa54f6d7c28c1206Fixed4c06c13317b9a08decedcd7aaf706691e336277c
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2c9f0293280e258606e54ed2b96fa71498432eaeFixed55a40406aac555defe9bdd0adec9508116ce7cb1Fixed09e650c3a3a7d804430260510534ccbf71c75b2eFixed9f6958ba2e902f9820c594869bd710ba74b7c4c0
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.15.129Fixed5.15.163
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.1.50Fixed6.1.98
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.4.13Fixed6.5
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4167aa477abcf62b0dfda51f3513280fa73cd588
Affected versions
v5.*
v6.*
Linux / Kernel
Package
- Name
- Kernel