CVE-2024-42109
Linux Linux netfilter nf_tables Kernel Stack Use After Free (UAF) Vuln
Description
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.
INFO
Published Date :
July 30, 2024, 8:15 a.m.
Last Modified :
Aug. 27, 2024, 1:44 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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CVE-2024-42109.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2024-42109 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-42109 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Aug. 27, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e No Types Assigned https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e Patch Changed Reference Type https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4 No Types Assigned https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4 Patch Changed Reference Type https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c No Types Assigned https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c Patch Changed Reference Type https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1 No Types Assigned https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1 Patch Changed Reference Type https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0 No Types Assigned https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0 Patch Added CWE NIST NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15.129 up to (excluding) 5.15.163 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.50 up to (excluding) 6.1.98 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.5 up to (excluding) 6.6.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.9.9 -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 30, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0 [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-42109 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-42109
weaknesses.