CVE - CVE-2024-42109

CVE-ID
CVE-2024-42109	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e URL:https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e MISC:https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4 URL:https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4 MISC:https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c URL:https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c MISC:https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1 URL:https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1 MISC:https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0 URL:https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0
Assigning CNA
kernel.org
Date Record Created
20240729	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240729)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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