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CVE-2024-42109— netfilter: nf_tables: unconditionally flush pending work before notifier

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于netfilter:nf_tables模块中在通知删除表之前，待处理的工作没有被无条件地刷新，可能导致释放后重用问题。

CVSS 7.8 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux f22954f8c58fd5f5489f5980796914e306757e77< 3325628cb36b7f216c5716e7b5124d9dc81199e4 affected
41841b585e53babdfb0fa6fdfa54f6d7c28c1206< 4c06c13317b9a08decedcd7aaf706691e336277c affected
2c9f0293280e258606e54ed2b96fa71498432eae< 55a40406aac555defe9bdd0adec9508116ce7cb1 affected
2c9f0293280e258606e54ed2b96fa71498432eae< 09e650c3a3a7d804430260510534ccbf71c75b2e affected
2c9f0293280e258606e54ed2b96fa71498432eae< 9f6958ba2e902f9820c594869bd710ba74b7c4c0 affected
4167aa477abcf62b0dfda51f3513280fa73cd588 affected
5.15.129< 5.15.163 affected
6.1.50< 6.1.98 affected
… +8 more rows
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I. Basic Information for CVE-2024-42109

Vulnerability Information
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Vulnerability Title
netfilter: nf_tables: unconditionally flush pending work before notifier
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于netfilter:nf_tables模块中在通知删除表之前，待处理的工作没有被无条件地刷新，可能导致释放后重用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f22954f8c58fd5f5489f5980796914e306757e77 ~ 3325628cb36b7f216c5716e7b5124d9dc81199e4 -
Linux Linux 6.5 -

II. Public POCs for CVE-2024-42109

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III. Intelligence Information for CVE-2024-42109

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Other References for CVE-2024-42109 (5)

Same Patch Batch · Linux · 2024-07-30 · 70 CVEs total

CVE-2024-42108 9.8 CRITICAL net: rswitch: Avoid use-after-free in rswitch_poll()
CVE-2024-42225 8.3 HIGH wifi: mt76: replace skb_put with skb_put_zero
CVE-2024-42120 7.8 HIGH drm/amd/display: Check pipe offset before setting vblank
CVE-2024-42117 7.8 HIGH drm/amd/display: ASSERT when failing to find index by plane/stream id
CVE-2024-42115 7.8 HIGH jffs2: Fix potential illegal address access in jffs2_free_inode
CVE-2024-42112 7.8 HIGH net: txgbe: free isb resources at the right time
CVE-2024-42111 7.8 HIGH btrfs: always do the basic checks for btrfs_qgroup_inherit structure
CVE-2024-42105 7.8 HIGH nilfs2: fix inode number range checks
CVE-2024-42104 7.8 HIGH nilfs2: add missing check for inode numbers on directory entries
CVE-2024-42103 7.8 HIGH btrfs: fix adding block group to a reclaim list and the unused list during reclaim
CVE-2024-42162 7.8 HIGH gve: Account for stopped queues when reading NIC stats
CVE-2024-42099 7.8 HIGH s390/dasd: Fix invalid dereferencing of indirect CCW data pointer
CVE-2024-42132 7.6 HIGH bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX
CVE-2024-42133 7.6 HIGH Bluetooth: Ignore too large handle values in BIG
CVE-2024-42110 7.5 HIGH net: ntb_netdev: Move ntb_netdev_rx_handler() to call netif_rx() from __netif_rx()
CVE-2024-42152 7.5 HIGH nvmet: fix a possible leak when destroy a ctrl during qp establishment
CVE-2024-42145 7.5 HIGH IB/core: Implement a limit on UMAD receive List
CVE-2024-42123 7.0 HIGH drm/amdgpu: fix double free err_addr pointer warnings
CVE-2024-42224 7.0 HIGH net: dsa: mv88e6xxx: Correct check for empty list
CVE-2024-42161 bpf: Avoid uninitialized value in BPF_CORE_READ_BITFIELD

Showing top 20 of 70 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-42109

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