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CVE-2026-74624— netfilter: nf_conntrack: defer invalid log until after unlock

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.

在 Linux 内核中，以下漏洞已得到修复： netfilter: nf_conntrack：在释放锁之后再延迟记录无效连接跟踪日志 TCP 和 SCTP 的连接跟踪处理路径可能会在仍持有 （连接跟踪锁）时发出无效数据包日志。 当无效日志通过 nfnetlink_log 路由并启用了连接跟踪导出功能时，日志处理路径可能会重新进入连接跟踪的 netlink 胶水层，从而再次转储相同的连接跟踪条目。由于协议属性转储操作可能需要获取 ，因此在持有该锁的同时进行日志记录可能导致死锁。 为解决此问题，对 TCP 无效日志的处

AI Predicted 4.4 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux d9a6f0d0df1899ff9086a57abc600e414f4b8cdd< 63853eb20bba4e00b7cd0b8cfc19337bbaaf5037 affected
d9a6f0d0df1899ff9086a57abc600e414f4b8cdd< 9480fcf70a5aa9d320088a01c95df0e5e6391f4a affected
d9a6f0d0df1899ff9086a57abc600e414f4b8cdd< 0424186d570aa4d1ad17f516afb86bd9eaa4f42e affected
d9a6f0d0df1899ff9086a57abc600e414f4b8cdd< c0224327b7cbed9d3198e8dbec847281053dcd06 affected
d9a6f0d0df1899ff9086a57abc600e414f4b8cdd< 2d19b95c9723001f214f7a47d67b09f46238f200 affected
6.1 affected
< 6.1 unaffected
6.6.152≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-74624

Vulnerability Information
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Vulnerability Title
netfilter: nf_conntrack: defer invalid log until after unlock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: defer invalid log until after unlock TCP and SCTP conntrack paths can emit invalid-packet logs while ct->lock is still held. When invalid logging is routed to nfnetlink_log and conntrack export is enabled, the log path can re-enter conntrack netlink glue and dump the same conntrack again. Protocol attribute dumping may take ct->lock, so logging while holding that lock can deadlock. Defer the TCP invalid logs by storing only the minimal log context while ct->lock is held and emitting the log after unlocking. Also make the TCP timeout-lowering invalid path return whether a log is needed, then emit that log after unlocking. Do the same for the SCTP invalid state-transition log that can be reached while ct->lock is held. Add a lockdep assertion to nf_ct_l4proto_log_invalid() so future callers that log invalid conntracks while holding ct->lock are caught outside TCP and SCTP as well.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux d9a6f0d0df1899ff9086a57abc600e414f4b8cdd ~ ca97360eba4b3dc67f1804625542f4ccc774242a -
Linux Linux 6.1 -

II. Public POCs for CVE-2026-74624

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III. Intelligence Information for CVE-2026-74624

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Patches & Fixes for CVE-2026-74624 (6)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74640 ALSA: FCP: fix OOB write in fcp_meter_ctl_get()
CVE-2026-74621 net/sched: act_ct: fix sk_buff leak when the header checks reject a packet
CVE-2026-74622 net: atlantic: free RX pages of consumed but not refilled buffers
CVE-2026-74623 net: atlantic: free stranded TX buffers on ring deinit
CVE-2026-74625 netfilter: bridge: release template ct on non-IP path
CVE-2026-74627 net: devmem: prevent net-iov / page mixing
CVE-2026-74626 NTB: ntb_netdev: Preserve RX queue depth on allocation failure
CVE-2026-74628 net/x25: fix use-after-free of the socket by its timers
CVE-2026-74629 net/dibs: Correct freeing of dmb_clientid_arr
CVE-2026-74631 net: smc: fix splice entry lifetime imbalance in smc_rx_splice
CVE-2026-74630 ipv6: prevent in6_dev_get() from resurrecting inet6_dev
CVE-2026-74632 mm/huge_memory: fix huge_zero_pfn race
CVE-2026-74633 tracing: Fix NULL pointer dereference in module event cache removal
CVE-2026-74634 ring-buffer: Prevent subbuf order change when resizing is disabled
CVE-2026-74635 fbdev: bitblit: bound-check glyph index in bit_cursor()
CVE-2026-74636 tracing: Fix race between update_event_fields and, event_define_fields
CVE-2026-74637 perf/core: Fix group leader use-after-free after sibling detach
CVE-2026-74639 ALSA: us144mkii: re-anchor capture URBs on resubmission
CVE-2026-74638 drm/v3d: Serialize the scheduler timeout handlers
CVE-2026-74651 staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74624

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