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CVE-2026-74695— netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()

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_flow_table：在调用 之前，先释放已有的 skb 目的路径（dst）引用 经过 netfilter 流表卸载钩子（或 XFRM 卸载路径）处理的数据包（skbs）可能已经携带了一个在早期接收（RX）或路由阶段分配的、具有引用计数的 。 当 skb 已经持有引用计数的 时，若调用 ，将会覆盖 ，导致前一个 的引用计数泄漏，并在 中触发 断言失败，具体警告如下： 解决方法是：在设置非引用计数的流表目的路径之前，通过调用 先释放任何已有的

CVSS 7.5 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 2a79fd3908acd88e6cb0e620c314d7b1fee56a02< 12afa450a6a6c0cce2c42b7545a9958f62d8a00c affected
2a79fd3908acd88e6cb0e620c314d7b1fee56a02< 538e67e8c7889cf5f93951f5309d1bcb41f86036 affected
2a79fd3908acd88e6cb0e620c314d7b1fee56a02< 8aecf0bbcc72605592134c917c222207d8f63ab0 affected
b4b1adf2e66ecc7125c4117e7aad9ff61e2cfd27 affected
209dedf806d31095968f54323dbe62525b077b33 affected
4.16.15< 4.17 affected
4.17.1< 4.18 affected
4.18 affected
… +4 more rows
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I. Basic Information for CVE-2026-74695

Vulnerability Information
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Vulnerability Title
netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_flow_table: drop existing skb dst before skb_dst_set_noref() Incoming skbs passing through netfilter flowtable offload hooks (or XFRM offload path) might already carry a ref-counted dst_entry assigned during earlier RX or routing steps. Calling skb_dst_set_noref() when skb already holds a ref-counted dst overwrites skb->_skb_refdst, leaking the previous dst_entry reference count and triggering a DEBUG_NET_WARN_ON_ONCE assertion in skb_dst_check_unset(): WARNING: at skb_dst_check_unset include/linux/skbuff.h:1170 WARNING: at skb_dst_set_noref include/linux/skbuff.h:1234 WARNING: at nf_flow_offload_ip_hook+0xf6c/0x2b60 net/netfilter/nf_flow_table_ip.c:864 Drop any existing dst_entry reference with skb_dst_drop(skb) before setting the non-referenced flowtable destination.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 2a79fd3908acd88e6cb0e620c314d7b1fee56a02 ~ 12afa450a6a6c0cce2c42b7545a9958f62d8a00c -
Linux Linux 4.18 -

II. Public POCs for CVE-2026-74695

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III. Intelligence Information for CVE-2026-74695

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Patches & Fixes for CVE-2026-74695 (3)

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

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

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-2026-74695

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