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CVE-2026-68161— sctp: close UDP tunnel sockets during netns teardown

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于网络命名空间拆除期间未关闭SCTP UDP隧道套接字，可能导致命名空间被拆除时其UDP隧道套接字仍处于安装状态。

CVSS 9.8 · Critical EPSS 0.66% · P51

Possible ATT&CK Techniques 1 AI

T1562.001

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 046c052b475e7119b6a30e3483e2888fc606a2f8< c29affd44e6769e3073235d4b471d9b501fa8166 affected
046c052b475e7119b6a30e3483e2888fc606a2f8< c6eb2d615210b80339548ab07c0230edaab9a6c7 affected
046c052b475e7119b6a30e3483e2888fc606a2f8< 8ff78591d309c50a4fdab683b68dd8d512a270dd affected
046c052b475e7119b6a30e3483e2888fc606a2f8< 3bf0e349cbb4f975f35eb22753acc346b89c66a0 affected
046c052b475e7119b6a30e3483e2888fc606a2f8< 37ff9794be48d0caa37687e04d09675f9c849121 affected
046c052b475e7119b6a30e3483e2888fc606a2f8< ffb2bd7ade36ec4da32c46a6eddbf4515316d08c affected
5.11 affected
< 5.11 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-68161

Vulnerability Information
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Vulnerability Title
sctp: close UDP tunnel sockets during netns teardown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: close UDP tunnel sockets during netns teardown proc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when net.sctp.udp_port is set, and stops/restarts them when the sysctl value changes. The netns exit path does not stop these sockets, so a namespace can be torn down while its SCTP UDP tunnel sockets are still installed. Close the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering the per-net sysctl table. This prevents new sysctl writes from racing in while the sockets are being released, and closes the sockets before the control socket is destroyed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于网络命名空间拆除期间未关闭SCTP UDP隧道套接字，可能导致命名空间被拆除时其UDP隧道套接字仍处于安装状态。
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 046c052b475e7119b6a30e3483e2888fc606a2f8 ~ c29affd44e6769e3073235d4b471d9b501fa8166 -
Linux Linux 5.11 -

II. Public POCs for CVE-2026-68161

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III. Intelligence Information for CVE-2026-68161

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Patches & Fixes for CVE-2026-68161 (6)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow
CVE-2026-68083 9.1 CRITICAL ksmbd: fix path resolution in ksmbd_vfs_kern_path_create

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68161

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