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CVE-2026-68338— net/packet: avoid fanout hook re-registration after unregister

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 3.1版本存在安全漏洞，该漏洞源于packet_set_ring()重新配置环时暂时分离套接字，与NETDEV_UNREGISTER存在竞争条件，可能导致设备注销后fanout钩子被重新注册。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1205.001 · Port Knocking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux dc99f600698dcac69b8f56dda9a8a00d645c5ffc< acb40ebfa5c4d62f84339fcbf713f2a9fd033a71 affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< c820f4b7f2fa38f8769db0d0cefdd94e2721504d affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< 4628efbdc7affd094181f5263e65c1062e31f15f affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< 80ec024d53a05c60ad1d08968dcf745f10c1665c affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< 0a052e0808e015e68144a9877e6ef42b952c49fa affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< 1bc55c29cd85818e9052f17deb287d5a11fb817f affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< a885387dae7986a55bae5c77a15bdd447f64e9b9 affected
dc99f600698dcac69b8f56dda9a8a00d645c5ffc< 50aff80475abd3533eef4320477037e6fcc6b56e affected
… +10 more rows
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I. Basic Information for CVE-2026-68338

Vulnerability Information
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Vulnerability Title
net/packet: avoid fanout hook re-registration after unregister
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/packet: avoid fanout hook re-registration after unregister packet_set_ring() temporarily detaches a socket from packet delivery while reconfiguring its ring. It records the previous running state, clears po->num, unregisters the protocol hook when needed, drops po->bind_lock, and later restores po->num and re-registers the hook from the saved was_running value. That unlocked window can race with NETDEV_UNREGISTER. The notifier can observe the socket as not running, skip __unregister_prot_hook(), and invalidate the per-socket binding by setting po->ifindex to -1 and clearing po->prot_hook.dev. A one-member fanout group can still retain its shared fanout hook device pointer. When packet_set_ring() resumes, re-registering solely from the stale was_running state can re-add the fanout hook after the device has been unregistered. Treat po->ifindex == -1 as an invalidated binding after reacquiring po->bind_lock. This is distinct from ifindex 0, the normal unbound/wildcard state: ifindex -1 marks an existing device binding that was invalidated when the device was unregistered. Restore po->num as before, but do not re-register the hook if device unregister already detached the socket.
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基金会开源的一个操作系统内核。 Linux kernel 3.1版本存在安全漏洞，该漏洞源于packet_set_ring()重新配置环时暂时分离套接字，与NETDEV_UNREGISTER存在竞争条件，可能导致设备注销后fanout钩子被重新注册。
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 dc99f600698dcac69b8f56dda9a8a00d645c5ffc ~ acb40ebfa5c4d62f84339fcbf713f2a9fd033a71 -
Linux Linux 3.1 -

II. Public POCs for CVE-2026-68338

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III. Intelligence Information for CVE-2026-68338

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Patches & Fixes for CVE-2026-68338 (7)

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

CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
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-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

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-2026-68338

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