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CVE-2026-68123— openvswitch: fix GSO userspace truncation underflow

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 4.8版本存在安全漏洞，该漏洞源于openvswitch中GSO用户空间截断处理不当，导致长度下溢。

CVSS 9.8 · Critical EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< 50a6a85f3d6b1d22d8436848606cdef5d2c490b4 affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6 affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< e211b081901ffca76674082c73eeaed53524c369 affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855 affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< 100a23b1613e9218e0af654ef102352c713f0263 affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< ea85dbcbe8d4056ecb54352f97743d138ea4c407 affected
f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1< 4032f8ed10fcb84d41c508dfb04be96589f78dfe affected
… +10 more rows
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I. Basic Information for CVE-2026-68123

Vulnerability Information
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Vulnerability Title
openvswitch: fix GSO userspace truncation underflow
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: openvswitch: fix GSO userspace truncation underflow OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb length in OVS_CB(skb)->cutlen. When a later userspace action segments a GSO skb, queue_gso_packets() reuses that delta for each smaller segment. A segment can then reach queue_userspace_packet() with cutlen greater than skb->len, underflowing the length passed to skb_zerocopy(). Store the maximum preserved length instead and bound each consumer against the current skb length. Use U32_MAX as the no-truncation sentinel so the value remains valid if skb geometry changes before a consumer handles it.
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 4.8版本存在安全漏洞，该漏洞源于openvswitch中GSO用户空间截断处理不当，导致长度下溢。
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 f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 ~ 50a6a85f3d6b1d22d8436848606cdef5d2c490b4 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-68123

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III. Intelligence Information for CVE-2026-68123

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Patches & Fixes for CVE-2026-68123 (8)

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

CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
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-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
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-2026-68123

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