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CVE-2026-68123

openvswitch: fix GSO userspace truncation underflow

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in 50a6a85f3d6b1d22d8436848606cdef5d2c490b4; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in 2623c48cc3a8da9a1886fd8f65c0e348f4406fd6; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in e211b081901ffca76674082c73eeaed53524c369; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in a16eaaf7c0b0ccdef6166707d90ffbc6eebf6855; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in fbfa3ad2ad6f3a5624aba5211c46290fb98cc9dc; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in 100a23b1613e9218e0af654ef102352c713f0263; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in ea85dbcbe8d4056ecb54352f97743d138ea4c407; From f2a4d086ed4c588d32fe9b7aa67fead7280e7bf1 · fixed in 4032f8ed10fcb84d41c508dfb04be96589f78dfe

  • Linux Linux

    4.8

  • KernelLinux

    From 4.8.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org