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CVE-2026-63993

vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 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: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() skb_tunnel_check_pmtu() can change skb->head. Reusing old_iph afer skb_tunnel_check_pmtu() can cause an UAF. Use instead ip_hdr(skb) as done in drivers/net/bareudp.c and drivers/net/geneve.c. Found by Sashiko.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in 6b8bfce9d2f774d2c2243e0248e03efb99bba6c0; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in 9257f56ac47ef1976bcd056cf986a9988eeec67a; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in 8d435d68d71fb875876b722f4136caf74f2f48bd; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in dc3bfa050f873371e745bdf478b1f5b738e5733d; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in 609e63312c29aad18026a1d3222e123d4b6b0feb; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in 5303925e360527243b46a440a04667826bbc72b7; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in a493efd4336cf19122ae0e4cbb3d31b32d70deea; From 4cb47a8644cc9eb8ec81190a50e79e6530d0297f · fixed in 7d9ef0cb271555d8cf39fefe6c981e1493b25ecf

  • Linux Linux

    5.9

  • KernelLinux

    From 5.9.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.93; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12

References 8

git.kernel.org