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CVE PROGRAM SOURCE RECORD9.8 Critical

CVE-2026-63993

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < 6b8bfce9d2f774d2c2243e0248e03efb99bba6c0affected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < 9257f56ac47ef1976bcd056cf986a9988eeec67aaffected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < 8d435d68d71fb875876b722f4136caf74f2f48bdaffected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < dc3bfa050f873371e745bdf478b1f5b738e5733daffected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < 609e63312c29aad18026a1d3222e123d4b6b0febaffected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < 5303925e360527243b46a440a04667826bbc72b7affected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < a493efd4336cf19122ae0e4cbb3d31b32d70deeaaffected
  • 4cb47a8644cc9eb8ec81190a50e79e6530d0297f to < 7d9ef0cb271555d8cf39fefe6c981e1493b25ecfaffected

Linux Linux

Default version status: affected

  • 5.9affected
  • 0 to < 5.9unaffected
  • 5.10.259 to ≤ 5.10.*unaffected
  • 5.15.210 to ≤ 5.15.*unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.93 to ≤ 6.12.*unaffected
  • 6.18.35 to ≤ 6.18.*unaffected
  • 7.0.12 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References