CVE-2026-63993
vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 19, 2026 |
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Affected Versions
Linux / Linux
4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 6b8bfce9d2f774d2c2243e0248e03efb99bba6c0 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 9257f56ac47ef1976bcd056cf986a9988eeec67a 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 8d435d68d71fb875876b722f4136caf74f2f48bd 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < dc3bfa050f873371e745bdf478b1f5b738e5733d 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 609e63312c29aad18026a1d3222e123d4b6b0feb 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 5303925e360527243b46a440a04667826bbc72b7 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < a493efd4336cf19122ae0e4cbb3d31b32d70deea 4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 7d9ef0cb271555d8cf39fefe6c981e1493b25ecf
Linux / Linux
5.9
References
git.kernel.org: https://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0 git.kernel.org: https://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a git.kernel.org: https://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd git.kernel.org: https://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d git.kernel.org: https://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb git.kernel.org: https://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7 git.kernel.org: https://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea git.kernel.org: https://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf