CVE-2026-63993
In the Linux kernel, the following vulnerability has been resolved: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVSS
9.8
Critical
EPSS
0.2%
p7
KEV
—
Exploit Today
2
0-100
Published: Jul 19, 2026 · Last modified: Jul 20, 2026
Not enough EPSS history yet.
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.
- git.kernel.orghttps://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7
- git.kernel.orghttps://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb
- git.kernel.orghttps://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0
- git.kernel.orghttps://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf
- git.kernel.orghttps://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd
- git.kernel.orghttps://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a
- git.kernel.orghttps://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea
- git.kernel.orghttps://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d
No related CVEs by CWE or product.