CVE-2026-63993
Critical · CVSS 9.8- CVSS
- 9.8
- nvd
- EPSS
- 0.18%
- 7th pct
- KEV
- No
- Class
- oss containerizable
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 packages
| Linux | Kernel | 5.11.0 → 5.15.210 |
| Linux | Kernel | 5.16.0 → 6.1.176 |
| Linux | Kernel | 5.9.0 → 5.10.259 |
| Linux | Kernel | 6.13.0 → 6.18.35 |
| Linux | Kernel | 6.19.0 → 7.0.12 |
| Linux | Kernel | 6.2.0 → 6.6.143 |
| Linux | Kernel | 6.7.0 → 6.12.93 |
References
- https://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7
- https://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0feb
- https://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0
- https://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecf
- https://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bd
- https://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67a
- https://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deea
- https://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733d
Status: profiled · ingested 2026-07-20T18:00:18.000Z