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CVE

CVE-2026-63993

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

CVE-2026-63993

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

In the Linux kernel, the following vulnerability has been resolved:

vxlan: do not reuse cached iphdr() value after skbtunnelcheckpmtu()

skbtunnelcheck_pmtu() can change skb->head.

Reusing oldiph afer skbtunnelcheckpmtu() can cause an UAF.

Use instead ip_hdr(skb) as done in drivers/net/bareudp.c

and drivers/net/geneve.c.

Found by Sashiko.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

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, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63993.json, https://nvd.nist.gov/vuln/detail/CVE-2026-63993, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00514%
EPSS Percentile
0.4179%
Introduced Version
4cb47a8644cc9eb8ec81190a50e79e6530d0297f,5.9.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
7d9ef0cb271555d8cf39fefe6c981e1493b25ecf,5.10.259,5.15.210,6.1.176,6.6.143,6.12.93,6.18.35,7.0.12,6.1.176-1,6.12.94-1,7.0.0-28.28~24.04.1,7.0.0-1016.16~24.04.1,7.0.0-28.28.1~24.04.3,0:5.15.0-323.211.3.3.el8uek,0:6.12.0-206.104.3.3.el9uek,0:5.15.0-323.211.3.3.el9uek,0:6.12.0-206.104.3.3.el10uek,0:5.10.259-258.1043.amzn2,0:1.0-0.amzn2,0:5.15.210-148.245.amzn2,1:6.18.35-68.127.amzn2023,1:1.0-0.amzn2023,1:6.1.176-220.358.amzn2023,1:6.12.94-123.174.amzn2023

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