CVE-2026-63993vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
Updated under an hour ago ()
Does this affect you?
It affects Linux and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 6b8bfce9d2f774d2c2243e0248e03efb99bba6c0; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 9257f56ac47ef1976bcd056cf986a9988eeec67a; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 8d435d68d71fb875876b722f4136caf74f2f48bd; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before dc3bfa050f873371e745bdf478b1f5b738e5733d; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 609e63312c29aad18026a1d3222e123d4b6b0feb; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 5303925e360527243b46a440a04667826bbc72b7; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before a493efd4336cf19122ae0e4cbb3d31b32d70deea; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 7d9ef0cb271555d8cf39fefe6c981e1493b25ecf | CNA record |
linux linux_kernel linux:linux_kernel | from 5.9 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/6b8bfce9d2f774d2c2243e0248e03efb99bba6c0patch
- https://git.kernel.org/stable/c/9257f56ac47ef1976bcd056cf986a9988eeec67apatch
- https://git.kernel.org/stable/c/8d435d68d71fb875876b722f4136caf74f2f48bdpatch
- https://git.kernel.org/stable/c/dc3bfa050f873371e745bdf478b1f5b738e5733dpatch
- https://git.kernel.org/stable/c/609e63312c29aad18026a1d3222e123d4b6b0febpatch
- https://git.kernel.org/stable/c/5303925e360527243b46a440a04667826bbc72b7patch
- https://git.kernel.org/stable/c/a493efd4336cf19122ae0e4cbb3d31b32d70deeapatch
- https://git.kernel.org/stable/c/7d9ef0cb271555d8cf39fefe6c981e1493b25ecfpatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.