CVE-2026-89563High· 7.0▾ TwilightA flaw was found in the `ip6_tunnel` module of the Linux kernel. Incorrect handling of socket buffers (skb) during headroom reallocation in the `ip6_tnl_xmit()` function can lead to a double-free vulnerability. This occurs when an error pa…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 38.5 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 4.4
none → medium
— → 4.4
none → medium
— → 7.8
none → high
7.8 → 4.4
high → medium
4.4 → 7.8
medium → high
Last analysed / modified upstream
7.8 → 7
A flaw was found in the ip6_tunnel module of the Linux kernel. Incorrect handling of socket buffers (skb) during headroom reallocation in the ip6_tnl_xmit() function can lead to a double-free vulnerability. This occurs when an error path is taken after the original skb has been consumed, but the caller still holds a pointer to it, potentially allowing the same memory to be freed twice. This memory corruption issue could lead to a denial of service or potentially arbitrary code execution.
kernel: ip6_tunnel: use skb_cow_head() in ip6_tnl_xmit() — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-18.
Affected:
No fix planned:
Not affected:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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