CVE-2026-63992tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: tunnels: do not assume transport header in iptunnel_pmtud_check_icmp() In some cases, iptunnel_pmtud_check_icmp() can be called while skb transport header is not set. This triggers an out-of-bound access, because (typeof(skb->transport_header))~0U is 65535. Access the icmp header based on IPv4 network header, after making sure icmp->type is present in skb linear part. Note that iptunnel_pmtud_check_icmpv6()) is fine.
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 5a92cb45e34749865d03daf8d3500f77b5f6644c; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before c7b7ec3e69e673c0d6b57f74d21da50c485c598e; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 7f4f7efe7f30edd29c4988de01728bf2398217e4; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before a096b6e34f602950af9a2b0856cd93a5f4c276d7; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 43368636c663cff6e59dde93cf4b8e43ac28eb93; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before cb549df9ce4ee15c9d5b19ddab12cf2128e4313c; from 4cb47a8644cc9eb8ec81190a50e79e6530d0297f before 509323077ef79a26ba0c60bb556e45c12c398b2d | 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/5a92cb45e34749865d03daf8d3500f77b5f6644cpatch
- https://git.kernel.org/stable/c/c7b7ec3e69e673c0d6b57f74d21da50c485c598epatch
- https://git.kernel.org/stable/c/7f4f7efe7f30edd29c4988de01728bf2398217e4patch
- https://git.kernel.org/stable/c/e917d0c69f01af2bb4fbea2b66d560a53b3ac7ecpatch
- https://git.kernel.org/stable/c/a096b6e34f602950af9a2b0856cd93a5f4c276d7patch
- https://git.kernel.org/stable/c/43368636c663cff6e59dde93cf4b8e43ac28eb93patch
- https://git.kernel.org/stable/c/cb549df9ce4ee15c9d5b19ddab12cf2128e4313cpatch
- https://git.kernel.org/stable/c/509323077ef79a26ba0c60bb556e45c12c398b2dpatch
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.