CVE-2026-74747
Description
In the Linux kernel, the following vulnerability has been resolved: ipvs: revalidate ihl to prevent out-of-bounds access While the outer IP header is already pulled into the skb head, we must be careful and revalidate the embedded headers after reading them from the skb frags to prevent out-of-bounds access. One such place reported by Sashiko is ip_vs_nat_icmp() where local process can change the ihl field and after skb_ensure_writable() we can see larger value which is a problem for the ip_send_check(cih) calls. Add check to drop the packet if the ihl field is changed.
How to fix
- Linux Linuxf55bb94946fb8ee6304590a731c39c1fbc3b28bc, 2512289cbf58706fd558e8fccea4e28003a2af54, 041b2303c8019394735c1f76c5138657bf660a7d, eb81c8e758f49e04391f77d9470a6232bb5f1c7a, 5365f012451fce2453f13a568dcb72ea534c1e4d, d93660df4dd1d116f608ada4a29a80a5d6f0a6ed or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < f55bb94946fb8ee6304590a731c39c1fbc3b28bc, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 2512289cbf58706fd558e8fccea4e28003a2af54, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 041b2303c8019394735c1f76c5138657bf660a7d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < eb81c8e758f49e04391f77d9470a6232bb5f1c7a, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 5365f012451fce2453f13a568dcb72ea534c1e4d, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < d93660df4dd1d116f608ada4a29a80a5d6f0a6ed, 2.6.12 | f55bb94946fb8ee6304590a731c39c1fbc3b28bc, 2512289cbf58706fd558e8fccea4e28003a2af54, 041b2303c8019394735c1f76c5138657bf660a7d, eb81c8e758f49e04391f77d9470a6232bb5f1c7a, 5365f012451fce2453f13a568dcb72ea534c1e4d, d93660df4dd1d116f608ada4a29a80a5d6f0a6ed |
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