CVE-2026-74747
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
41/100
Published: 2026-08-26
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
Low Complexity
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
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.
Affected Software (7)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f55bb94946fb8ee6304590a731c39c1fbc3b28bc |
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2512289cbf58706fd558e8fccea4e28003a2af54 |
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 041b2303c8019394735c1f76c5138657bf660a7d |
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < eb81c8e758f49e04391f77d9470a6232bb5f1c7a |
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5365f012451fce2453f13a568dcb72ea534c1e4d |
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d93660df4dd1d116f608ada4a29a80a5d6f0a6ed |
| Linux | Linux | 2.6.12 |