Review reviewCritical

CVE-2026-63924

Linux

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() ipv6_hop_jumbo() calls pskb_trim_rcsum(), which can change skb pointers. Let's recompute nh pointer to make sure any change won't mess things up.

CVSS: 9.8
EPSS: -
CISA KEV: Not listed
Published: 2026.07.20

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b3ac54e5c905f86d22b502eacb5686a282c5659f, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 645b99b1a185c91a79bdac4c5de0f91b212d64f0, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9e883eaa878f4337b5873c706efb5a192364ed18, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < bddaa4dfc7f36e1ee343a0622f69288af2b9ace9, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 72af7beae774e46ed543f3f2f267bf0a141bfcdd, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c512e1c819dfbf6ae95ee7a44b65b9ad98979157, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2b56bbd928c030894c270cd33d60286326919458, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d47548a36639095939f4747d4c43f2271366f565, >= 2.6.12
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: Not available