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Review reviewCritical

CVE-2026-63922

Linux

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head. This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage.

CVSS
9.8
EPSS
-
- percentile
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

In the Linux kernel, the following vulnerability has been resolved: ipv6: exthdrs: refresh nh after handling HAO option ip6_parse_tlv() caches skb_network_header(skb) in nh while walking IPv6 TLVs. ipv6_dest_hao() may call pskb_expand_head() for a cloned skb, which can move the skb head and invalidate the cached network header pointer. Refresh nh after ipv6_dest_hao() returns so any trailing padding or TLVs are parsed from the current skb head. This matches the existing pattern used in ip6_parse_tlv() after helpers that can modify skb header storage.

Affected product and versions

Product
Linux
Affected versions
>= a831f5bbc89a9978795504be9e1ff412043f8f77 < b3ac54e5c905f86d22b502eacb5686a282c5659f, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < f8aabed3ff3e986920cf02a2a2785e08e586b234, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < 12d957979e4a800167842f1b42be6a606d227ebe, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < ff375ed1cba81392346c5bfbf0bb7a13b2946f99, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < 751db1b802a067b7fff25880f4e9f9152a171538, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < 9b6dcc0a39fd71752937f0b6b3973e1416085dcf, >= a831f5bbc89a9978795504be9e1ff412043f8f77 < f7b52afe3592eae66e160586b45a3f2242972c63, >= 2.6.19
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. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 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
CVE-2026-63922 — Linux | SECUFOCUS NOW