Answer in brief
CVE-2026-63922 records a Critical severity (CVSS 9.8) vulnerability in ipv6: exthdrs: refresh nh after handling HAO option. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a831f5bbc89a9978795504be9e1ff412043f8f77 <b3ac54e5c905f86d22b502eacb5686a282c5659f || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <f8aabed3ff3e986920cf02a2a2785e08e586b234 || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <12d957979e4a800167842f1b42be6a606d227ebe || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <ff375ed1cba81392346c5bfbf0bb7a13b2946f99 || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <751db1b802a067b7fff25880f4e9f9152a171538 || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <9b6dcc0a39fd71752937f0b6b3973e1416085dcf || >=a831f5bbc89a9978795504be9e1ff412043f8f77 <f7b52afe3592eae66e160586b45a3f2242972c63 | b3ac54e5c905f86d22b502eacb5686a282c5659f, f8aabed3ff3e986920cf02a2a2785e08e586b234, 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1, 12d957979e4a800167842f1b42be6a606d227ebe, ff375ed1cba81392346c5bfbf0bb7a13b2946f99, 751db1b802a067b7fff25880f4e9f9152a171538, 9b6dcc0a39fd71752937f0b6b3973e1416085dcf, f7b52afe3592eae66e160586b45a3f2242972c63 |
| Linux/Linuxgeneric | 2.6.19 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.