9.8

CVE-2026-63922: linux Use After Free

CVSS: 9.8v3.1CriticalAwaiting analysis
AliasesUBUNTU-CVE-2026-63922DEBIAN-CVE-2026-63922
Published 19-07-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-63922 is a critical (CVSS 9.8) Use After Free vulnerability in linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 48 · Related 42
OPENSUSE-SU-2026:21910-1RHSA-2026:76739RHSA-2026:77218RHSA-2026:77219RHSA-2026:83707RHSA-2026:83796

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

0.00 pp

From 0.71% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.71%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu167 products
  • linuxAll versions (No fix recorded) | < 5.15.0-194.204 | < 6.8.0-142.142 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1116.123 | < 6.8.0-1065.68 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
Linux1 product
  • linux≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < b3ac54e5c905f86d22b502eacb5686a282c5659f | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < f8aabed3ff3e986920cf02a2a2785e08e586b234 | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < 1a11eb7431e3d2882f5bd5939c5a9bbc65ccf4d1 | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < 12d957979e4a800167842f1b42be6a606d227ebe | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < ff375ed1cba81392346c5bfbf0bb7a13b2946f99 | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < 751db1b802a067b7fff25880f4e9f9152a171538 | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < 9b6dcc0a39fd71752937f0b6b3973e1416085dcf | ≥ a831f5bbc89a9978795504be9e1ff412043f8f77, < f7b52afe3592eae66e160586b45a3f2242972c63 | 2.6.19

3 vendors · 169 products

References

36 links
Show all 36 references