High

CVE-2026-72450 — xfrm: validate selector family and prefixlen during match

In the Linux kernel, the following vulnerability has been resolved: xfrm: validate selector family and prefixlen during match syzbot reported a shift-out-of-bounds in xfrm_selector_match() due to AF_UNSPEC selector with large prefixlen (e.g. 128) matched against IPv4 flow (when XFRM_STATE_AF_UNSPEC is set). Fix this by: - Rejecting mismatched families in xfrm_selector_match. - Returning false in addr4_match if prefixlen > 32. - Returning false in addr_match if prefixlen > 128 (prevents overflow).

Published Aug 15, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Linux

CVSS base

7.8

High · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	version 401ad99a5ae7180dd9449eac104cb755f442e7f3version 6.12≥ 6.11.6 and < 6.12≥ 5.4.285 and < 5.5≥ 4.19.323 and < 4.20≥ 6.6.59 and < 6.6.145≥ 6.1.115 and < 6.1.178≥ 5.15.170 and < 5.15.212 and 11 more ≥ 5.10.229 and < 5.10.261version e68dd80ba498265d2266b12dc3459164f4ff0c4a≥ 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73 and < 87a5bbccc7ff4edb3f42fea387124237d2ba91eeversion f31398570acf0f0804c644006f7bfa9067106b0a≥ 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 and < 40f0b1047918539f0b0f795ac65e35336b4c2c78≥ 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 and < 5a03a2ee17e8259dde631ed84fd8322db06cb2ae≥ 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 and < 6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe≥ 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 and < 78783fefdc8f36879b1a17efa0d3195ea5f2dc5f≥ 7d9868180bd1e4cf37e7c5067362658971162366 and < efa9e3b9f3dea2e1ea4c7edf4edc863faef85986≥ bce1afaa212ec380bf971614f70909a27882b862 and < a3968ad4195d72c8fddcc6c0ef39da95ac98711a≥ 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71 and < bd7f202cf77556cff59f68dc30e4cdf40cb6e33b	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.8	CVSS 3.1	High	1.8	5.9	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
7.8	CVSS 3.1	High	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: 416baaa9-dc9f-4396-8d5f-8c081fb06d67)

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.8
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 15, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b
NIST National Vulnerability Database
git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae
NIST National Vulnerability Database
git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78
NIST National Vulnerability Database
git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a
NIST National Vulnerability Database
git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee
NIST National Vulnerability Database
git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe
NIST National Vulnerability Database
git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986
NIST National Vulnerability Database
git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 15h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 15h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-72450 is "xfrm: validate selector family and prefixlen during match", rated High. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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