Unknown

CVE-2026-98370 — xfrm: fix compat ALLOCSPI request use-after-free

In the Linux kernel, the following vulnerability has been resolved: xfrm: fix compat ALLOCSPI request use-after-free xfrm_state_netlink() builds the ALLOCSPI response with dump_one_state(), which already calls alloc_compat() with the response skb and header. xfrm_alloc_userspi() then calls alloc_compat() again, but passes the original request skb and its header. For a compat request, the translator therefore interprets the 228-byte compat xfrm_userspi_info as the 232-byte native layout and reads four bytes past the declared payload. It also publishes the translated child through the request's frag_list. A multicast clone of the request shares skb_shared_info and can observe that child. xfrm_user_rcv_msg() frees it after the request handler returns, racing a compat receiver which may still be copying from it and resulting in a use-after-free. Remove the redundant conversion. The response keeps its correct compat translation from dump_one_state(), and no child is attached to the inbound request.

Published Oct 6, 2026 · Updated Oct 13, 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

EPSS 0.2% (30-day exploitation probability)+1

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

0.17%

ahead of 6% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

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	≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < 494f2bee9d8d0ebcfa249ac41bed7fed26d119b4≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < 17893987e52918c23945c42e47e894a936305a25≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < 42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < 2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < bb63ab52a18273ec68340ac49aebbaa7b514ccd5≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < 248433942155b42a0ef04a5806c8aca024ea7c33≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < e70f639aee2ff0def155c256cace9e0f81d998e2≥ 5f3eea6b7e8f58cf5c8a9d4b9679dc19e9e67ba3 and < d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320 and 1 more version 5.10	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.17%

Detection

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

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 13, 2026
Affected products added · linux/linux
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Oct 6, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

git.kernel.org/stable/c/2b63341e2ebc9b6f73cbd9214dbe7d46dd98c718
NIST National Vulnerability Database
git.kernel.org/stable/c/d1ebd9081879fd9ae9c8fb7e8928f19cc88ae320
NIST National Vulnerability Database
git.kernel.org/stable/c/17893987e52918c23945c42e47e894a936305a25
NIST National Vulnerability Database
git.kernel.org/stable/c/e70f639aee2ff0def155c256cace9e0f81d998e2
NIST National Vulnerability Database
git.kernel.org/stable/c/42971ea17c7a8afc0bdd5ca40648bf4e5bb7b810
NIST National Vulnerability Database
git.kernel.org/stable/c/bb63ab52a18273ec68340ac49aebbaa7b514ccd5
NIST National Vulnerability Database
git.kernel.org/stable/c/248433942155b42a0ef04a5806c8aca024ea7c33
NIST National Vulnerability Database
git.kernel.org/stable/c/494f2bee9d8d0ebcfa249ac41bed7fed26d119b4
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 10h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 10h
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 CVSS score published by NVD, the CNA, CISA or GitHub so far.
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-2026-98370 is "xfrm: fix compat ALLOCSPI request use-after-free", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. 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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