High

CVE-2026-97524 — mptcp: avoid unneeded actions on subflow reset

In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid unneeded actions on subflow reset Once in a blue moon, the mptcp receive path can recursively call mptcp_data_ready() via state change under unlucky error conditions, and then try to hold the data lock again. Break the recursion loop explicitly checking for the exceptional condition. Add a new flag instead of using an existing one like 'closing', to exit early in subflow_state_change(), and explicitly flush the RX queue at reset time. This avoids unneeded processing to check for available data -- calling get_mapping_status() and more on a dying subflow -- but also in error reporting and worker scheduling. Note that we must consume the currently peeked skb before invoking mptcp_dss_corruption to avoid consuming it again after the eventual reset has freed it.

Published Sep 25, 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

EPSS 0.7% (30-day exploitation probability)+8
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

0.69%

ahead of 52% of scored CVEs · Oct 15, 2026

Affects

Linux

CVSS base

7.5

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).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
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	≥ fde99e972b8f88cebe619241d7aa43d288ef666a and < 6d669c740933124eae3df8cfc15995af9bcc6aba≥ 12c1676d598e3b8dd92a033b623b792cc2ea1ec5 and < 83a7dcdd2b1060484528da70a643125174d47e5a≥ 35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25 and < a370e56024df0b07e3120c45a9773ae123819fd6≥ b8be15d1ae7ea4eedd547c3b3141f592fbddcd30 and < 1962841387087970d75ba8b8d4c2aa2d45705e50≥ e32d262c89e2b22cb0640223f953b548617ed8a6 and < 4b7abdcb5ba832fafab679f0d998af39cbc99307≥ e32d262c89e2b22cb0640223f953b548617ed8a6 and < b2dbcc1ed48b5ac070a41db4a52aade6823c4df0≥ e32d262c89e2b22cb0640223f953b548617ed8a6 and < ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f≥ e32d262c89e2b22cb0640223f953b548617ed8a6 and < 2b0f561f21b27c40c91ea4975268a06092bd7e9c and 7 more version 8bfd391bde685df7289b928ce8876a3583be4bfb≥ 5.10.228 and < 5.10.271≥ 5.15.169 and < 5.15.222≥ 6.1.113 and < 6.1.189≥ 6.6.57 and < 6.6.158≥ 6.11.4 and < 6.12version 6.12	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

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

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
7.5	CVSS 3.1	High	3.9	3.6	416baaa9-dc9f-4396-8d5f-8c081fb06d67 via NIST National Vulnerability Database
7.5	CVSS 3.1	High	—	—	Linux via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

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 · 7.5
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
Sep 25, 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/1962841387087970d75ba8b8d4c2aa2d45705e50
NIST National Vulnerability Database
git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0
NIST National Vulnerability Database
git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6
NIST National Vulnerability Database
git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a
NIST National Vulnerability Database
git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f
NIST National Vulnerability Database
git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba
NIST National Vulnerability Database
git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307
NIST National Vulnerability Database
git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c
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 1d
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 1d
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 2d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 2d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 2d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 2d

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 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-2026-97524 is "mptcp: avoid unneeded actions on subflow reset", 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 7.5 describes technical severity. EPSS 0.69% 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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