High

CVE-2026-98899 — netfilter: ipset: mark the rcu locked areas properly

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: mark the rcu locked areas properly When we bump the uref counter, there's no need to keep the rcu lock because the referred hash table can't disappear. Also, from the same reason in mtype_gc we need the rcu lock and not a spinlock.

Published Oct 23, 2026 · Updated Oct 26, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · 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
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

0.17%

ahead of 6% of scored CVEs · Oct 30, 2026

Affects

Linux

CVSS base

7.8

High · 3 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	≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < 67bd3d2350d17c2f4fb158c3f917c10b15ecbc94≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < 892399abd1a005a455d5b74d86d82b9773405f2b≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < eee5172741b2c0e73210020732043e5d589295d3≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < ecb48c6b9edc78de8dd456c365727ae14b88c1ee≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < 0c46c9ce24130657ec7460c27fba5d445f5abd06≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < ca9fab1ca15534cef1630e81a479e94b3bbcdb6a≥ f66ee0410b1c3481ee75e5db9b34547b4d582465 and < 5d0c22e73656d050daffad10a2ba8765ce8441c8version 5dd9488ae41070b69d2f4acb580f77db5705f9ca and 4 more version a469bab3386aebff33c59506f3a95e35b91118fd≥ 5.4.24 and < 5.5≥ 5.5.8 and < 5.6version 5.6	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	—	—	GitHub, Inc. via GitHub Security Advisories
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)

EPSS over time FIRST

Oct 24, 2026 → Oct 30, 2026 · 7 reading(s) · max 0.22%

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 removed · 14
Oct 26, 2026 · CVE Program (cve.org) e CISA ADP
Affected products added · linux/linux
Oct 26, 2026 · CVE Program (cve.org) e CISA ADP
CVSS changed · 7.8
Oct 24, 2026 · NIST National Vulnerability Database
Record published
Oct 23, 2026
Affected products added · linux/linux
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 23, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 23, 2026 · Alertas do Telegram
CVE published
Oct 23, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 23, 2026 – Oct 24, 2026
1× Official description updated · Oct 23, 2026 – Oct 23, 2026

References

9 on the record

nvd.nist.gov/vuln/detail/CVE-2026-98899
GitHub Security Advisories
github.com/advisories/GHSA-ffrw-gp84-hx8m
GitHub Security Advisories
git.kernel.org/stable/c/ecb48c6b9edc78de8dd456c365727ae14b88c1ee
NIST National Vulnerability Database
git.kernel.org/stable/c/5d0c22e73656d050daffad10a2ba8765ce8441c8
NIST National Vulnerability Database
git.kernel.org/stable/c/ca9fab1ca15534cef1630e81a479e94b3bbcdb6a
NIST National Vulnerability Database
git.kernel.org/stable/c/67bd3d2350d17c2f4fb158c3f917c10b15ecbc94
NIST National Vulnerability Database
git.kernel.org/stable/c/eee5172741b2c0e73210020732043e5d589295d3
NIST National Vulnerability Database
git.kernel.org/stable/c/0c46c9ce24130657ec7460c27fba5d445f5abd06
NIST National Vulnerability Database
git.kernel.org/stable/c/892399abd1a005a455d5b74d86d82b9773405f2b
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 3d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 3d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 3d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 3d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 3d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 3d

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-2026-98899 is "netfilter: ipset: mark the rcu locked areas properly", 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. 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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