Unknown

CVE-2026-99211 — netlink: reset skb headers before unicast and multicast filtering

In the Linux kernel, the following vulnerability has been resolved: netlink: reset skb headers before unicast and multicast filtering Socket filters can use SKF_NET_OFF and SKF_LL_OFF to read relative to an skb's network and MAC headers. Netlink producers may reserve headroom without resetting those headers, allowing a receiving socket's filter to read data before the initialized message. For example, IWPM HELLO replies are allocated with dev_alloc_skb(), which reserves NET_SKB_PAD bytes. An unprivileged NETLINK_RDMA user can attach a classic socket filter and disclose this headroom through the length of the delivered reply. The resets in netlink_dump() do not help because IWPM sends a separately allocated skb through netlink_unicast(). Reset both headers before running the receiver's filter in unicast and broadcast delivery, as is already done for dump skbs. This also covers other netlink producers that reserve headroom without changing their allocation or message-building code.

Published Oct 28, 2026 · Updated Oct 28, 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

No scoring signals.

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

—

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	≥ b1153f29ee07dc1a788964409255a4b4fae50b98 and < 06791594274f87c29f1a9f1961d700272716a49d≥ b1153f29ee07dc1a788964409255a4b4fae50b98 and < 06935da5de83aa8b98841563894857e7d2f80e47≥ b1153f29ee07dc1a788964409255a4b4fae50b98 and < 8bf659bd54e1f00e34cf5244b1d289c506fa47c0version 2.6.26	Vulnerable	CVE Program (cve.org) e CISA ADP

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 28, 2026
Affected products added · linux/linux
Oct 28, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 28, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 28, 2026 · Alertas do Telegram
CVE published
Oct 28, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 28, 2026 – Oct 28, 2026
1× Official description updated · Oct 28, 2026 – Oct 28, 2026

References

3 on the record

git.kernel.org/stable/c/06935da5de83aa8b98841563894857e7d2f80e47
NIST National Vulnerability Database
git.kernel.org/stable/c/06791594274f87c29f1a9f1961d700272716a49d
NIST National Vulnerability Database
git.kernel.org/stable/c/8bf659bd54e1f00e34cf5244b1d289c506fa47c0
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 11h
Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 11h
Unknown CVE-2026-99214 drm/vc4: hdmi: Move packet RAM enable to PM runtime 11h
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 11h
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 11h
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 11h

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 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-2026-99211 is "netlink: reset skb headers before unicast and multicast filtering", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. 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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