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Review reviewHigh

CVE-2026-45859

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: do shared-unconfirmed check before segmentation Ulrich reports a regression with nfqueue: If an application did not set the 'F_GSO' capability flag and a gso packet with an unconfirmed nf_conn entry is received all packets are now dropped instead of queued, because the check happens after skb_gso_segment(). In that case, we did have exclusive ownership of the skb and its associated conntrack entry. The elevated use count is due to skb_clone happening via skb_gso_segment(). Move the check so that...

CVSS
7.5
EPSS
0.61%
45.9% percentile
CISA KEV
Not listed
Published
2026.05.27
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.61%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: do shared-unconfirmed check before segmentation Ulrich reports a regression with nfqueue: If an application did not set the 'F_GSO' capability flag and a gso packet with an unconfirmed nf_conn entry is received all packets are now dropped instead of queued, because the check happens after skb_gso_segment(). In that case, we did have exclusive ownership of the skb and its associated conntrack entry. The elevated use count is due to skb_clone happening via skb_gso_segment(). Move the check so that...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
7d8dc1c7be8d3509e8f5164dd5df64c8e34d7eeb, 6c4a0ba674f410ab99a30a16f32dac0ebfed5cd3, 6dcc8ba8a6074bb79040f502dc66ad23a58a1c86, 74e6eb7fd27ef1ccc68041dbc66e6d80d2e4a1a0, 025b3326c5c409b372d0103ad30f174e55adbd1b, 5.15.166, 6.1.107, 6.6.48, 6.10.7, 6.11, >= 5.15.166 < 5.16, >= 6.1.107 < 6.2, >= 6.6.48 < 6.7, >= 6.10.7 < 6.11, >= 6.11.1 < 6.12.75, >= 6.13 < 6.18.14, >= 6.19 < 6.19.4
Fixed versions
5.16, 6.2, 6.7, 6.11, 6.12.75, 6.18.14, 6.19.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available