netfilter: nf_queue: pin bridge device while NFQUEUE holds fake dst

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72255
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:53 UTC
Updated2026-08-23 13:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_queue: pin bridge device while NFQUEUE holds fake dst The br_netfilter fake rtable is embedded in struct net_bridge and is attached to bridged packets with skb_dst_set_noref(). If such a packet is queued to NFQUEUE, __nf_queue() upgrades that fake dst with skb_dst_force(). At that point the queued skb can hold a real dst reference after bridge teardown has started. The problem is not that every bridged packet needs its own dst reference. The problem is that NFQUEUE can keep the bridge private fake dst alive after unregister begins. Fix this by keeping the bridge fake dst model unchanged and pinning the bridge master device only while the packet sits in NFQUEUE. Record the bridge device in nf_queue_entry when the queued skb carries a bridge fake dst, take a device reference for the queue lifetime, and drop it when the queue entry is freed. Also make sure queued entries are reaped when that bridge device goes down, and drop the redundant nf_bridge_info_exists() test from the fake dst detection. This keeps netdev_priv(br->dev) alive until verdict completion, so the embedded fake rtable and its metrics backing storage cannot be freed out from under dst_release(). It also avoids the constant refcount bump and avoids using ipv4-specific dst helpers for IPv6 bridge traffic.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001640000 probability, percentile 0.061030000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f 8dc51351472825500145eed5bddfb88b2ec32008 git Not specified
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f 430521af7fe8a9c08f5a2554224a35f11f51d99e git Not specified
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f 3f03a2d225c668283110ad5f9ff159ba4591e2c7 git Not specified
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f 01ace27af47801dd7f6b839e782b62863af979cc git Not specified
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f 0ca505346c5e2905ab7b5313af801fcf38f594a8 git Not specified
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f 47b3af24de5fbed4bf2952de0f5294ef1a338a26 git Not specified
CNA Linux Linux affected 34666d467cbf1e2e3c7bb15a63eccfb582cdd71f c9c9b37f8c5505224e8d206184df3bb668ee00cf git Not specified
CNA Linux Linux affected 3.18 Not specified
CNA Linux Linux unaffected 3.18 semver Not specified
CNA Linux Linux unaffected 5.15.217 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/47b3af24de5fbed4bf2952de0f5294ef1a338a26 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/01ace27af47801dd7f6b839e782b62863af979cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ca505346c5e2905ab7b5313af801fcf38f594a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8dc51351472825500145eed5bddfb88b2ec32008 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f03a2d225c668283110ad5f9ff159ba4591e2c7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/430521af7fe8a9c08f5a2554224a35f11f51d99e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9c9b37f8c5505224e8d206184df3bb668ee00cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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