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NVD / CVE Program· CNA Linux

CVE-2026-68338: net/packet: avoid fanout hook re-registration after unregister

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0a052e0808e015e68144a9877e6ef42b952c49fa, 1bc55c29cd85818e9052f17deb287d5a11fb817f, 4628efbdc7affd094181f5263e65c1062e31f15f; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0a052e0808e015e68144a9877e6ef42b952c49fa, 1bc55c29cd85818e9052f17deb287d5a11fb817f, 4628efbdc7affd094181f5263e65c1062e31f15f; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: net/packet: avoid fanout hook re-registration after unregister packet_set_ring() temporarily detaches a socket from packet delivery while reconfiguring its ring. It records the previous running state, clears po->num, unregisters the protocol hook when needed, drops po->bind_lock, and later restores po->num and re-registers the hook from the saved was_running value. That unlocked window can race with NETDEV_UNREGISTER. The notifier can observe the socket as not running, skip __unregister_prot_hook(), and invalidate the per-socket binding by setting po->ifindex to -1 and clearing po->prot_hook.dev. A one-member fanout group can still retain its shared fanout hook device pointer. When packet_set_ring() resumes, re-registering solely from the stale was_running state can re-add the fanout hook after the device has been unregistered. Treat po->ifindex == -1 as an invalidated binding after reacquiring po->bind_lock. This is distinct from ifindex 0, the normal unbound/wildcard state: ifindex -1 marks an existing device binding that was invalidated when the device was unregistered. Restore po->num as before, but do not re-register the hook if device unregister already detached the socket.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.1affected
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before acb40ebfa5c4d62f84339fcbf713f2a9fd033a71affected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before c820f4b7f2fa38f8769db0d0cefdd94e2721504daffected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before 4628efbdc7affd094181f5263e65c1062e31f15faffected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before 80ec024d53a05c60ad1d08968dcf745f10c1665caffected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before 0a052e0808e015e68144a9877e6ef42b952c49faaffected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before 1bc55c29cd85818e9052f17deb287d5a11fb817faffected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before a885387dae7986a55bae5c77a15bdd447f64e9b9affected · git
    • dc99f600698dcac69b8f56dda9a8a00d645c5ffc and later · before 50aff80475abd3533eef4320477037e6fcc6b56eaffected · git
    • before 3.1not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2

+93

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68335Aug 10, 2026 · rds: drop incoming messages that cross network namespace boundaries
    31Monitor
  • ← EarlierCVE-2026-68336Aug 10, 2026 · bonding: fix devconf_all NULL dereference when IPv6 is disabled
    0Monitor
  • Later →CVE-2026-68343Aug 10, 2026 · smb: client: validate DFS referral PathConsumed
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0a052e0808e015e68144a9877e6ef42b952c49faVendor (CNA)
Linux Linux1bc55c29cd85818e9052f17deb287d5a11fb817fVendor (CNA)
Linux Linux4628efbdc7affd094181f5263e65c1062e31f15fVendor (CNA)
Linux Linux50aff80475abd3533eef4320477037e6fcc6b56eVendor (CNA)
Linux Linux80ec024d53a05c60ad1d08968dcf745f10c1665cVendor (CNA)
Linux Linuxa885387dae7986a55bae5c77a15bdd447f64e9b9Vendor (CNA)
Linux Linuxacb40ebfa5c4d62f84339fcbf713f2a9fd033a71Vendor (CNA)
Linux Linuxc820f4b7f2fa38f8769db0d0cefdd94e2721504dVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.178.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.178.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)
rocky linux:kernel0:4.18.0-553.178.1.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-553.178.1.rt7.519.el8_10 · Rocky Linux:8Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-720645 days apartnet: mana: Sync page pool RX frags for CPU
    39Monitor
  • CVE-2026-6397822 days apartnet/handshake: Drain pending requests at net namespace exit
    39Monitor
  • CVE-2026-683290 days apartiommu/amd: Wait for completion instead of returning early in iommu_completion_wait()
    35Monitor
  • CVE-2026-645616 days apartKVM: x86: Check for invalid/obsolete root *after* making MMU pages available
    35Monitor
  • CVE-2026-682000 days apartALSA: timer: don't re-enter an instance callback that is still running
    31Monitor
  • CVE-2026-682730 days apartdrm/amdgpu: Fix context pstate override handling
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-362 · Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records