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NVD / CVE Program· CNA Linux

CVE-2026-74623: net: atlantic: free stranded TX buffers on ring deinit

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 307d80193b4a4a75b8dc4e0d3162be3755abbed7, 3447641d361dcc5511841d986ad4d849b2900d9b, 452636ea5410a96e02ebaaf80b21e3620b98e0dd; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 307d80193b4a4a75b8dc4e0d3162be3755abbed7, 3447641d361dcc5511841d986ad4d849b2900d9b, 452636ea5410a96e02ebaaf80b21e3620b98e0dd; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 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: atlantic: free stranded TX buffers on ring deinit aq_vec_deinit() drains the TX rings with a single aq_ring_tx_clean() call, which frees at most AQ_CFG_TX_CLEAN_BUDGET (256) descriptors and stops at hw_head, which no longer moves once aq_vec_stop() has stopped the hardware and NAPI. Completed descriptors beyond the budget and everything still posted in [hw_head, sw_tail) keep their skb or xdp_frame when the interface goes down: aq_vec_ring_free() then frees the buffer ring and the references are lost for good. Today this is a silent memory leak on every interface down under TX/XDP_TX load. With the conversion of the RX path to page_pool posted for net-next it becomes much more visible: XDP_TX frames carry fragment references on the RX ring's page_pool, so a single stranded frame keeps the pool's inflight count above zero forever. page_pool_destroy() then never completes, the pool is leaked together with its pages, and "page_pool_release_retry() stalled pool shutdown" is warned every 60 seconds from that point on, on every ifdown, XDP detach or ring resize under XDP_TX load. Bring back aq_ring_tx_deinit() as it was before the removal and use it for teardown again, with one extension: TX rings can hold xdp_frames nowadays, so release those too. They are returned with xdp_return_frame() since this runs in process context.

—No exploit Fix available
Published
Aug 22, 2026
Updated
Nov 6, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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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

    • 4.11affected
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before a14ceebd13bf857bfca052bc5a6bd49e737912beaffected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before 4f1c20873f70b4b22ef86dc38dad1fda8e169bcdaffected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before 307d80193b4a4a75b8dc4e0d3162be3755abbed7affected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before 7a3e1481f4ee6c581bccc6bfc6c970aac5be7b0caffected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before 3447641d361dcc5511841d986ad4d849b2900d9baffected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before b13202d401e1a20fec89b0cda733dcbaf279f79daffected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before dd633280de7fdfd60dc4fcf63d04e2ad95b43269affected · git
    • eb36bedf28be6d986bdbcfa375bab08ffa45efd8 and later · before 452636ea5410a96e02ebaaf80b21e3620b98e0ddaffected · git
    • before 4.11not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.9-17.1.9-1

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-2026-74621Aug 22, 2026 · net/sched: act_ct: fix sk_buff leak when the header checks reject a packet
    30Monitor
  • ← EarlierCVE-2026-74622Aug 22, 2026 · net: atlantic: free RX pages of consumed but not refilled buffers
    0Monitor
  • Later →CVE-2026-74624Aug 22, 2026 · netfilter: nf_conntrack: defer invalid log until after unlock
    30Monitor

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 Linux307d80193b4a4a75b8dc4e0d3162be3755abbed7Vendor (CNA)
Linux Linux3447641d361dcc5511841d986ad4d849b2900d9bVendor (CNA)
Linux Linux452636ea5410a96e02ebaaf80b21e3620b98e0ddVendor (CNA)
Linux Linux4f1c20873f70b4b22ef86dc38dad1fda8e169bcdVendor (CNA)
Linux Linux7a3e1481f4ee6c581bccc6bfc6c970aac5be7b0cVendor (CNA)
Linux Linuxa14ceebd13bf857bfca052bc5a6bd49e737912beVendor (CNA)
Linux Linuxb13202d401e1a20fec89b0cda733dcbaf279f79dVendor (CNA)
Linux Linuxdd633280de7fdfd60dc4fcf63d04e2ad95b43269Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package 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.

No nightly-computed relations.

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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