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NVD / CVE Program· CNA Linux

CVE-2026-46015: tcp: call sk_data_ready() after listener migration

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 12625b4da84caf4d84a04988710a7b9bcf702b18, 14e9bb6eba8f59dcc637702e4744ae5e30660d76, 3864c6ba1e041bc75342353a70fa2a2c6f909923; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 12625b4da84caf4d84a04988710a7b9bcf702b18, 14e9bb6eba8f59dcc637702e4744ae5e30660d76, 3864c6ba1e041bc75342353a70fa2a2c6f909923; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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: tcp: call sk_data_ready() after listener migration When inet_csk_listen_stop() migrates an established child socket from a closing listener to another socket in the same SO_REUSEPORT group, the target listener gets a new accept-queue entry via inet_csk_reqsk_queue_add(), but that path never notifies the target listener's waiters. A nonblocking accept() still works because it checks the queue directly, but poll()/epoll_wait() waiters and blocking accept() callers can also remain asleep indefinitely. Call READ_ONCE(nsk->sk_data_ready)(nsk) after a successful migration in inet_csk_listen_stop(). However, after inet_csk_reqsk_queue_add() succeeds, the ref acquired in reuseport_migrate_sock() is effectively transferred to nreq->rsk_listener. Another CPU can then dequeue nreq via accept() or listener shutdown, hit reqsk_put(), and drop that listener ref. Since listeners are SOCK_RCU_FREE, wrap the post-queue_add() dereferences of nsk in rcu_read_lock()/rcu_read_unlock(), which also covers the existing sock_net(nsk) access in that path. The reqsk_timer_handler() path does not need the same changes for two reasons: half-open requests become readable only after the final ACK, where tcp_child_process() already wakes the listener; and once nreq is visible via inet_ehash_insert(), the success path no longer touches nsk directly.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th 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
  • 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.14 and later · before 5.15.209
  • linux linux kernel5.16 and later · before 6.1.175
  • linux linux kernel6.2 and later · before 6.6.140
  • linux linux kernel6.7 and later · before 6.12.86
  • linux linux kernel6.13 and later · before 6.18.27
  • linux linux kernel6.19 and later · before 7.0.4

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

    • 5.14affected
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before 7aa7933a5607b1e5b56f322d17265c1d0ea02c51affected · git
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before 14e9bb6eba8f59dcc637702e4744ae5e30660d76affected · git
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before ab5fdcd535645f6dbe6e9e21d96a08d141e88b4baffected · git
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before bebd058ef40c67a81fe6d9ee8beaa4ede90e0704affected · git
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before 83bb57635d7cbafde32f865b577ecfd969f02337affected · git
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before 12625b4da84caf4d84a04988710a7b9bcf702b18affected · git
    • 54b92e84193749c9968aff2dd46e3b0f42643e18 and later · before 3864c6ba1e041bc75342353a70fa2a2c6f909923affected · git
    • before 5.14not affected · semver
    • 5.15.209 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9kernelbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64kbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debugbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-develbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-cross-headersbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-debugbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-debug-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-debug-develbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8
AlmaLinux:9kernel-debug-modules-corebefore 5.14.0-687.46.1.el9_85.14.0-687.46.1.el9_8

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-46008May 27, 2026 · mm/damon/core: fix damos_walk() vs kdamond_fn() exit race
    18Monitor
  • ← EarlierCVE-2026-46014May 27, 2026 · KVM: SVM: Add missing save/restore handling of LBR MSRs
    22Monitor
  • Later →CVE-2026-46018May 27, 2026 · ALSA: usb-audio: stop parsing UAC2 rates at MAX_NR_RATES
    22Monitor

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 Linux12625b4da84caf4d84a04988710a7b9bcf702b18Vendor (CNA)
Linux Linux14e9bb6eba8f59dcc637702e4744ae5e30660d76Vendor (CNA)
Linux Linux3864c6ba1e041bc75342353a70fa2a2c6f909923Vendor (CNA)
Linux Linux7aa7933a5607b1e5b56f322d17265c1d0ea02c51Vendor (CNA)
Linux Linux83bb57635d7cbafde32f865b577ecfd969f02337Vendor (CNA)
Linux Linuxab5fdcd535645f6dbe6e9e21d96a08d141e88b4bVendor (CNA)
Linux Linuxbebd058ef40c67a81fe6d9ee8beaa4ede90e0704Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.46.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.52.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+4

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

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-408 · Incorrect Behavior Order: Early Amplification

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.

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 (9 more)

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

All records