CVE-2026-43050Public exploit

Kernel crash via unsynchronized LEC socket teardown

Published May 1, 2026 · Updated May 1, 2026

Use-after-free in the Linux Kernel ATM LANE subsystem allows local users to crash the kernel through concurrent LEC socket teardown. lec_atm_close() clears priv->lecd without synchronization while send_to_lecd(), lec_handle_bridge(), and lec_atm_send() dereference the pointer, allowing sock_def_readable() to access a freed socket wait queue. Triggering the race requires low-privileged local access and concurrent teardown of an ATM LANE client socket; the demonstrated consequence is a kernel memory-safety fault and crash.

CVSS severity7.0
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel ATM LANE subsystem allows local users to crash the kernel through concurrent LEC socket teardown. lec_atm_close() clears priv->lecd without synchronization while send_to_lecd(), lec_handle_bridge(), and lec_atm_send() dereference the pointer, allowing sock_def_readable() to access a freed socket wait queue. Triggering the race requires low-privileged local access and concurrent teardown of an ATM LANE client socket; the demonstrated consequence is a kernel memory-safety fault and crash.

The record

CVE
CVE-2026-43050
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <317843d5355062020649124eb4a0d7acbcc3f53e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3989740fa4978e1d2d51ecc62be1b01093e104ad
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e8b25f32f2f35549d03d77da030a24a45bdef5b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fbbb1ff936d7ff9528d929c1549977e8123d8a8
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <750a33f417f3d196b86375f8d9f8938bacf130fe
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <922814879542c2e397b0e9641fd36b8202a8e555
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abc10f85a3965ac14b9ed7ad3e67b35604a63aa3
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b256d055da47258e63f8b40965f276c5f23d229a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <317843d5355062020649124eb4a0d7acbcc3f53e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3989740fa4978e1d2d51ecc62be1b01093e104ad; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e8b25f32f2f35549d03d77da030a24a45bdef5b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5fbbb1ff936d7ff9528d929c1549977e8123d8a8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <750a33f417f3d196b86375f8d9f8938bacf130fe; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <922814879542c2e397b0e9641fd36b8202a8e555; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abc10f85a3965ac14b9ed7ad3e67b35604a63aa3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b256d055da47258e63f8b40965f276c5f23d229a

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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