CVE-2026-43463

System crash via unchecked RxRPC error pointer

Published May 8, 2026 · Updated May 8, 2026

Invalid pointer dereference in Linux Kernel 6.7.3, 6.8 through 6.18.18, and 6.19 through 6.19.8 allows local users to crash the system. AFS callers treat an ERR_PTR from rxrpc_kernel_lookup_peer() after peer-allocation failure as a valid peer because they test only for NULL. Reaching the fault requires AFS/RxRPC activity and a peer-allocation failure; the impact is a system crash without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid pointer dereference in Linux Kernel 6.7.3, 6.8 through 6.18.18, and 6.19 through 6.19.8 allows local users to crash the system. AFS callers treat an ERR_PTR from rxrpc_kernel_lookup_peer() after peer-allocation failure as a valid peer because they test only for NULL. Reaching the fault requires AFS/RxRPC activity and a peer-allocation failure; the impact is a system crash without reported data disclosure or modification.

The record

CVE
CVE-2026-43463
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=056fc740be000d39a7dba700a935f3bbfbc664e6
  2. Affected versionversion=6.8
  3. Affected versionversion=72904d7b9bfbf2dd146254edea93958bc35bbbfe <4245a79003adf30e67f8e9060915bd05cb31d142
  4. Affected versionversion=72904d7b9bfbf2dd146254edea93958bc35bbbfe <54331c5dcc6d97683d7ca2788e7ef9c9505e1477
  5. Affected versionversion=72904d7b9bfbf2dd146254edea93958bc35bbbfe <d55fa7cd4b19ba91b34b307d769c149e56ad0a75

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=056fc740be000d39a7dba700a935f3bbfbc664e6; version=6.8; version=72904d7b9bfbf2dd146254edea93958bc35bbbfe <4245a79003adf30e67f8e9060915bd05cb31d142; version=72904d7b9bfbf2dd146254edea93958bc35bbbfe <54331c5dcc6d97683d7ca2788e7ef9c9505e1477; version=72904d7b9bfbf2dd146254edea93958bc35bbbfe <d55fa7cd4b19ba91b34b307d769c149e56ad0a75

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.9SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2SUSECVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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