CVE-2026-45998

Kernel oops via post-failure RxRPC buffer trace

Published May 27, 2026 · Updated May 27, 2026

Use-after-free in the Linux Kernel RxRPC receive path allows local users to trigger a kernel oops while DATA packets are processed. When skb_unshare() fails in rxrpc_input_packet(), it frees the socket buffer and clears the parent pointer before rxrpc_io_thread() passes that pointer to trace_rxrpc_rx_done(). Reachability requires a packet-unsharing allocation failure; the published direct consequence is an oops rather than an independently demonstrated kernel-wide crash.

CVSS severity7.8
High
EPSS probability0.13%
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 RxRPC receive path allows local users to trigger a kernel oops while DATA packets are processed. When skb_unshare() fails in rxrpc_input_packet(), it frees the socket buffer and clears the parent pointer before rxrpc_io_thread() passes that pointer to trace_rxrpc_rx_done(). Reachability requires a packet-unsharing allocation failure; the published direct consequence is an oops rather than an independently demonstrated kernel-wide crash.

The record

CVE
CVE-2026-45998
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-825, CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <1f2740150f904bfa60e4bad74d65add3ccb5e7f8
  2. Affected versionversion=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <8fde6296c4d4da2be7ab761305ab7f232b94eefd
  3. Affected versionversion=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <996b0487b3cdda4c91811dbb1c9564626bc840bd
  4. Affected versionversion=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <bf20f46d94f1db38e6ffc0ca204a5fe0de01b495
  5. Affected versionversion=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <e3bf143b1e98fb3d6d9e6825bcd683974d478e8c
  6. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <1f2740150f904bfa60e4bad74d65add3ccb5e7f8; version=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <8fde6296c4d4da2be7ab761305ab7f232b94eefd; version=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <996b0487b3cdda4c91811dbb1c9564626bc840bd; version=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <bf20f46d94f1db38e6ffc0ca204a5fe0de01b495; version=2d1faf7a0ca3c0b327cf064c80e4e775532c9319 <e3bf143b1e98fb3d6d9e6825bcd683974d478e8c; version=6.2

Published CVSS scores

7.8NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS: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

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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-825Expired Pointer Dereference
CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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