CVE-2022-50231Public exploit

Kernel disclosure or crash via short Poly1305 input

Published Jun 18, 2025 · Updated Aug 5, 2026

Out-of-bounds read in affected Linux kernels allows local users to disclose kernel memory or crash arm64 systems through AF_ALG. neon_poly1305_blocks treats a 16–31-byte input as a 32-byte initialization block, initializes s[] twice, and reads 16 bytes beyond the supplied block. Any unprivileged local process can submit the short Poly1305 input without user interaction; the read exposes adjacent memory or triggers a kernel panic.

CVSS severity7.1
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in affected Linux kernels allows local users to disclose kernel memory or crash arm64 systems through AF_ALG. neon_poly1305_blocks treats a 16–31-byte input as a 32-byte initialization block, initializes s[] twice, and reads 16 bytes beyond the supplied block. Any unprivileged local process can submit the short Poly1305 input without user interaction; the read exposes adjacent memory or triggers a kernel panic.

The record

CVE
CVE-2022-50231
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.5
  2. Affected versionversion=f569ca16475155013525686d0f73bc379c67e635 <3c77292d52b341831cb09c24ca4112a1e4f9e91f
  3. Affected versionversion=f569ca16475155013525686d0f73bc379c67e635 <3d4c28475ee352c440b83484b72b1320ff76364a
  4. Affected versionversion=f569ca16475155013525686d0f73bc379c67e635 <7ae19d422c7da84b5f13bc08b98bd737a08d3a53
  5. Affected versionversion=f569ca16475155013525686d0f73bc379c67e635 <8d25a08599df7ca3093eb7ca731c7cd41cbfbb51
  6. Affected versionversion=f569ca16475155013525686d0f73bc379c67e635 <d069dcffef849b8fd10030fd73007a79612803e6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=f569ca16475155013525686d0f73bc379c67e635 <3c77292d52b341831cb09c24ca4112a1e4f9e91f; version=f569ca16475155013525686d0f73bc379c67e635 <3d4c28475ee352c440b83484b72b1320ff76364a; version=f569ca16475155013525686d0f73bc379c67e635 <7ae19d422c7da84b5f13bc08b98bd737a08d3a53; version=f569ca16475155013525686d0f73bc379c67e635 <8d25a08599df7ca3093eb7ca731c7cd41cbfbb51; version=f569ca16475155013525686d0f73bc379c67e635 <d069dcffef849b8fd10030fd73007a79612803e6

Published CVSS scores

7.1Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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