CVE-2024-56690

Local system panic via propagated pcrypt EAGAIN

Published Dec 28, 2024 · Updated May 23, 2026

Denial of service in Linux kernel pcrypt allows local users to panic the system during CPU hotplug when panic_on_warn is enabled. When padata_do_parallel() returns -EBUSY, pcrypt_aead_encrypt() and pcrypt_aead_decrypt() propagate -EAGAIN to alg_test(), which emits a WARN rather than retrying the crypto operation directly. Exploitation requires local low-privileged access, a CPU online or offline transition, use of pcrypt AEAD operations, and panic_on_warn=1; the bounded consequence is a kernel panic and system interruption.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Linux kernel pcrypt allows local users to panic the system during CPU hotplug when panic_on_warn is enabled. When padata_do_parallel() returns -EBUSY, pcrypt_aead_encrypt() and pcrypt_aead_decrypt() propagate -EAGAIN to alg_test(), which emits a WARN rather than retrying the crypto operation directly. Exploitation requires local low-privileged access, a CPU online or offline transition, use of pcrypt AEAD operations, and panic_on_warn=1; the bounded consequence is a kernel panic and system interruption.

The record

CVE
CVE-2024-56690
Published
Dec 28, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=039fec48e062504f14845124a1a25eb199b2ddc0 <dd8bf8eb5beba1e7c3b11a9a5a58ccbf345a69e6
  2. Affected versionversion=372636debe852913529b1716f44addd94fff2d28 <5edae7a9a35606017ee6e05911c290acee9fee5a
  3. Affected versionversion=4.14.331 <4.15
  4. Affected versionversion=4.19.300 <4.19.325
  5. Affected versionversion=5.10.202 <5.10.231
  6. Affected versionversion=5.15.140 <5.15.174
  7. Affected versionversion=5.4.262 <5.4.287
  8. Affected versionversion=546c1796ad1ed0d87dab3c4b5156d75819be2316 <96001f52ae8c70e2c736d3e1e5dc53d5b521e5ca
  9. Affected versionversion=6.1.64 <6.1.120
  10. Affected versionversion=6.5.13 <6.6
  11. Affected versionversion=6.6.3 <6.6.64
  12. Affected versionversion=6.7
  13. Affected versionversion=8f4f68e788c3a7a696546291258bfa5fdb215523 <662f2f13e66d3883b9238b0b96b17886179e60e2
  14. Affected versionversion=8f4f68e788c3a7a696546291258bfa5fdb215523 <7ddab756f2de5b7b43c122ebebdf37f400fb2b6f
  15. Affected versionversion=8f4f68e788c3a7a696546291258bfa5fdb215523 <a8e0074ffb38c9a5964a221bb998034d016c93a2
  16. Affected versionversion=c55fc098fd9d2dca475b82d00ffbcaf97879d77e <92834692a539b5b7f409e467a14667d64713b732
  17. Affected versionversion=c9c1334697301c10e6918d747ed38abfbc0c96e7 <fca8aed12218f96b38e374ff264d78ea1fbd23cc
  18. Affected versionversion=e134f3aba98e6c801a693f540912c2d493718ddf
  19. Affected versionversion=e97bf4ada7dddacd184c3e196bd063b0dc71b41d <a92ccd3618e42333ac6f150ecdac14dca298bc7a
  20. Affected versionversion=fb2d3a50a8f29a3c66682bb426144f40e32ab818

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=039fec48e062504f14845124a1a25eb199b2ddc0 <dd8bf8eb5beba1e7c3b11a9a5a58ccbf345a69e6; version=372636debe852913529b1716f44addd94fff2d28 <5edae7a9a35606017ee6e05911c290acee9fee5a; version=4.14.331 <4.15; version=4.19.300 <4.19.325; version=5.10.202 <5.10.231; version=5.15.140 <5.15.174; version=5.4.262 <5.4.287; version=546c1796ad1ed0d87dab3c4b5156d75819be2316 <96001f52ae8c70e2c736d3e1e5dc53d5b521e5ca; version=6.1.64 <6.1.120; version=6.5.13 <6.6; version=6.6.3 <6.6.64; version=6.7; version=8f4f68e788c3a7a696546291258bfa5fdb215523 <662f2f13e66d3883b9238b0b96b17886179e60e2; version=8f4f68e788c3a7a696546291258bfa5fdb215523 <7ddab756f2de5b7b43c122ebebdf37f400fb2b6f; version=8f4f68e788c3a7a696546291258bfa5fdb215523 <a8e0074ffb38c9a5964a221bb998034d016c93a2; version=c55fc098fd9d2dca475b82d00ffbcaf97879d77e <92834692a539b5b7f409e467a14667d64713b732; version=c9c1334697301c10e6918d747ed38abfbc0c96e7 <fca8aed12218f96b38e374ff264d78ea1fbd23cc; version=e134f3aba98e6c801a693f540912c2d493718ddf; version=e97bf4ada7dddacd184c3e196bd063b0dc71b41d <a92ccd3618e42333ac6f150ecdac14dca298bc7a; version=fb2d3a50a8f29a3c66682bb426144f40e32ab818

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo