CVE-2024-56704

IRQ double-free via mismatched device identifier

Published Dec 28, 2024 · Updated Aug 5, 2026

Improper IRQ release in the Linux 9p/Xen transport allows local users to trigger a double-free during affected-kernel device teardown. xen_9pfs_front_free passed the Xen device pointer to unbind_from_irqhandler instead of the ring pointer used when binding the IRQ. The path is limited to Xen guests and requires CAP_SYS_ADMIN; public sources report the double-free warning but no reliable crash or code-execution outcome.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IRQ release in the Linux 9p/Xen transport allows local users to trigger a double-free during affected-kernel device teardown. xen_9pfs_front_free passed the Xen device pointer to unbind_from_irqhandler instead of the ring pointer used when binding the IRQ. The path is limited to Xen guests and requires CAP_SYS_ADMIN; public sources report the double-free warning but no reliable crash or code-execution outcome.

The record

CVE
CVE-2024-56704
Published
Dec 28, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 28, 2024CVE 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=4.12
  2. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <2bb3ee1bf237557daea1d58007d2e1d4a6502ccf
  3. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <4950408793b118cb8075bcee1f033b543fb719fa
  4. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <530bc9f03a102fac95b07cda513bfc16ff69e0ee
  5. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <692eb06703afc3e24d889d77e94a0e20229f6a4a
  6. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <7f5a2ed5c1810661e6b03f5a4ebf17682cdea850
  7. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <b9e26059664bd9ebc64a0e8f5216266fc9f84265
  8. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <d74b4b297097bd361b8a9abfde9b521ff464ea9c
  9. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <d888f5f5d76b2722c267e6bdf51d445d60647b7b
  10. Affected versionversion=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <e43c608f40c065b30964f0a806348062991b802d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.12; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <2bb3ee1bf237557daea1d58007d2e1d4a6502ccf; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <4950408793b118cb8075bcee1f033b543fb719fa; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <530bc9f03a102fac95b07cda513bfc16ff69e0ee; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <692eb06703afc3e24d889d77e94a0e20229f6a4a; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <7f5a2ed5c1810661e6b03f5a4ebf17682cdea850; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <b9e26059664bd9ebc64a0e8f5216266fc9f84265; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <d74b4b297097bd361b8a9abfde9b521ff464ea9c; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <d888f5f5d76b2722c267e6bdf51d445d60647b7b; version=71ebd71921e451f0f942ddfe85d01e31ddc6eb88 <e43c608f40c065b30964f0a806348062991b802d

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free

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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