CVE-2024-57883

Kernel compromise via conflated PMD reference counts

Published Jan 15, 2025 · Updated Aug 5, 2026

Use-after-free in affected Linux kernel releases allows local users to read and write kernel memory through crafted HugeTLB mappings. The huge_pmd_unshare path treats the folio reference count as the PMD sharing count, so transient try_get_folio pins misclassify a private table and leave live mappings tied to freed or leaked pages. An unprivileged local user needs provisioned, accessible huge pages and can race mapping changes against repeated GUP-fast operations; success grants physical-memory access, kernel control-flow compromise, resource exhaustion, or a crash.

CVSS severity7.8
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

Use-after-free in affected Linux kernel releases allows local users to read and write kernel memory through crafted HugeTLB mappings. The huge_pmd_unshare path treats the folio reference count as the PMD sharing count, so transient try_get_folio pins misclassify a private table and leave live mappings tied to freed or leaked pages. An unprivileged local user needs provisioned, accessible huge pages and can race mapping changes against repeated GUP-fast operations; success grants physical-memory access, kernel control-flow compromise, resource exhaustion, or a crash.

The record

CVE
CVE-2024-57883
Published
Jan 15, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 15, 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

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=2.6.20
  2. Affected versionversion=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <02333ac1c35370517a19a4a131332a9690c6a5c7
  3. Affected versionversion=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <2e31443a0d18ae43b9d29e02bf0563f07772193d
  4. Affected versionversion=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <56b274473d6e7e7375f2d0a2b4aca11d67c6b52f
  5. Affected versionversion=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <59d9094df3d79443937add8700b2ef1a866b1081
  6. Affected versionversion=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <8410996eb6fea116fe1483ed977aacf580eee7b4
  7. Affected versionversion=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.20; version=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <02333ac1c35370517a19a4a131332a9690c6a5c7; version=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <2e31443a0d18ae43b9d29e02bf0563f07772193d; version=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <56b274473d6e7e7375f2d0a2b4aca11d67c6b52f; version=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <59d9094df3d79443937add8700b2ef1a866b1081; version=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <8410996eb6fea116fe1483ed977aacf580eee7b4; version=39dde65c9940c97fcd178a3d2b1c57ed8b7b68aa <94b4b41d0cdf5cfd4d4325bc0e6e9e0d0e996133

Published CVSS scores

7.8Linux kernel CNACVSS: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

T1068Exploitation for Privilege Escalation

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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