CVE-2024-46780

Kernel memory disclosure via unlocked sysfs reads

Published Sep 18, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel nilfs2 before 6.11 allows local users to read kernel memory and crash the system through sysfs. Attribute show methods dereference replaceable ns_sbp superblock buffers without holding nilfs->ns_sem, allowing reads after a buffer is released or swapped. Exploitation requires an active nilfs2 mount and repeated local reads timed against superblock replacement; disclosed data and system interruption are the bounded consequences.

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

Use-after-free in Linux kernel nilfs2 before 6.11 allows local users to read kernel memory and crash the system through sysfs. Attribute show methods dereference replaceable ns_sbp superblock buffers without holding nilfs->ns_sem, allowing reads after a buffer is released or swapped. Exploitation requires an active nilfs2 mount and repeated local reads timed against superblock replacement; disclosed data and system interruption are the bounded consequences.

The record

CVE
CVE-2024-46780
Published
Sep 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 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

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=3.17
  2. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <157c0d94b4c40887329418c70ef4edd1a8d6b4ed
  3. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <19cfeba0e4b8eda51484fcf8cf7d150418e1d880
  4. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <683408258917541bdb294cd717c210a04381931e
  5. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <8c6e43b3d5f109cf9c61bc188fcc8175404e924f
  6. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <962562d4c70c5cdeb4e955d63ff2017c4eca1aad
  7. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <b14e7260bb691d7f563f61da07d61e3c8b59a614
  8. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <b90beafac05931cbfcb6b1bd4f67c1923f47040e
  9. Affected versionversion=da7141fb78db915680616e15677539fc8140cf53 <ba97ba173f9625d5f34a986088979eae8b80d38e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.17; version=da7141fb78db915680616e15677539fc8140cf53 <157c0d94b4c40887329418c70ef4edd1a8d6b4ed; version=da7141fb78db915680616e15677539fc8140cf53 <19cfeba0e4b8eda51484fcf8cf7d150418e1d880; version=da7141fb78db915680616e15677539fc8140cf53 <683408258917541bdb294cd717c210a04381931e; version=da7141fb78db915680616e15677539fc8140cf53 <8c6e43b3d5f109cf9c61bc188fcc8175404e924f; version=da7141fb78db915680616e15677539fc8140cf53 <962562d4c70c5cdeb4e955d63ff2017c4eca1aad; version=da7141fb78db915680616e15677539fc8140cf53 <b14e7260bb691d7f563f61da07d61e3c8b59a614; version=da7141fb78db915680616e15677539fc8140cf53 <b90beafac05931cbfcb6b1bd4f67c1923f47040e; version=da7141fb78db915680616e15677539fc8140cf53 <ba97ba173f9625d5f34a986088979eae8b80d38e

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CVE TeamCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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Your stack

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