CVE-2024-49878

Local permission-check bypass via incomplete resource traversal

Published Oct 21, 2024 · Updated May 11, 2026

Improper resource-tree traversal in Linux kernel 5.1 and affected later releases allows local users to pass an initial /dev/mem check. region_intersects() examines only top-level iomem_resource entries, misses nested System RAM created by add_memory_driver_managed(), and causes devmem_is_allowed() to authorize the range incorrectly. Reachability requires CXL memory and access to /dev/mem; ioremap() later rejects the System RAM mapping, so the demonstrated write fails without modifying memory.

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

What happened

Improper resource-tree traversal in Linux kernel 5.1 and affected later releases allows local users to pass an initial /dev/mem check. region_intersects() examines only top-level iomem_resource entries, misses nested System RAM created by add_memory_driver_managed(), and causes devmem_is_allowed() to authorize the range incorrectly. Reachability requires CXL memory and access to /dev/mem; ioremap() later rejects the System RAM mapping, so the demonstrated write fails without modifying memory.

The record

CVE
CVE-2024-49878
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.1
  2. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <06ff97a20b8c9e9d256b0d2c3e87f78f8ccea3de
  3. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <1d5f85f1b7db79c75c9e07d6571ce2a7bdf725c4
  4. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <333fbaf6864a4ca031367eb947961a1f3484d337
  5. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <393331e16ce205e036e58b3d8ca4ee2e635f21d9
  6. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <4b90d2eb451b357681063ba4552b10b39d7ad885
  7. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <8a6fef7d22a1d952aed68584d3fcc0d018d2bdc3
  8. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <927abc5b7d6d2c2e936bec5a2f71d9512c5e72f7
  9. Affected versionversion=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <b4afe4183ec77f230851ea139d91e5cf2644c68b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <06ff97a20b8c9e9d256b0d2c3e87f78f8ccea3de; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <1d5f85f1b7db79c75c9e07d6571ce2a7bdf725c4; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <333fbaf6864a4ca031367eb947961a1f3484d337; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <393331e16ce205e036e58b3d8ca4ee2e635f21d9; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <4b90d2eb451b357681063ba4552b10b39d7ad885; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <8a6fef7d22a1d952aed68584d3fcc0d018d2bdc3; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <927abc5b7d6d2c2e936bec5a2f71d9512c5e72f7; version=c221c0b0308fd01d9fb33a16f64d2fd95f8830a4 <b4afe4183ec77f230851ea139d91e5cf2644c68b

Published CVSS scores

5.5NISTCVSS: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.

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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

No sourced classifications are available.

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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