CVE-2023-53265

Kernel memory disclosure and crash via VID offset

Published Sep 16, 2025 · Updated Sep 16, 2025

Out-of-bounds read in Linux UBI before 6.3-rc1 allows local users to disclose kernel memory or crash the system during UBI attachment. ubi_alloc_vid_buf allocates a VID-header buffer that is too small when vid_hdr_offset exceeds the expected bounds, and ubi_io_write_vid_hdr then computes a CRC beyond the allocation. Reachability requires local access to the UBI control ioctl and an MTD attachment configuration; the demonstrated fault reads four bytes beyond a slab allocation.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux UBI before 6.3-rc1 allows local users to disclose kernel memory or crash the system during UBI attachment. ubi_alloc_vid_buf allocates a VID-header buffer that is too small when vid_hdr_offset exceeds the expected bounds, and ubi_io_write_vid_hdr then computes a CRC beyond the allocation. Reachability requires local access to the UBI control ioctl and an MTD attachment configuration; the demonstrated fault reads four bytes beyond a slab allocation.

The record

CVE
CVE-2023-53265
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record 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=2.6.22
  2. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <1b42b1a36fc946f0d7088425b90d491b4257ca3e
  3. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <61aeba0e4b4124cfe3c5427feaf29c626dfa89e5
  4. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <61e04db3bec87f7dd10074296deb7d083e2ccade
  5. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <701bb3ed5a88a73ebbe1266895bdeff065226dca
  6. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <771e207a839a29ba943e89f473b0fecd16089e2e
  7. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <846bfba34175c23b13cc2023c2d67b96e8c14c43
  8. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <e1b73fe4f4c6bb80755eb4bf4b867a8fd8b1a7fe
  9. Affected versionversion=801c135ce73d5df1caf3eca35b66a10824ae0707 <f7adb740f97b6fa84e658892dcb08e37a31a4e77

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.22; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <1b42b1a36fc946f0d7088425b90d491b4257ca3e; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <61aeba0e4b4124cfe3c5427feaf29c626dfa89e5; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <61e04db3bec87f7dd10074296deb7d083e2ccade; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <701bb3ed5a88a73ebbe1266895bdeff065226dca; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <771e207a839a29ba943e89f473b0fecd16089e2e; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <846bfba34175c23b13cc2023c2d67b96e8c14c43; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <e1b73fe4f4c6bb80755eb4bf4b867a8fd8b1a7fe; version=801c135ce73d5df1caf3eca35b66a10824ae0707 <f7adb740f97b6fa84e658892dcb08e37a31a4e77

Published CVSS scores

7.1CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

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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