CyberSecBulletin
CVE-2025-39760NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2025-39760 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 5c3097ede7835d3caf6543eb70ff689af4550cd2, 058ad2b722812708fe90567875704ae36563e33b, b10e0f868067c6f25bbfabdcf3e1e6432c24ca55 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.19% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 5c3097ede7835d3caf6543eb70ff689af4550cd2 or 058ad2b722812708fe90567875704ae36563e33b or b10e0f868067c6f25bbfabdcf3e1e6432c24ca55 or 5badd56c711e2c8371d1670f9bd486697575423c, whichever matches your release line, or a later version.
  2. Update SIMATIC CN 4100 to V5.0 or a later version.
  3. Update Linux Kernel to 5.10.241 or 5.15.190 or 6.1.149 or 6.6.103, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, 5c3097ede7835d3caf6543eb70ff689af4550cd2; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, 058ad2b722812708fe90567875704ae36563e33b; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, b10e0f868067c6f25bbfabdcf3e1e6432c24ca55; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, 5badd56c711e2c8371d1670f9bd486697575423c; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, 9512510cee7d1becdb0e9413fdd3ab783e4e30ee; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, 4fe6f472f0beef4281e6f03bc38a910a33be663f; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, 9843bcb187cb933861f7805022e6873905f669e4; 842f16905dfc6743c1dd80c3d29b49ba3ab7f7c8 up to, but not including, cf16f408364efd8a68f39011a3b073c83a03612d; and 1 more ranges5c3097ede7835d3caf6543eb70ff689af4550cd2, 058ad2b722812708fe90567875704ae36563e33b, b10e0f868067c6f25bbfabdcf3e1e6432c24ca55, 5badd56c711e2c8371d1670f9bd486697575423c, 9512510cee7d1becdb0e9413fdd3ab783e4e30ee, 4fe6f472f0beef4281e6f03bc38a910a33be663f
SiemensSIMATIC CN 4100before V5.0V5.0
LinuxLinux Kernel2.6.35 up to, but not including, 5.10.241; 5.11 up to, but not including, 5.15.190; 5.16 up to, but not including, 6.1.149; 6.2 up to, but not including, 6.6.103; 6.7 up to, but not including, 6.12.43; 6.13 up to, but not including, 6.15.11; 6.16 up to, but not including, 6.16.25.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.43, 6.15.11
DebianDebian Linux11.0Not stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: usb: core: config: Prevent OOB read in SS endpoint companion parsing usb_parse_ss_endpoint_companion() checks descriptor type before length, enabling a potentially odd read outside of the buffer size. Fix this up by checking the size first before looking at any of the fields in the descriptor.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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