CyberSecBulletin
CVE-2025-71075NVD status: Modified

Linux: Use After Free

Published Updated By the CyberSecBulletin desk

CVE-2025-71075 is a high-severity use after free vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 c8f6f88cd1df35155258285c4f43268b361819df, 278455a82245a572aeb218a6212a416a98e418de, b3e655e52b98a1d3df41c8e42035711e083099f8 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 0.15% 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 c8f6f88cd1df35155258285c4f43268b361819df or 278455a82245a572aeb218a6212a416a98e418de or b3e655e52b98a1d3df41c8e42035711e083099f8 or e354793a7ab9bb0934ea699a9d57bcd1b48fc27b, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.248 or 5.15.198 or 6.1.160 or 6.6.120, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, c8f6f88cd1df35155258285c4f43268b361819df; 2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, 278455a82245a572aeb218a6212a416a98e418de; 2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, b3e655e52b98a1d3df41c8e42035711e083099f8; 2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, e354793a7ab9bb0934ea699a9d57bcd1b48fc27b; 2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, a41dc180b6e1229ae49ca290ae14d82101c148c3; 2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, 751c19635c2bfaaf2836a533caa3663633066dcf; 2908d778ab3e244900c310974e1fc1c69066e450 up to, but not including, f6ab594672d4cba08540919a4e6be2e202b60007; 2.6.19c8f6f88cd1df35155258285c4f43268b361819df, 278455a82245a572aeb218a6212a416a98e418de, b3e655e52b98a1d3df41c8e42035711e083099f8, e354793a7ab9bb0934ea699a9d57bcd1b48fc27b, a41dc180b6e1229ae49ca290ae14d82101c148c3, 751c19635c2bfaaf2836a533caa3663633066dcf
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)V3.1.6 and later; V3.1.7 and laterNot stated
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)V3.1.6 and later; V3.1.7 and laterNot stated
LinuxLinux Kernel2.6.19.1 up to, but not including, 5.10.248; 5.11 up to, but not including, 5.15.198; 5.16 up to, but not including, 6.1.160; 6.2 up to, but not including, 6.6.120; 6.7 up to, but not including, 6.12.64; 6.13 up to, but not including, 6.18.3; 2.6.19; 6.195.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3

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
HighData or code can be modified at will.
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:H/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: scsi: aic94xx: fix use-after-free in device removal path The asd_pci_remove() function fails to synchronize with pending tasklets before freeing the asd_ha structure, leading to a potential use-after-free vulnerability. When a device removal is triggered (via hot-unplug or module unload), race condition can occur. The fix adds tasklet_kill() before freeing the asd_ha structure, ensuring all scheduled tasklets complete before cleanup proceeds.

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

The underlying weakness: Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

How developers prevent this class of flaw

  • Choose a language that provides automatic memory management.
  • When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.

More Use After Free vulnerabilities (CWE-416)

Timeline

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

References

Recent Use After Free vulnerabilities

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