Linux Kernel: Improper Privilege Management
CVE-2022-25636 is a high-severity improper privilege management vulnerability in Linux Kernel from 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 5.4.182, 5.10.103, 5.15.26 as the first without the flaw, so updating Linux Kernel to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.63% chance of exploitation within 30 days, higher than 86% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux Kernel to 5.4.182 or 5.10.103 or 5.15.26 or 5.16.12, whichever matches your release line, or a later version.
- Read the advisory on git.kernel.org for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux Kernel | 5.4 up to, but not including, 5.4.182; 5.5 up to, but not including, 5.10.103; 5.11 up to, but not including, 5.15.26; 5.16 up to, but not including, 5.16.12 | 5.4.182, 5.10.103, 5.15.26, 5.16.12 |
| Debian | Debian Linux | 11.0 | Not stated |
| NetApp | H300e | Not specified in the record | Not stated |
| NetApp | H300s | Not specified in the record | Not stated |
| NetApp | H410c | Not specified in the record | Not stated |
| NetApp | H410s | Not specified in the record | Not stated |
| NetApp | H500e | Not specified in the record | Not stated |
| NetApp | H500s | Not specified in the record | Not stated |
| NetApp | H700e | Not specified in the record | Not stated |
| NetApp | H700s | Not specified in the record | Not stated |
| Oracle | Communications Cloud Native Core Binding Support Function | 22.1.3 | Not stated |
| Oracle | Communications Cloud Native Core Network Exposure Function | 22.1.1 | Not stated |
| Oracle | Communications Cloud Native Core Policy | 22.2.0 | Not stated |
Version data comes from NVD's product matching. 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.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | NVD |
| CVSS 2.0 | 6.9 | Medium | NVD |
Official description
net/netfilter/nf_dup_netdev.c in the Linux kernel 5.4 through 5.6.10 allows local users to gain privileges because of a heap out-of-bounds write. This is related to nf_tables_offload.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Privilege Management
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
How developers prevent this class of flaw
- Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Consider following the principle of separation of privilege. Require multiple conditions to be met before permitting access to a system resource.
More Improper Privilege Management vulnerabilities (CWE-269)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- openwall.com/lists/oss-security/2022/02/22/1Mailing List, Third Party Advisory
- oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
Third-party and government advisories
- packetstormsecurity.com/files/166444/Kernel-Live-Patch-Security-Notice-LSN-0085-1.htmlThird Party Advisory, VDB Entry
- security.netapp.com/advisory/ntap-20220325-0002/Third Party Advisory
- debian.org/security/2022/dsa-5095Third Party Advisory
Technical write-ups (may include proof of concept)
- github.com/Bonfee/CVE-2022-25636Exploit, Third Party Advisory
- nickgregory.me/linux/security/2022/03/12/cve-2022-25636/Exploit, Third Party Advisory
- openwall.com/lists/oss-security/2022/02/21/2Exploit, Mailing List, Third Party Advisory
Other vulnerabilities in Linux Kernel
- 9.8 Critical severity
- 7.0 High severity
- 7.8 High severity
- 7.1 High severity
- 7.0 High severity
- 7.8 High severity
Recent Improper Privilege Management vulnerabilities
- 7.2 High severity
- 9.8 Critical severity
- 8.8 High severity
- 8.8 High severity
- 9.8 Critical severity
- 7.1 High severity
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