Linux Kernel: Concurrent Execution using Shared Resource with Improper Synchronization
CVE-2022-29582 is a high-severity concurrent execution using shared resource with improper synchronization vulnerability in Linux Kernel from Linux, with a CVSS 3.1 base score of 7.0 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 5.10.111, 5.15.34, 5.16.20 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 0.77% chance of exploitation within 30 days, higher than 56% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux Kernel to 5.10.111 or 5.15.34 or 5.16.20 or 5.17.3, whichever matches your release line, or a later version.
- Read the advisory on cdn.kernel.org for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux Kernel | before 5.10.111; 5.11 up to, but not including, 5.15.34; 5.16 up to, but not including, 5.16.20; 5.17 up to, but not including, 5.17.3 | 5.10.111, 5.15.34, 5.16.20, 5.17.3 |
| Debian | Debian Linux | 11.0 | 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
- HighSuccess depends on conditions outside the attacker's control.
- 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:H/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.0 | High | NVD |
| CVSS 2.0 | 6.9 | Medium | NVD |
Official description
In the Linux kernel before 5.17.3, fs/io_uring.c has a use-after-free due to a race condition in io_uring timeouts. This can be triggered by a local user who has no access to any user namespace; however, the race condition perhaps can only be exploited infrequently.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Concurrent Execution using Shared Resource with Improper Synchronization
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
How developers prevent this class of flaw
- In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
- Use thread-safe capabilities such as the data access abstraction in Spring.
- Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring. Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Patches and release notes
- openwall.com/lists/oss-security/2024/04/24/3Mailing List, Third Party Advisory
- github.com/torvalds/linux/commit/e677edbcabee849bfdd43f1602bccbecf736a646Third Party Advisory
Third-party and government advisories
- openwall.com/lists/oss-security/2022/04/22/4Mailing List, Third Party Advisory
- openwall.com/lists/oss-security/2022/08/08/3Mailing List, Third Party Advisory
- github.com/Ruia-ruia/CVE-2022-29582-ExploitThird Party Advisory
- debian.org/security/2022/dsa-5127Third Party Advisory
- openwall.com/lists/oss-security/2022/04/22/3Mailing List, Third Party Advisory
Technical write-ups (may include proof of concept)
- ruia-ruia.github.io/2022/08/05/CVE-2022-29582-io-uring/Exploit, 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 Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities
- 7.0 High severity
- 4.4 Medium severity
- 7.0 High severity
- 7.4 High severity
- 7.0 High severity
- 7.0 High severity
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