CVE-2024-35831: io_uring: Fix release of pinned pages when __io_uaddr_map fails
First published: Fri May 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: io_uring: Fix release of pinned pages when __io_uaddr_map fails Looking at the error path of __io_uaddr_map, if we fail after pinning the pages for any reasons, ret will be set to -EINVAL and the error handler won't properly release the pinned pages. I didn't manage to trigger it without forcing a failure, but it can happen in real life when memory is heavily fragmented.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.6.23 | 6.6.23 |
| redhat/kernel | <6.7.11 | 6.7.11 |
| redhat/kernel | <6.8.2 | 6.8.2 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.25-1 6.12.27-1 |
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Reference Links
- https://git.kernel.org/stable/c/0b6f39c175ba5f0ef72bdb3b9d2a06ad78621d62
- https://git.kernel.org/stable/c/4d376d7ad62b6a8e8dfff56b559d9d275e5b9b3a
- https://git.kernel.org/stable/c/67d1189d1095d471ed7fa426c7e384a7140a5dd7
- https://git.kernel.org/stable/c/712e2c8415f55a4a4ddaa98a430b87f624109f69
- https://launchpad.net/bugs/cve/CVE-2024-35831
- https://access.redhat.com/security/cve/CVE-2024-35831
- https://lore.kernel.org/linux-cve-announce/2024051742-CVE-2024-35831-abcc@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2281174
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2281173
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35831
- https://nvd.nist.gov/vuln/detail/CVE-2024-35831
- https://security-tracker.debian.org/tracker/CVE-2024-35831
- https://ubuntu.com/security/CVE-2024-35831
- https://git.kernel.org/linus/67d1189d1095d471ed7fa426c7e384a7140a5dd7
Frequently Asked Questions
What is the severity of CVE-2024-35831?
CVE-2024-35831 has a moderate severity level due to its impact on the Linux kernel's I/O handling.
How do I fix CVE-2024-35831?
To fix CVE-2024-35831, upgrade to kernel version 6.6.23, 6.7.11, 6.8.2, 6.9, or the specified patched versions from Debian.
What systems are affected by CVE-2024-35831?
CVE-2024-35831 affects various versions of the Linux kernel, specifically those from Red Hat and Debian.
What is the nature of the vulnerability in CVE-2024-35831?
CVE-2024-35831 involves improper release of pinned pages in the io_uring subsystem of the Linux kernel.
Is there a workaround for CVE-2024-35831?
There are no specific workarounds for CVE-2024-35831; applying the patches is the recommended approach.
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