CVE-2024-35827: io_uring/net: fix overflow check in io_recvmsg_mshot_prep()
First published: Fri May 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: io_uring/net: fix overflow check in io_recvmsg_mshot_prep() The "controllen" variable is type size_t (unsigned long). Casting it to int could lead to an integer underflow. The check_add_overflow() function considers the type of the destination which is type int. If we add two positive values and the result cannot fit in an integer then that's counted as an overflow. However, if we cast "controllen" to an int and it turns negative, then negative values *can* fit into an int type so there is no overflow. Good: 100 + (unsigned long)-4 = 96 <-- overflow Bad: 100 + (int)-4 = 96 <-- no overflow I deleted the cast of the sizeof() as well. That's not a bug but the cast is unnecessary.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.83 | 6.1.83 |
| 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 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 | |
| Linux Kernel | >=6.0<6.1.83 | |
| Linux Kernel | >=6.2<6.6.23 | |
| Linux Kernel | >=6.7<6.7.11 | |
| Linux Kernel | >=6.8<6.8.2 |
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Reference Links
- https://git.kernel.org/stable/c/0c8c74bb59e7d77554016efc34c2d10376985e5e
- https://git.kernel.org/stable/c/59a534690ecc3af72c6ab121aeac1237a4adae66
- https://git.kernel.org/stable/c/868ec868616438df487b9e2baa5a99f8662cc47c
- https://git.kernel.org/stable/c/8ede3db5061bb1fe28e2c9683329aafa89d2b1b4
- https://git.kernel.org/stable/c/b6563ad0d599110bd5cf8f56c47d279c3ed796fe
- https://launchpad.net/bugs/cve/CVE-2024-35827
- https://access.redhat.com/security/cve/CVE-2024-35827
- https://lore.kernel.org/linux-cve-announce/2024051741-CVE-2024-35827-822c@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2281184
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2281183
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35827
- https://nvd.nist.gov/vuln/detail/CVE-2024-35827
- https://security-tracker.debian.org/tracker/CVE-2024-35827
- https://ubuntu.com/security/CVE-2024-35827
- https://git.kernel.org/linus/8ede3db5061bb1fe28e2c9683329aafa89d2b1b4
Frequently Asked Questions
What is the severity of CVE-2024-35827?
CVE-2024-35827 has a high severity due to the potential for integer underflow causing system instability.
How do I fix CVE-2024-35827?
To fix CVE-2024-35827, update the kernel to a patched version such as 6.1.83, 6.6.23, 6.7.11, 6.8.2, or 6.9 for Red Hat systems, or appropriate Debian kernel versions.
What systems are affected by CVE-2024-35827?
CVE-2024-35827 affects multiple Linux kernel versions, particularly those in the Red Hat and Debian distributions.
Is there a workaround for CVE-2024-35827?
Currently, there is no reliable workaround for CVE-2024-35827 aside from applying the recommended updates.
When was CVE-2024-35827 disclosed?
CVE-2024-35827 was disclosed in early 2024, highlighting a critical issue in the Linux kernel's io_uring component.
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