CVE-2024-39480: kdb: Fix buffer overflow during tab-complete
First published: Fri Jul 05 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: kdb: Fix buffer overflow during tab-complete Currently, when the user attempts symbol completion with the Tab key, kdb will use strncpy() to insert the completed symbol into the command buffer. Unfortunately it passes the size of the source buffer rather than the destination to strncpy() with predictably horrible results. Most obviously if the command buffer is already full but cp, the cursor position, is in the middle of the buffer, then we will write past the end of the supplied buffer. Fix this by replacing the dubious strncpy() calls with memmove()/memcpy() calls plus explicit boundary checks to make sure we have enough space before we start moving characters around.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.19<4.19.316 | |
| Linux Kernel | >=5.4<5.4.278 | |
| Linux Kernel | >=5.10<5.10.219 | |
| Linux Kernel | >=5.15<5.15.161 | |
| Linux Kernel | >=6.1<6.1.94 | |
| Linux Kernel | >=6.6<6.6.34 | |
| Linux Kernel | >=6.9<6.9.5 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://launchpad.net/bugs/cve/CVE-2024-39480
- https://git.kernel.org/stable/c/107e825cc448b7834b31e8b1b3cf0f57426d46d5
- https://git.kernel.org/stable/c/33d9c814652b971461d1e30bead6792851c209e7
- https://git.kernel.org/stable/c/cfdc2fa4db57503bc6d3817240547c8ddc55fa96
- https://git.kernel.org/stable/c/ddd2972d8e2dee3b33e8121669d55def59f0be8a
- https://git.kernel.org/stable/c/e9730744bf3af04cda23799029342aa3cddbc454
- https://git.kernel.org/stable/c/f636a40834d22e5e3fc748f060211879c056cd33
- https://git.kernel.org/stable/c/f694da720dcf795dc3eb97bf76d220213f76aaa7
- https://git.kernel.org/stable/c/fb824a99e148ff272a53d71d84122728b5f00992
- https://git.kernel.org/linus/e9730744bf3af04cda23799029342aa3cddbc454
- https://security-tracker.debian.org/tracker/CVE-2024-39480
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-39480
- https://nvd.nist.gov/vuln/detail/CVE-2024-39480
- https://ubuntu.com/security/CVE-2024-39480
Frequently Asked Questions
What is the severity of CVE-2024-39480?
CVE-2024-39480 has been rated as a high severity vulnerability due to its potential for causing buffer overflow issues.
How do I fix CVE-2024-39480?
To fix CVE-2024-39480, update to the patched versions of the Linux kernel mentioned in the vulnerability details.
Which versions of the Linux kernel are affected by CVE-2024-39480?
CVE-2024-39480 affects various versions of the Linux kernel, specifically those between 4.19 and 6.9.5.
What type of vulnerability is CVE-2024-39480?
CVE-2024-39480 is a buffer overflow vulnerability that occurs during symbol completion using the Tab key in kdb.
Is there a workaround for CVE-2024-39480?
Currently, there is no known workaround for CVE-2024-39480, so users should apply the necessary updates.
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