CVE-2024-39480

HIGH
Published Jul 5, 2024 Modified Nov 21, 2024 CWE-120 CWE-121

Description

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.

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CVSS v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-120 CWE-120
CWE-121 CWE-121

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

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/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

Frequently Asked Questions

What is CVE-2024-39480? +
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. It has a CVSS v3.1 base score of 7.8 (HIGH).
How severe is CVE-2024-39480? +
CVE-2024-39480 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2024-39480? +
CVE-2024-39480 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-39480? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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