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Unrated severityNVD Advisory· Published Jul 5, 2024· Updated Jan 5, 2026

kdb: Fix buffer overflow during tab-complete

CVE-2024-39480

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.

Affected products

62

Patches

8
cfdc2fa4db57
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
ddd2972d8e2d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
e9730744bf3a
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
f694da720dcf
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
107e825cc448
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
33d9c814652b
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
f636a40834d2
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
fb824a99e148
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

8

News mentions

0

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