CVE-2024-39480

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < fb824a99e148ff272a53d71d84122728b5f00992affected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < ddd2972d8e2dee3b33e8121669d55def59f0be8aaffected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < cfdc2fa4db57503bc6d3817240547c8ddc55fa96affected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < f636a40834d22e5e3fc748f060211879c056cd33affected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < 33d9c814652b971461d1e30bead6792851c209e7affected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < 107e825cc448b7834b31e8b1b3cf0f57426d46d5affected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < f694da720dcf795dc3eb97bf76d220213f76aaa7affected
LinuxLinux5d5314d6795f3c1c0f415348ff8c51f7de042b77 < e9730744bf3af04cda23799029342aa3cddbc454affected
LinuxLinux2.6.35affected
LinuxLinux0 < 2.6.35unaffected
LinuxLinux4.19.316 <= 4.19.*unaffected
LinuxLinux5.4.278 <= 5.4.*unaffected
LinuxLinux5.10.219 <= 5.10.*unaffected
LinuxLinux5.15.161 <= 5.15.*unaffected
LinuxLinux6.1.94 <= 6.1.*unaffected
LinuxLinux6.6.34 <= 6.6.*unaffected
LinuxLinux6.9.5 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References