CVE-2024-56531

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: caiaq: Use snd_card_free_when_closed() at disconnection

The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses snd_card_free() at disconnection, but this waits for the close of all used fds, hence it can take long. It eventually blocks the upper layer USB ioctls, which may trigger a soft lockup.

An easy workaround is to replace snd_card_free() with snd_card_free_when_closed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close.

This patch also splits the code to the disconnect and the free phases; the former is called immediately at the USB disconnect callback while the latter is called from the card destructor.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 3993edf44d3df7b6e8c753eac6ac8783473fcbabaffected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < ebad462eec93b0f701dfe4de98990e7355283801affected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 4dd821dcbfcecf7af6a08370b0b217cde2818acfaffected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < cadf1d8e9ddcd74584ec961aeac14ac549b261d8affected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 237f3faf0177bdde728fa3106d730d806436aa4daffected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < 4507a8b9b30344c5ddd8219945f446d47e966a6daffected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < dd0de8cb708951cebf727aa045e8242ba651bb52affected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < a3f9314752dbb6f6aa1f0f2b4c58243bda800738affected
LinuxLinux523f1dce37434a9a6623bf46e7893e2b4b10ac3c < b04dcbb7f7b1908806b7dc22671cdbe78ff2b82caffected
LinuxLinux2.6.22affected
LinuxLinux0 < 2.6.22unaffected
LinuxLinux4.19.325 <= 4.19.*unaffected
LinuxLinux5.4.287 <= 5.4.*unaffected
LinuxLinux5.10.231 <= 5.10.*unaffected
LinuxLinux5.15.174 <= 5.15.*unaffected
LinuxLinux6.1.120 <= 6.1.*unaffected
LinuxLinux6.6.64 <= 6.6.*unaffected
LinuxLinux6.11.11 <= 6.11.*unaffected
LinuxLinux6.12.2 <= 6.12.*unaffected
LinuxLinux6.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

References