CVE-2022-49291

Summary

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

ALSA: pcm: Fix races among concurrent hw_params and hw_free calls

Currently we have neither proper check nor protection against the concurrent calls of PCM hw_params and hw_free ioctls, which may result in a UAF. Since the existing PCM stream lock can't be used for protecting the whole ioctl operations, we need a new mutex to protect those racy calls.

This patch introduced a new mutex, runtime->buffer_mutex, and applies it to both hw_params and hw_free ioctl code paths. Along with it, the both functions are slightly modified (the mmap_count check is moved into the state-check block) for code simplicity.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a42aa926843acca96c0dfbde2e835b8137f2f092affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9cb6c40a6ebe4a0cfc9d6a181958211682cffea9affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fbeb492694ce0441053de57699e1e2b7bc148a69affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0f6947f5f5208f6ebd4d76a82a4757e2839a23f8affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 33061d0fba51d2bf70a2ef9645f703c33fe8e438affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0090c13cbbdffd7da079ac56f80373a9a1be0bf8affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1bbf82d9f961414d6c76a08f7f843ea068e0ab7baffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 92ee3c60ec9fe64404dc035e7c41277d74aa26cbaffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux4.14.279 <= 4.14.*unaffected
LinuxLinux4.19.243 <= 4.19.*unaffected
LinuxLinux5.4.193 <= 5.4.*unaffected
LinuxLinux5.10.109 <= 5.10.*unaffected
LinuxLinux5.15.32 <= 5.15.*unaffected
LinuxLinux5.16.18 <= 5.16.*unaffected
LinuxLinux5.17.1 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References