CVE-2022-49640

Summary

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

sysctl: Fix data races in proc_douintvec_minmax().

A sysctl variable is accessed concurrently, and there is always a chance of data-race. So, all readers and writers need some basic protection to avoid load/store-tearing.

This patch changes proc_douintvec_minmax() to use READ_ONCE() and WRITE_ONCE() internally to fix data-races on the sysctl side. For now, proc_douintvec_minmax() itself is tolerant to a data-race, but we still need to add annotations on the other subsystem's side.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux61d9b56a89208d8cccd0b4cfec7e6959717e16e3 < e3a2144b3b6bf9ecafd91087c8b8b48171ec19dfaffected
LinuxLinux61d9b56a89208d8cccd0b4cfec7e6959717e16e3 < 40e0477a7371d101c55b69d9c32a7a1ed82ab5eaaffected
LinuxLinux61d9b56a89208d8cccd0b4cfec7e6959717e16e3 < b60eddf98b9716651069dfda296c91311a7a6293affected
LinuxLinux61d9b56a89208d8cccd0b4cfec7e6959717e16e3 < 2d3b559df3ed39258737789aae2ae7973d205bc1affected
LinuxLinux4.13affected
LinuxLinux0 < 4.13unaffected
LinuxLinux5.10.132 <= 5.10.*unaffected
LinuxLinux5.15.56 <= 5.15.*unaffected
LinuxLinux5.18.13 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References