CVE-2024-58084

Summary

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

firmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool()

Commit 2e4955167ec5 ("firmware: qcom: scm: Fix __scm and waitq completion variable initialization") introduced a write barrier in probe function to store global '__scm' variable. We all known barriers are paired (see memory-barriers.txt: "Note that write barriers should normally be paired with read or address-dependency barriers"), therefore accessing it from concurrent contexts requires read barrier. Previous commit added such barrier in qcom_scm_is_available(), so let's use that directly.

Lack of this read barrier can result in fetching stale '__scm' variable value, NULL, and dereferencing it.

Note that barrier in qcom_scm_is_available() satisfies here the control dependency.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux449d0d84bcd8246b508d07995326d13c54488b8c < fee921e3c641f64185abee83f9a6e65f0b380682affected
LinuxLinux449d0d84bcd8246b508d07995326d13c54488b8c < e03db7c1255ebabba5e1a447754faeb138de15a2affected
LinuxLinux449d0d84bcd8246b508d07995326d13c54488b8c < b628510397b5cafa1f5d3e848a28affd1c635302affected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.12.14 <= 6.12.*unaffected
LinuxLinux6.13.3 <= 6.13.*unaffected
LinuxLinux6.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References