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CVE-2022-50322

rtc: msc313: Fix function prototype mismatch in msc313_rtc_probe()

Description

In the Linux kernel, the following vulnerability has been resolved: rtc: msc313: Fix function prototype mismatch in msc313_rtc_probe() With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. msc313_rtc_probe() was passing clk_disable_unprepare() directly, which did not have matching prototypes for devm_add_action_or_reset()'s callback argument. Refactor to use devm_clk_get_enabled() instead. This was found as a result of Clang's new -Wcast-function-type-strict flag, which is more sensitive than the simpler -Wcast-function-type, which only checks for type width mismatches.

Timeline

  1. ID reserved

    By Linux

  2. Published

  3. · 14 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2022-50322, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.16% · top 95% of all CVEs (11 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected be7d9c9161b9c76edeff15e79edc2f256568fe05 – < 5affaaf3334c9274131dae889ed79ea0553d61b4
    • affected be7d9c9161b9c76edeff15e79edc2f256568fe05 – < ba50fee6b41bcbafaeed3c51f90d37d1480ff9a0
    • affected be7d9c9161b9c76edeff15e79edc2f256568fe05 – < 21b8a1dd56a163825e5749b303858fb902ebf198

  • Linux · Linux

    • affected 5.16
    • unaffected < 5.16
    • unaffected 6.0.17 – ≤ 6.0.*
    • unaffected 6.1.3 – ≤ 6.1.*
    • unaffected 6.2 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .