Bug 2395433 (CVE-2022-50322)

Summary: CVE-2022-50322 kernel: Linux kernel: Denial of Service due to function prototype mismatch
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel. A local attacker with low privileges could trigger a function prototype mismatch in the `rtc: msc313` component's `msc313_rtc_probe()` function. This issue, related to kernel Control Flow Integrity (kCFI) validation, can lead to a system crash or process termination, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2025-09-15 15:13:36 UTC 
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.
Comment 1 Jon Moroney 2025-09-15 16:17:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091553-CVE-2022-50322-079d@gregkh/T