Bug 2406777 (CVE-2025-40062)

Summary: CVE-2025-40062 kernel: crypto: hisilicon/qm - set NULL to qm->debug.qm_diff_regs
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-28 12:04:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

crypto: hisilicon/qm - set NULL to qm->debug.qm_diff_regs

When the initialization of qm->debug.acc_diff_reg fails,
the probe process does not exit. However, after qm->debug.qm_diff_regs is
freed, it is not set to NULL. This can lead to a double free when the
remove process attempts to free it again. Therefore, qm->debug.qm_diff_regs
should be set to NULL after it is freed.
Comment 1 Jon Moroney 2025-10-28 20:31:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102816-CVE-2025-40062-9b53@gregkh/T