CVE-2025-39685

01/Description

In the Linux kernel, the following vulnerability has been resolved: comedi: pcl726: Prevent invalid irq number The reproducer passed in an irq number(0x80008000) that was too large, which triggered the oob. Added an interrupt number check to prevent users from passing in an irq number that was too large. If `it->options[1]` is 31, then `1 << it->options[1]` is still invalid because it shifts a 1-bit into the sign bit (which is UB in C). Possible solutions include reducing the upper bound on the `it->options[1]` value to 30 or lower, or using `1U << it->options[1]`. The old code would just not attempt to request the IRQ if the `options[1]` value were invalid. And it would still configure the device without interrupts even if the call to `request_irq` returned an error. So it would be better to combine this test with the test below.

02/Affected products

linux: linux kernel; debian: debian linux

03/References8

• git.kernel.org/stable/c/0eb4ed2aa261dee228f1668dbfa6d87353e8162d Patch
• git.kernel.org/stable/c/5a33d07c94ba91306093e823112a7aa9727549f6 Patch
• git.kernel.org/stable/c/96cb948408b3adb69df7e451ba7da9d21f814d00 Patch
• git.kernel.org/stable/c/a3cfcd0c78c80ca7cd80372dc28f77d01be57bf6 Patch
• git.kernel.org/stable/c/bab220b0bb5af652007e278e8e8357f952b0e1ea Patch
• git.kernel.org/stable/c/d8992c9a01f81128f36acb7c5755530e21fcd059 Patch
• lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory
• cert-portal.siemens.com/productcert/html/ssa-032379.html