Bug 2541174 (CVE-2026-97600)

Summary: CVE-2026-97600 kernel: ieee802154: cc2520: fix FIFOP work use-after-free
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's CC2520 radio driver. During device removal, an interrupt handler can queue background work after the driver's private data has been released, resulting in a use-after-free condition. A local user with privileges to disconnect or unbind the device could exploit this flaw to cause a system crash and Denial of Service (DoS) or potentially execute arbitrary code.
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Description OSIDB Bzimport 2026-09-25 10:54:50 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ieee802154: cc2520: fix FIFOP work use-after-free

The FIFOP interrupt handler queues cc2520_fifop_irqwork.  On removal,
cc2520_remove() only flushes the work.  The devm-managed FIFOP IRQ
remains active until after ->remove() returns and can queue the work
again after that flush, allowing it to run after the private data is
released.

Disable the work with disable_work_sync() instead of flushing it, so
the handler can no longer queue it once removal begins.  Destroy the
buffer mutex last, since the worker and the stop callback invoked
through ieee802154_unregister_hw() both take it.

Found by an in-house static analysis tool.
Comment 1 gkamathe 2026-09-29 11:50:04 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97600.mbox