Bug 2495952 (CVE-2026-53327) - CVE-2026-53327 kernel: debugobjects: Do not fill_pool() if pi_blocked_on
Summary: CVE-2026-53327 kernel: debugobjects: Do not fill_pool() if pi_blocked_on
Keywords:
Status: NEW
Alias: CVE-2026-53327
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-01 14:03 UTC by OSIDB Bzimport
Modified: 2026-07-01 16:32 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-07-01 14:03:17 UTC 
In the Linux kernel, the following vulnerability has been resolved:

debugobjects: Do not fill_pool() if pi_blocked_on

On RT enabled kernels, fill_pool() ends up calling rtlock_lock(), which
asserts if current::pi_blocked_on is set, because a task can obviously only
block on one lock as otherwise the priority inheritenace chain gets
corrupted.

Prevent this by expanding the conditional to take current::pi_blocked_on
into account.
Comment 1 Mauro Matteo Cascella 2026-07-01 16:28:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026070141-CVE-2026-53327-9db6@gregkh/T
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