Bug 2492394 (CVE-2026-52962)

Summary: CVE-2026-52962 kernel: ceph: fix a buffer leak in __ceph_setxattr()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel, specifically within the Ceph file system's extended attribute handling. A buffer leak occurs in the `__ceph_setxattr()` function because a previously allocated buffer (`old_blob`) is not properly released. This can lead to resource exhaustion over time, potentially causing a denial of service (DoS) for affected systems.
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Description OSIDB Bzimport 2026-06-24 18:09:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ceph: fix a buffer leak in __ceph_setxattr()

The old_blob in __ceph_setxattr() can store
ci->i_xattrs.prealloc_blob value during the retry.
However, it is never called the ceph_buffer_put()
for the old_blob object. This patch fixes the issue of
the buffer leak.
Comment 1 Mauro Matteo Cascella 2026-06-26 15:01:22 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062437-CVE-2026-52962-69b4@gregkh/T