Bug 2492797 (CVE-2026-53210)

Summary:	CVE-2026-53210 kernel: tee: shm: fix shm leak in register_shm_helper()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Trusted Execution Environment (TEE) subsystem. A shared memory (shm) leak occurs in the `register_shm_helper()` function when `TEE_IOC_SHM_REGISTER` is called with a zero-length shared memory registration. This can be triggered by a local attacker, potentially leading to a denial of service due to memory exhaustion.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-06-25 10:06:16 UTC

In the Linux kernel, the following vulnerability has been resolved:

tee: shm: fix shm leak in register_shm_helper()

register_shm_helper() allocates shm before calling
iov_iter_npages(). If iov_iter_npages() returns 0, the function
jumps to err_ctx_put and leaks shm.

This can be triggered by TEE_IOC_SHM_REGISTER with
struct tee_ioctl_shm_register_data where length is 0.

Jump to err_free_shm instead.

Comment 1 TEJ RATHI 2026-06-26 07:16:12 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062503-CVE-2026-53210-7fd4@gregkh/T