Bug 2468188 (CVE-2026-43397)

Summary: CVE-2026-43397 kernel: drm/bridge: samsung-dsim: Fix memory leak in error path
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `drm/bridge: samsung-dsim` module. Improper error handling in the `samsung_dsim_host_attach()` function can lead to a memory leak. If the `drm_bridge_add()` operation is successful but subsequent operations fail, the bridge is not properly removed, causing memory to be retained. Over time, this unreleased memory can accumulate, potentially leading to a Denial of Service (DoS) condition where the system becomes unstable or unresponsive.
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Description OSIDB Bzimport 2026-05-08 15:03:46 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/bridge: samsung-dsim: Fix memory leak in error path

In samsung_dsim_host_attach(), drm_bridge_add() is called to add the
bridge. However, if samsung_dsim_register_te_irq() or
pdata->host_ops->attach() fails afterwards, the function returns
without removing the bridge, causing a memory leak.

Fix this by adding proper error handling with goto labels to ensure
drm_bridge_remove() is called in all error paths. Also ensure that
samsung_dsim_unregister_te_irq() is called if the attach operation
fails after the TE IRQ has been registered.

samsung_dsim_unregister_te_irq() function is moved without changes
to be before samsung_dsim_host_attach() to avoid forward declaration.
Comment 1 Keith Grant 2026-05-08 21:58:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050838-CVE-2026-43397-2864@gregkh/T