Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rpmsg: glink: fix deadlock in endpoint destroy during driver detach During driver detach, the device core holds the device mutex throughout the driver's remove callback chain. When the rpmsg endpoint is destroyed as part of that teardown, the GLINK endpoint destroy implementation attempts to unregister the underlying rpmsg device. That unregistration calls device_del(), which tries to re-acquire the same device mutex already held higher up the stack, causing rmmod to hang indefinitely. The deadlock manifests with the following call chain: [<0>] device_del+0x44/0x414 <- tries to acquire same mutex [<0>] device_unregister+0x18/0x34 [<0>] rpmsg_unregister_device+0x28/0x4c [<0>] qcom_glink_remove_rpmsg_device+0x70/0xc0 [<0>] qcom_glink_destroy_ept+0x58/0xbc [<0>] rpmsg_dev_remove+0x50/0x60 [<0>] device_remove+0x4c/0x80 [<0>] device_release_driver_internal+0x1cc/0x228 <- acquires device mutex [<0>] driver_detach+0x4c/0x98 [<0>] bus_remove_driver+0x6c/0xbc [<0>] driver_unregister+0x30/0x60 [<0>] unregister_rpmsg_driver+0x10/0x1c [<0>] fastrpc_exit+0x28/0x38 [fastrpc] [<0>] __arm64_sys_delete_module+0x1b8/0x294 [<0>] invoke_syscall+0x48/0x10c [<0>] el0_svc_common.constprop.0+0xc0/0xe0 [<0>] do_el0_svc+0x1c/0x28 [<0>] el0_svc+0x34/0x108 [<0>] el0t_64_sync_handler+0xa0/0xe4 [<0>] el0t_64_sync+0x198/0x19c The rpmsg device unregistration inside endpoint destroy is redundant. In both contexts where endpoint destruction is triggered: - Driver detach path: the driver core already tears down the rpmsg device. - Channel close path: the rpmsg device is already unregistered before endpoint destruction is reached. Remove the redundant unregistration to fix the deadlock.
References
- https://git.kernel.org/stable/c/48f55b90f0d713e477e26b85d7327d9592d016f9
- https://git.kernel.org/stable/c/5a5a48e788e02fd8a8eb7188ce440572d6c12418
- https://git.kernel.org/stable/c/73092c2292aa65515671e54abbcda2166d3827ed
- https://git.kernel.org/stable/c/8597f669a5268e0dcf243e2b2d6ca00370117057
- https://git.kernel.org/stable/c/bbc236357876d35a624030e5c50eedbc380be98e
- https://git.kernel.org/stable/c/cbcdf96e1c87bc07055d04264018ded1f3bafffb
- https://git.kernel.org/stable/c/e559626bee8a6632aafc08eedcdb4bf26ca245c5
- https://git.kernel.org/stable/c/ecad679e2b92c419cc22cc8f257cd457d5192647
FAQ
What is CVE-2026-93098?
CVE-2026-93098 is a documented vulnerability. In the Linux kernel, the following vulnerability has been resolved: rpmsg: glink: fix deadlock in endpoint destroy during driver detach During driver detach, the device core holds the device mutex t...
How severe is CVE-2026-93098?
CVSS scoring is not yet available for CVE-2026-93098. Check NVD for updates.
Is there a patch for CVE-2026-93098?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.