rpmsg: glink: fix deadlock in endpoint destroy during driver detach

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93098
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:18:03 UTC
Updated2026-09-17 17:18:03 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 93b6b9e4acff4794e7426d3ad64ef14e3b3e8919 73092c2292aa65515671e54abbcda2166d3827ed git Not specified
CNA Linux Linux affected 24fd02c3a4798de7dc94b55d36a1685fe6cdaf69 bbc236357876d35a624030e5c50eedbc380be98e git Not specified
CNA Linux Linux affected 32fe8cdf541863239b81c80b8b04112d6e8792cf 8597f669a5268e0dcf243e2b2d6ca00370117057 git Not specified
CNA Linux Linux affected c6210714347f72bae8e7142dc0a7f99923c466e7 48f55b90f0d713e477e26b85d7327d9592d016f9 git Not specified
CNA Linux Linux affected fcab5c2672f8dac3d77013dbe047b2441f4141f5 cbcdf96e1c87bc07055d04264018ded1f3bafffb git Not specified
CNA Linux Linux affected f80e4e91b010ee7d6c52f24d069975ac955ac6b2 ecad679e2b92c419cc22cc8f257cd457d5192647 git Not specified
CNA Linux Linux affected a53e356df548f6b0e82529ef3cc6070f42622189 e559626bee8a6632aafc08eedcdb4bf26ca245c5 git Not specified
CNA Linux Linux affected a53e356df548f6b0e82529ef3cc6070f42622189 5a5a48e788e02fd8a8eb7188ce440572d6c12418 git Not specified
CNA Linux Linux affected 5.10.248 5.10.270 semver Not specified
CNA Linux Linux affected 5.15.198 5.15.221 semver Not specified
CNA Linux Linux affected 6.1.160 6.1.188 semver Not specified
CNA Linux Linux affected 6.6.120 6.6.157 semver Not specified
CNA Linux Linux affected 6.12.64 6.12.110 semver Not specified
CNA Linux Linux affected 6.18.3 6.18.52 semver Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5a5a48e788e02fd8a8eb7188ce440572d6c12418 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48f55b90f0d713e477e26b85d7327d9592d016f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bbc236357876d35a624030e5c50eedbc380be98e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ecad679e2b92c419cc22cc8f257cd457d5192647 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e559626bee8a6632aafc08eedcdb4bf26ca245c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/73092c2292aa65515671e54abbcda2166d3827ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cbcdf96e1c87bc07055d04264018ded1f3bafffb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8597f669a5268e0dcf243e2b2d6ca00370117057 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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