debugobjects: Plug race against a concurrent OOM disable

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68090
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 12:17:21 UTC
Updated2026-08-17 05:18:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: debugobjects: Plug race against a concurrent OOM disable syzbot reported a puzzling splat: WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20 stub_timer() is installed as timer callback function in hrtimer_fixup_assert_init(), which is invoked when debug_object_assert_init() can't find a shadow object. In that case debug objects emits a warning about it before invoking the fixup. Though the provided console log lacks this warning and instead has the following a few seconds before the splat: ODEBUG: Out of memory. ODEBUG disabled So the object was looked up in debug_object_assert_init() and the lookup failed due a concurrent out of memory situation which disabled debug objects and freed the shadow objects: debug_object_assert_init() if (!debug_objects_enabled) return; obj = alloc(); if (!obj) { // Out of memory debug_objects_enabled = false; free_objects(); obj = lookup_or_alloc(); // The lookup failed because the other side // removed the objects, so this returns // an error code as the object in question // is not statically initialized if (!IS_ERR_OR_NULL(obj)) return; if (!obj) { debug_oom(); return; } print(...) if (!debug_objects_enabled) return; fixup(...) The debug object splat is skipped because debug_objects_enabled is false, but the fixup callback is invoked unconditionally, which makes the timer disfunctional. This is only a problem in debug_object_assert_init() and debug_object_activate() as both have to handle statically initialized objects and therefore must handle the error pointer return case gracefully. All other places only handle the found/not found case and the NULL pointer return is a signal for OOM. Otherwise they get a valid shadow object. Plug the hole by checking whether debug objects are still enabled before invoking the print and fixup function in those two places.

Risk And Classification

EPSS: 0.001760000 probability, percentile 0.074670000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 2d5e320b7ab9b25229ac4331541964a58b5e1d29 git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 203a965bf2ab43130778d8214fb0c3c8c2d19cdf git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 23da32e88627e63e0864f59f4c63a2dc0ab851a3 git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 d663fbf28b2eebe665bb9cf828d7d528e5a8707e git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 e2e255d07723c330dded8e576ce28a8d23a692ce git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 c00164c9e7fa6145886ad666806cb5347895de5c git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 1f4f02b336c3be125c8fcf87df73db2e0e028b8b git Not specified
CNA Linux Linux affected b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 b81dde13cc163450dcb402dcc915ef13ba241e01 git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2d5e320b7ab9b25229ac4331541964a58b5e1d29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d663fbf28b2eebe665bb9cf828d7d528e5a8707e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c00164c9e7fa6145886ad666806cb5347895de5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b81dde13cc163450dcb402dcc915ef13ba241e01 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/23da32e88627e63e0864f59f4c63a2dc0ab851a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/203a965bf2ab43130778d8214fb0c3c8c2d19cdf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e2e255d07723c330dded8e576ce28a8d23a692ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f4f02b336c3be125c8fcf87df73db2e0e028b8b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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