CVE-2026-68090
Estado: RecibidaSin puntuar—
In the Linux kernel, the following vulnerability has been resolved:
debugobjects: Plug race against a concurrent OOM disable
syzbot reported a puzzling splat:
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:
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:
Leer descripción completaMostrar menos
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.
Detalles técnicos trazas, registros y código del informe original
WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20
ODEBUG: Out of memory. ODEBUG disabled
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(...)CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/1f4f02b336c3be125c8fcf87df73db2e0e028b8b
- https://git.kernel.org/stable/c/203a965bf2ab43130778d8214fb0c3c8c2d19cdf
- https://git.kernel.org/stable/c/23da32e88627e63e0864f59f4c63a2dc0ab851a3
- https://git.kernel.org/stable/c/2d5e320b7ab9b25229ac4331541964a58b5e1d29
- https://git.kernel.org/stable/c/b81dde13cc163450dcb402dcc915ef13ba241e01
- https://git.kernel.org/stable/c/c00164c9e7fa6145886ad666806cb5347895de5c
- https://git.kernel.org/stable/c/d663fbf28b2eebe665bb9cf828d7d528e5a8707e
- https://git.kernel.org/stable/c/e2e255d07723c330dded8e576ce28a8d23a692ce
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-68090",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "2d5e320b7ab9b25229ac4331541964a58b5e1d29",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "203a965bf2ab43130778d8214fb0c3c8c2d19cdf",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "23da32e88627e63e0864f59f4c63a2dc0ab851a3",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "d663fbf28b2eebe665bb9cf828d7d528e5a8707e",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "e2e255d07723c330dded8e576ce28a8d23a692ce",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "c00164c9e7fa6145886ad666806cb5347895de5c",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "1f4f02b336c3be125c8fcf87df73db2e0e028b8b",
"versionType": "git"
},
{
"status": "affected",
"version": "b84d435cc228e87951f3bbabf6cc4a5f25d5fb16",
"lessThan": "b81dde13cc163450dcb402dcc915ef13ba241e01",
"versionType": "git"
}
],
"programFiles": [
"lib/debugobjects.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"lib/debugobjects.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-10T12:17:21.717",
"references": [
{
"url": "https://git.kernel.org/stable/c/1f4f02b336c3be125c8fcf87df73db2e0e028b8b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/203a965bf2ab43130778d8214fb0c3c8c2d19cdf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/23da32e88627e63e0864f59f4c63a2dc0ab851a3",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2d5e320b7ab9b25229ac4331541964a58b5e1d29",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b81dde13cc163450dcb402dcc915ef13ba241e01",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c00164c9e7fa6145886ad666806cb5347895de5c",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d663fbf28b2eebe665bb9cf828d7d528e5a8707e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e2e255d07723c330dded8e576ce28a8d23a692ce",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndebugobjects: Plug race against a concurrent OOM disable\n\nsyzbot reported a puzzling splat:\n\n WARNING: kernel/time/hrtimer.c:443 at stub_timer+0xa/0x20\n\nstub_timer() is installed as timer callback function in\nhrtimer_fixup_assert_init(), which is invoked when\ndebug_object_assert_init() can't find a shadow object. In that case debug\nobjects emits a warning about it before invoking the fixup.\n\nThough the provided console log lacks this warning and instead has the\nfollowing a few seconds before the splat:\n\n ODEBUG: Out of memory. ODEBUG disabled\n\nSo the object was looked up in debug_object_assert_init() and the lookup\nfailed due a concurrent out of memory situation which disabled debug\nobjects and freed the shadow objects:\n\ndebug_object_assert_init()\n if (!debug_objects_enabled)\n \treturn; obj = alloc();\n \t\t\t\tif (!obj) {\n\t\t\t\t\t\t\t// Out of memory\n \tdebug_objects_enabled = false;\n free_objects();\n obj = lookup_or_alloc();\n\n // The lookup failed because the other side\n // removed the objects, so this returns\n // an error code as the object in question\n // is not statically initialized\n\n\tif (!IS_ERR_OR_NULL(obj))\n \treturn;\n if (!obj) {\n \tdebug_oom();\n return;\n }\n\n print(...)\n if (!debug_objects_enabled)\n return;\n\n fixup(...)\n\nThe debug object splat is skipped because debug_objects_enabled is false,\nbut the fixup callback is invoked unconditionally, which makes the timer\ndisfunctional.\n\nThis is only a problem in debug_object_assert_init() and\ndebug_object_activate() as both have to handle statically initialized\nobjects and therefore must handle the error pointer return case\ngracefully. All other places only handle the found/not found case and the\nNULL pointer return is a signal for OOM. Otherwise they get a valid shadow\nobject.\n\nPlug the hole by checking whether debug objects are still enabled before\ninvoking the print and fixup function in those two places."
}
],
"lastModified": "2026-08-17T05:18:08.173",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}