CVE-2026-68090 (GCVE-0-2026-68090)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:51 – Updated: 2026-08-17 04:58
VLAI
Title
debugobjects: Plug race against a concurrent OOM disable
Summary
In 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < 2d5e320b7ab9b25229ac4331541964a58b5e1d29 (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < 203a965bf2ab43130778d8214fb0c3c8c2d19cdf (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < 23da32e88627e63e0864f59f4c63a2dc0ab851a3 (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < d663fbf28b2eebe665bb9cf828d7d528e5a8707e (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < e2e255d07723c330dded8e576ce28a8d23a692ce (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < c00164c9e7fa6145886ad666806cb5347895de5c (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < 1f4f02b336c3be125c8fcf87df73db2e0e028b8b (git)
Affected: b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 , < b81dde13cc163450dcb402dcc915ef13ba241e01 (git)
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Linux Linux Affected: 3.3
Unaffected: 0 , < 3.3 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "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\u0027t 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:58:38.177Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/b81dde13cc163450dcb402dcc915ef13ba241e01"
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      ],
      "title": "debugobjects: Plug race against a concurrent OOM disable",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68090",
    "datePublished": "2026-08-10T11:51:45.149Z",
    "dateReserved": "2026-07-30T09:28:09.367Z",
    "dateUpdated": "2026-08-17T04:58:38.177Z",
    "state": "PUBLISHED"
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      "date": "2026-08-20",
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      "percentile": "0.07484"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"lib/debugobjects.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"lib/debugobjects.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-11T11:25:34+00:00",
      "cve": "CVE-2026-68090",
      "id": "CVE-2026-68090",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: debugobjects: Plug race against a concurrent OOM disable",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68090.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-11T23:48:44Z",
      "cve": "CVE-2026-68090",
      "id": "CVE-2026-68090",
      "initial_release_date": "2026-08-11T23:48:44Z",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "267",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68090",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68090.json",
      "version": "2"
    }
  }
}



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