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CVE-2026-68090— debugobjects: Plug race against a concurrent OOM disable

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.3版本、5.10.261及之前版本、5.15.212及之前版本、6.1.178及之前版本、6.6.145及之前版本、6.12.96及之前版本、6.18.39及之前版本和7.1.4及之前版本存在安全漏洞，该漏洞源于debugobjects模块存在与并发OOM禁用操作相关的竞争条件，未在调用打印和修复回调函数前检查调试对象是否仍处于启用状态，可能导致定时器功能异常，触发内核运行异常。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< 2d5e320b7ab9b25229ac4331541964a58b5e1d29 affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< 203a965bf2ab43130778d8214fb0c3c8c2d19cdf affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< 23da32e88627e63e0864f59f4c63a2dc0ab851a3 affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< d663fbf28b2eebe665bb9cf828d7d528e5a8707e affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< e2e255d07723c330dded8e576ce28a8d23a692ce affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< c00164c9e7fa6145886ad666806cb5347895de5c affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< 1f4f02b336c3be125c8fcf87df73db2e0e028b8b affected
b84d435cc228e87951f3bbabf6cc4a5f25d5fb16< b81dde13cc163450dcb402dcc915ef13ba241e01 affected
… +10 more rows
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I. Basic Information for CVE-2026-68090

Vulnerability Information
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Vulnerability Title
debugobjects: Plug race against a concurrent OOM disable
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 3.3版本、5.10.261及之前版本、5.15.212及之前版本、6.1.178及之前版本、6.6.145及之前版本、6.12.96及之前版本、6.18.39及之前版本和7.1.4及之前版本存在安全漏洞，该漏洞源于debugobjects模块存在与并发OOM禁用操作相关的竞争条件，未在调用打印和修复回调函数前检查调试对象是否仍处于启用状态，可能导致定时器功能异常，触发内核运行异常。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 ~ 2d5e320b7ab9b25229ac4331541964a58b5e1d29 -
Linux Linux 3.3 -

II. Public POCs for CVE-2026-68090

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III. Intelligence Information for CVE-2026-68090

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Patches & Fixes for CVE-2026-68090 (8)

Same Patch Batch · Linux · 2026-08-10 · 344 CVEs total

CVE-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68381 9.8 CRITICAL ksmbd: pin conn during async oplock break notification
CVE-2026-68385 9.8 CRITICAL s390/checksum: Fix csum_partial() without vector facility
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68144 9.8 CRITICAL phonet: pep: fix use-after-free in pep_get_sb()
CVE-2026-68137 9.8 CRITICAL net/x25: fix use-after-free in x25_kill_by_neigh()
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68124 9.6 CRITICAL mctp: serial: handle zero-length frames to prevent rx buffer overflow

Showing top 20 of 344 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68090

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