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CVE-2026-68357— watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()

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存在安全漏洞，该漏洞源于watchdog pretimeout组件在watchdog_unregister_governor()函数中取消注册看门狗管理器时未正确清除default_gov，导致释放后重用。

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 da0d12ff2b829a35e9921918e925d79497b82bef< b9ae33faa96bdec6bc60e4c5f8f53786182e4207 affected
da0d12ff2b829a35e9921918e925d79497b82bef< 472ec1e34ff0bb26379805cae808f658cce58c35 affected
da0d12ff2b829a35e9921918e925d79497b82bef< 7a2ee3ec6f208307eca1119a343c7b5d39c03708 affected
da0d12ff2b829a35e9921918e925d79497b82bef< 2e47b91b9b4020fcc01def14d6b6556d66074cf4 affected
da0d12ff2b829a35e9921918e925d79497b82bef< 0ca252720f0e38411cfec3431db9bb1aed0a412c affected
da0d12ff2b829a35e9921918e925d79497b82bef< 7d1658b066de30f4b23afc14814d22416a971e6e affected
da0d12ff2b829a35e9921918e925d79497b82bef< 7993d626983cc58fbde9607333cfd2d57725c197 affected
da0d12ff2b829a35e9921918e925d79497b82bef< 7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661 affected
… +10 more rows
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I. Basic Information for CVE-2026-68357

Vulnerability Information
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Vulnerability Title
watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: watchdog: pretimeout: Fix UAF in watchdog_unregister_governor() When a watchdog governor is unregistered, it updates existing watchdog devices that were using this governor by falling back to `default_gov`. If the governor being unregistered is currently set as `default_gov`, the `default_gov` is never cleared. This leads to 2 use-after-free issues: 1. New watchdog devices registered after this point will inherit the dangling `default_gov`. 2. Existing watchdog devices using the unregistered governor will have their `wdd->gov` reassigned to the dangling `default_gov`. Fix the UAF by clearing `default_gov` if it matches the governor being unregistered.
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存在安全漏洞，该漏洞源于watchdog pretimeout组件在watchdog_unregister_governor()函数中取消注册看门狗管理器时未正确清除default_gov，导致释放后重用。
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 da0d12ff2b829a35e9921918e925d79497b82bef ~ b9ae33faa96bdec6bc60e4c5f8f53786182e4207 -
Linux Linux 4.9 -

II. Public POCs for CVE-2026-68357

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III. Intelligence Information for CVE-2026-68357

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Patches & Fixes for CVE-2026-68357 (7)

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

CVE-2026-68117 9.8 CRITICAL tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
CVE-2026-68161 9.8 CRITICAL sctp: close UDP tunnel sockets during netns teardown
CVE-2026-68160 9.8 CRITICAL ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
CVE-2026-68123 9.8 CRITICAL openvswitch: fix GSO userspace truncation underflow
CVE-2026-68302 9.8 CRITICAL amt: re-read skb header pointers after every pull
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-2026-68159 9.8 CRITICAL libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE
CVE-2026-68127 9.8 CRITICAL ila: reload IPv6 header after pskb_may_pull in checksum adjust
CVE-2026-68388 9.8 CRITICAL smb/client: handle overlapping allocated ranges in fallocate
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-2026-68136 9.8 CRITICAL net: gro: fix double aggregation of flush-marked skbs
CVE-2026-68170 9.8 CRITICAL mptcp: fix stale skb->sk reference on subflow close
CVE-2026-68426 9.8 CRITICAL xfrm: fix stale skb->prev after async crypto steals a GSO segment
CVE-2026-68156 9.8 CRITICAL libceph: refresh auth->authorizer_buf{,_len} after authorizer update
CVE-2026-68158 9.8 CRITICAL libceph: Fix multiplication overflow in decode_new_up_state_weight()
CVE-2026-68300 9.8 CRITICAL sctp: auth: verify auth requirement when auth_chunk is NULL
CVE-2026-68154 9.8 CRITICAL libceph: reject zero bucket types in crush_decode
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-2026-68357

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