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CVE-2026-46173— exit: prevent preemption of oopsing TASK_DEAD task

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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于exit中oopsing TASK_DEAD任务可被抢占，可能导致释放后重用或双重释放。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 7f80a2fd7db9a55894fd841915236aca611291b5< 3d6fb8a7690c23e3213c4b008f64d89a44b98737 affected
7f80a2fd7db9a55894fd841915236aca611291b5< 640b4c00fb0e2920327435f6176cbefc3c546165 affected
7f80a2fd7db9a55894fd841915236aca611291b5< 7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34 affected
7f80a2fd7db9a55894fd841915236aca611291b5< 6f49f94f3b11fe8bff1bf2a054143789e76aaf17 affected
7f80a2fd7db9a55894fd841915236aca611291b5< 9756b3db5db6c2f5eccb32dddbd88eb4c54f575e affected
7f80a2fd7db9a55894fd841915236aca611291b5< c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891 affected
5.17 affected
< 5.17 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-46173

Vulnerability Information
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Vulnerability Title
exit: prevent preemption of oopsing TASK_DEAD task
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: exit: prevent preemption of oopsing TASK_DEAD task When an already-exiting task oopses, make_task_dead() currently calls do_task_dead() with preemption enabled. That is forbidden: do_task_dead() calls __schedule(), which has a comment saying "WARNING: must be called with preemption disabled!". If an oopsing task is preempted in do_task_dead(), between becoming TASK_DEAD and entering the scheduler explicitly, bad things happen: finish_task_switch() assumes that once the scheduler has switched away from a TASK_DEAD task, the task can never run again and its stack is no longer needed; but that assumption apparently doesn't hold if the dead task was preempted (the SM_PREEMPT case). This means that the scheduler ends up repeatedly dropping references on the dead task's stack, which can lead to use-after-free or double-free of the entire task stack; in other words, two tasks can end up running on the same stack, resulting in various kinds of memory corruption. (This does not just affect "recursively oopsing" tasks; it is enough to oops once during task exit, for example in a file_operations::release handler)
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于exit中oopsing TASK_DEAD任务可被抢占，可能导致释放后重用或双重释放。
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 7f80a2fd7db9a55894fd841915236aca611291b5 ~ 3d6fb8a7690c23e3213c4b008f64d89a44b98737 -
Linux Linux 5.17 -

II. Public POCs for CVE-2026-46173

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III. Intelligence Information for CVE-2026-46173

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Patches & Fixes for CVE-2026-46173 (6)

Vendor Advisories for CVE-2026-46173 (1)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
CVE-2026-46119 9.1 CRITICAL libceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle
CVE-2026-46201 7.8 HIGH drm/xe: Fix dma-buf attachment leak in xe_gem_prime_import()
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46173

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