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CVE-2026-46274— io-wq: check that the predecessor is hashed in io_wq_remove_pending()

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io-wq中io_wq_remove_pending函数未检查前驱是否已哈希，可能导致空指针取消引用。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 204361a77f4018627addd4a06877448f088ddfc0< d6bda9df0c0a3080804181464d5c0f4d78a4e769 affected
204361a77f4018627addd4a06877448f088ddfc0< 5a20ebf0c81b61f5ea3b1b529c100cad69b9f603 affected
204361a77f4018627addd4a06877448f088ddfc0< 252c5051dba9c709b6a72f2866f93e5e618b3f06 affected
204361a77f4018627addd4a06877448f088ddfc0< d376c131af7c7739a87ff037ed2fdb67c2542c8a affected
204361a77f4018627addd4a06877448f088ddfc0< d6a2d7b04b5a093021a7a0e2e69e9d5237dfa8cc affected
13f35a2c0fd5c6a4fcd8903542b053bcc914fcf5 affected
5.8.6< 5.9 affected
5.9 affected
… +6 more rows
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I. Basic Information for CVE-2026-46274

Vulnerability Information
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Vulnerability Title
io-wq: check that the predecessor is hashed in io_wq_remove_pending()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io-wq: check that the predecessor is hashed in io_wq_remove_pending() io_wq_remove_pending() needs to fix up wq->hash_tail[] if the cancelled work was the tail of its hash bucket. When doing this, it checks whether the preceding entry in acct->work_list has the same hash value, but never checks that the predecessor is hashed at all. io_get_work_hash() is simply atomic_read(&work->flags) >> IO_WQ_HASH_SHIFT, and the hash bits are never set for non-hashed work, so it returns 0. Thus, when a hashed bucket-0 work is cancelled while a non-hashed work is its list predecessor, the check spuriously passes and a pointer to the non-hashed io_kiocb is stored in wq->hash_tail[0]. Because non-hashed work is dequeued via the fast path in io_get_next_work(), which never touches hash_tail[], the stale pointer is never cleared. Therefore, after the non-hashed io_kiocb completes and is freed back to req_cachep, wq->hash_tail[0] is a dangling pointer. The io_wq is per-task (tctx->io_wq) and survives ring open/close, so the dangling pointer persists for the lifetime of the task; the next hashed bucket-0 enqueue dereferences it in io_wq_insert_work() and wq_list_add_after() writes through freed memory. Add the missing io_wq_is_hashed() check so a non-hashed predecessor never inherits a hash_tail[] slot.
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io-wq中io_wq_remove_pending函数未检查前驱是否已哈希，可能导致空指针取消引用。
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 204361a77f4018627addd4a06877448f088ddfc0 ~ d6bda9df0c0a3080804181464d5c0f4d78a4e769 -
Linux Linux 5.9 -

II. Public POCs for CVE-2026-46274

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III. Intelligence Information for CVE-2026-46274

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Patches & Fixes for CVE-2026-46274 (5)

Same Patch Batch · Linux · 2026-06-08 · 41 CVEs total

CVE-2026-46289 9.8 CRITICAL lib/scatterlist: fix length calculations in extract_kvec_to_sg
CVE-2026-46288 8.4 HIGH of: unittest: fix use-after-free in of_unittest_changeset()
CVE-2026-46307 8.3 HIGH wifi: ath5k: do not access array OOB
CVE-2026-46303 8.2 HIGH isofs: validate Rock Ridge CE continuation extent against volume size
CVE-2026-46275 7.8 HIGH Bluetooth: hci_uart: fix UAFs and race conditions in close and init paths
CVE-2026-46311 7.8 HIGH drm/amdgpu/userq: fix access to stale wptr mapping
CVE-2026-46280 7.8 HIGH lib: test_hmm: evict device pages on file close to avoid use-after-free
CVE-2026-46277 7.8 HIGH mm/zone_device: do not touch device folio after calling ->folio_free()
CVE-2026-46306 7.5 HIGH flow_dissector: do not dissect PPPoE PFC frames
CVE-2026-46304 7.5 HIGH nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free
CVE-2026-46299 7.0 HIGH hfsplus: fix held lock freed on hfsplus_fill_super()
CVE-2026-46296 spi: s3c64xx: fix NULL-deref on driver unbind
CVE-2026-46298 pseries/papr-hvpipe: Fix race with interrupt handler
CVE-2026-46301 spi: topcliff-pch: fix use-after-free on unbind
CVE-2026-46302 selinux: allow multiple opens of /sys/fs/selinux/policy
CVE-2026-46314 drm/v3d: Reject empty multisync extension to prevent infinite loop
CVE-2025-71315 drm/vkms: Convert to DRM's vblank timer
CVE-2026-46305 staging: rtl8723bs: os_dep: avoid NULL pointer dereference in rtw_cbuf_alloc
CVE-2026-46313 media: intel/ipu6: fix error pointer dereference
CVE-2026-46308 pmdomain: mediatek: fix use-after-free in scpsys_get_bus_protection_legacy()

Showing top 20 of 41 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46274

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