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CVE-2026-52933— io_uring/poll: fix signed comparison in io_poll_get_ownership()

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_poll_get_ownership中符号比较逻辑错误，当poll_refs设置了IO_POLL_CANCEL_FLAG时，有符号整数比较始终为假，导致慢路径永远不会被触发，使得取消标志被忽略。以下版本受到影响：5.15.82版本至5.16之前版本、6.0.11版本至6.1之前版本和6.1版本。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea< 81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 affected
a26a35e9019fd70bf3cf647dcfdae87abc7bacea< cf522703d4f194991615763697ae25a3f9539763 affected
a26a35e9019fd70bf3cf647dcfdae87abc7bacea< fc47043f3d9af3efa407665b47f8378ec691ba18 affected
a26a35e9019fd70bf3cf647dcfdae87abc7bacea< ea0697129807d718037f618221037aa0660ee3c5 affected
a26a35e9019fd70bf3cf647dcfdae87abc7bacea< c6d191164dc81838d8dbf452a6000f68c558d1ae affected
a26a35e9019fd70bf3cf647dcfdae87abc7bacea< 326941b22806cbf2df1fbfe902b7908b368cce42 affected
4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048 affected
bc4e6ee16778149811333a969a7a893d4cc110c5 affected
… +10 more rows
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I. Basic Information for CVE-2026-52933

Vulnerability Information
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Vulnerability Title
io_uring/poll: fix signed comparison in io_poll_get_ownership()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: fix signed comparison in io_poll_get_ownership() io_poll_get_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS)) atomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG (BIT(31)) is set in poll_refs, the value becomes negative in signed arithmetic, so the >= 128 comparison always evaluates to false and the slowpath is never taken. Fix this by casting the atomic_read() result to unsigned int before the comparison, so that the cancel flag is treated as a large positive value and correctly triggers the slowpath.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于io_poll_get_ownership中符号比较逻辑错误，当poll_refs设置了IO_POLL_CANCEL_FLAG时，有符号整数比较始终为假，导致慢路径永远不会被触发，使得取消标志被忽略。以下版本受到影响：5.15.82版本至5.16之前版本、6.0.11版本至6.1之前版本和6.1版本。
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 a26a35e9019fd70bf3cf647dcfdae87abc7bacea ~ 81bf96b0abbfa4cd47ea32e12596aed3855fb2f3 -
Linux Linux 6.1 -

II. Public POCs for CVE-2026-52933

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III. Intelligence Information for CVE-2026-52933

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Patches & Fixes for CVE-2026-52933 (6)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52933

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