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CVE-2025-21863— io_uring: prevent opcode speculation

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，该漏洞源于未对操作码进行清理，可能导致推测执行攻击。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux d3656344fea0339fb0365c8df4d2beba4e0089cd< 87e9eef43c758da267f6332678058a79764c7eba affected
d3656344fea0339fb0365c8df4d2beba4e0089cd< 18eae8420081ef8e043ad455937bfb470ef08607 affected
d3656344fea0339fb0365c8df4d2beba4e0089cd< d261ead565a080e3411b0dd04e6d58a52471cac8 affected
d3656344fea0339fb0365c8df4d2beba4e0089cd< b9826e3b26ec031e9063f64a7c735449c43955e4 affected
d3656344fea0339fb0365c8df4d2beba4e0089cd< 506b9b5e8c2d2a411ea8fe361333f5081c56d23a affected
d3656344fea0339fb0365c8df4d2beba4e0089cd< fdbfd52bd8b85ed6783365ff54c82ab7067bd61b affected
d3656344fea0339fb0365c8df4d2beba4e0089cd< 1e988c3fe1264708f4f92109203ac5b1d65de50b affected
5.6 affected
… +8 more rows
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I. Basic Information for CVE-2025-21863

Vulnerability Information
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Vulnerability Title
io_uring: prevent opcode speculation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: prevent opcode speculation sqe->opcode is used for different tables, make sure we santitise it against speculations.
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，该漏洞源于未对操作码进行清理，可能导致推测执行攻击。
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 d3656344fea0339fb0365c8df4d2beba4e0089cd ~ 87e9eef43c758da267f6332678058a79764c7eba -
Linux Linux 5.6 -

II. Public POCs for CVE-2025-21863

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III. Intelligence Information for CVE-2025-21863

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Patches & Fixes for CVE-2025-21863 (2)

Other References for CVE-2025-21863 (3)

Same Patch Batch · Linux · 2025-03-12 · 26 CVEs total

CVE-2024-58087 9.8 CRITICAL ksmbd: fix racy issue from session lookup and expire
CVE-2025-21850 9.8 CRITICAL nvmet: Fix crash when a namespace is disabled
CVE-2025-21855 8.6 HIGH ibmvnic: Don't reference skb after sending to VIOS
CVE-2025-21864 7.8 HIGH tcp: drop secpath at the same time as we currently drop dst
CVE-2024-58089 7.8 HIGH btrfs: fix double accounting race when btrfs_run_delalloc_range() failed
CVE-2025-21858 7.8 HIGH geneve: Fix use-after-free in geneve_find_dev().
CVE-2025-21851 7.8 HIGH bpf: Fix softlockup in arena_map_free on 64k page kernel
CVE-2025-21844 7.5 HIGH smb: client: Add check for next_buffer in receive_encrypted_standard()
CVE-2025-21853 bpf: avoid holding freeze_mutex during mmap operation
CVE-2024-58088 bpf: Fix deadlock when freeing cgroup storage
CVE-2025-21845 mtd: spi-nor: sst: Fix SST write failure
CVE-2025-21846 acct: perform last write from workqueue
CVE-2025-21848 nfp: bpf: Add check for nfp_app_ctrl_msg_alloc()
CVE-2025-21847 ASoC: SOF: stream-ipc: Check for cstream nullity in sof_ipc_msg_data()
CVE-2025-21849 drm/i915/gt: Use spin_lock_irqsave() in interruptible context
CVE-2025-21852 net: Add rx_skb of kfree_skb to raw_tp_null_args[].
CVE-2025-21866 powerpc/code-patching: Fix KASAN hit by not flagging text patching area as VM_ALLOC
CVE-2025-21854 sockmap, vsock: For connectible sockets allow only connected
CVE-2025-21856 s390/ism: add release function for struct device
CVE-2025-21857 net/sched: cls_api: fix error handling causing NULL dereference

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21863

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