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CVE-2026-31483— s390/syscalls: Add spectre boundary for syscall dispatch table

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，该漏洞源于系统调用分派表缺少边界检查，可能导致用户空间控制的系统调用号越界访问。

AI Predicted 7.8 Difficulty: Hard EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 56e62a73702836017564eaacd5212e4d0fa1c01d< 3c3b97064764899c39a0abbd35a6caa031e70333 affected
56e62a73702836017564eaacd5212e4d0fa1c01d< 1cb9c7bc9025c637564fabc7fcc3c9343949e310 affected
56e62a73702836017564eaacd5212e4d0fa1c01d< 7a5260fbc6e79a1595328ec5c6aa3f937504a1f0 affected
56e62a73702836017564eaacd5212e4d0fa1c01d< f8c444b918d639e1f9a621ee20fe481c1d10dfc4 affected
56e62a73702836017564eaacd5212e4d0fa1c01d< 87776f02449e3bded95b2ccbd6b012e9ae64e6f3 affected
56e62a73702836017564eaacd5212e4d0fa1c01d< 4d05dd18d867d58c6952a3bc260d244899da7256 affected
56e62a73702836017564eaacd5212e4d0fa1c01d< 48b8814e25d073dd84daf990a879a820bad2bcbd affected
5.12 affected
… +8 more rows
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I. Basic Information for CVE-2026-31483

Vulnerability Information
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Vulnerability Title
s390/syscalls: Add spectre boundary for syscall dispatch table
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/syscalls: Add spectre boundary for syscall dispatch table The s390 syscall number is directly controlled by userspace, but does not have an array_index_nospec() boundary to prevent access past the syscall function pointer tables.
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，该漏洞源于系统调用分派表缺少边界检查，可能导致用户空间控制的系统调用号越界访问。
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 56e62a73702836017564eaacd5212e4d0fa1c01d ~ 3c3b97064764899c39a0abbd35a6caa031e70333 -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-31483

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III. Intelligence Information for CVE-2026-31483

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-31463 9.8 CRITICAL iomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-31444 9.8 CRITICAL ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-31436 9.8 CRITICAL dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-31478 9.8 CRITICAL ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-31501 9.8 CRITICAL net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-31448 9.4 CRITICAL ext4: avoid infinite loops caused by residual data
CVE-2026-31432 8.8 HIGH ksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-31433 8.8 HIGH ksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-31450 8.8 HIGH ext4: publish jinode after initialization
CVE-2026-31435 8.8 HIGH netfs: Fix read abandonment during retry
CVE-2026-31476 8.2 HIGH ksmbd: do not expire session on binding failure
CVE-2026-31464 8.1 HIGH scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-31513 8.1 HIGH Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-31504 7.8 HIGH net: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-31449 7.8 HIGH ext4: validate p_idx bounds in ext4_ext_correct_indexes
CVE-2026-31502 7.8 HIGH team: fix header_ops type confusion with non-Ethernet ports
CVE-2026-31431 7.8 HIGH crypto: algif_aead - Revert to operating out-of-place
CVE-2026-31490 7.8 HIGH drm/xe/pf: Fix use-after-free in migration restore
CVE-2026-31479 7.8 HIGH drm/xe: always keep track of remap prev/next
CVE-2026-31494 7.8 HIGH net: macb: use the current queue number for stats

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31483

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