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CVE-2026-31781— drm/ioc32: stop speculation on the drm_compat_ioctl path

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drm兼容ioctl路径中未对用户控制指针进行边界检查，可能导致推测执行攻击。

AI Predicted 5.6 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux 505b5240329b922f21f91d5b5d1e535c805eca6d< 46a60ee8956ef1975f00455f614761c7ecedc09d affected
505b5240329b922f21f91d5b5d1e535c805eca6d< 5bb398991f378ef74d90b14a6ea8b61ff96cc03a affected
505b5240329b922f21f91d5b5d1e535c805eca6d< d59c5d8539662d95887b4564f3f72ad38076a2d5 affected
505b5240329b922f21f91d5b5d1e535c805eca6d< 489f2ef2b908898d01df697dc4fe1476674be640 affected
505b5240329b922f21f91d5b5d1e535c805eca6d< 4a41c2b18fc05d30b718d2602cac339eae710b34 affected
505b5240329b922f21f91d5b5d1e535c805eca6d< f0e441be08a2eab10b2d06fccfa267ee599dd6b3 affected
505b5240329b922f21f91d5b5d1e535c805eca6d< 27ef84bba9b9d7b03418c60fbc6069ea0e87b13c affected
505b5240329b922f21f91d5b5d1e535c805eca6d< f8995c2df519f382525ca4bc90553ad2ec611067 affected
… +20 more rows
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I. Basic Information for CVE-2026-31781

Vulnerability Information
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Vulnerability Title
drm/ioc32: stop speculation on the drm_compat_ioctl path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/ioc32: stop speculation on the drm_compat_ioctl path The drm compat ioctl path takes a user controlled pointer, and then dereferences it into a table of function pointers, the signature method of spectre problems. Fix this up by calling array_index_nospec() on the index to the function pointer list.
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drm兼容ioctl路径中未对用户控制指针进行边界检查，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 505b5240329b922f21f91d5b5d1e535c805eca6d ~ 46a60ee8956ef1975f00455f614761c7ecedc09d -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-31781

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III. Intelligence Information for CVE-2026-31781

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Patches & Fixes for CVE-2026-31781 (8)

Same Patch Batch · Linux · 2026-05-01 · 146 CVEs total

CVE-2026-43011 9.8 CRITICAL net/x25: Fix potential double free of skb
CVE-2026-43037 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip4ip6_err()
CVE-2026-31705 9.8 CRITICAL ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment
CVE-2026-43038 9.8 CRITICAL ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
CVE-2026-43039 9.8 CRITICAL net: ti: icssg-prueth: fix missing data copy and wrong recycle in ZC RX dispatch
CVE-2026-31718 9.8 CRITICAL ksmbd: fix use-after-free in __ksmbd_close_fd() via durable scavenger
CVE-2026-43018 8.8 HIGH Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt
CVE-2026-31773 8.8 HIGH Bluetooth: SMP: derive legacy responder STK authentication from MITM state
CVE-2026-31739 8.8 HIGH crypto: tegra - Add missing CRYPTO_ALG_ASYNC
CVE-2026-31735 8.8 HIGH iommupt: Fix short gather if the unmap goes into a large mapping
CVE-2026-31717 8.8 HIGH ksmbd: validate owner of durable handle on reconnect
CVE-2026-43048 8.8 HIGH HID: core: Mitigate potential OOB by removing bogus memset()
CVE-2026-31709 8.8 HIGH smb: client: validate the whole DACL before rewriting it in cifsacl
CVE-2026-31706 8.8 HIGH ksmbd: validate num_aces and harden ACE walk in smb_inherit_dacl()
CVE-2026-31712 8.3 HIGH ksmbd: require minimum ACE size in smb_check_perm_dacl()
CVE-2026-31771 8.1 HIGH Bluetooth: hci_event: move wake reason storage into validated event handlers
CVE-2026-31779 8.1 HIGH wifi: iwlwifi: mvm: fix potential out-of-bounds read in iwl_mvm_nd_match_info_handler()
CVE-2026-43051 8.1 HIGH HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq
CVE-2026-31708 8.1 HIGH smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path
CVE-2026-31695 7.8 HIGH wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31781

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