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CVE-2026-31405— media: dvb-net: fix OOB access in ULE extension header tables

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，该漏洞源于未验证扩展头类型索引，可能导致越界读取和函数指针调用。

CVSS 9.8 · Critical EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e51238718217c4abdb3ccc3b0c0cde265c7ec629 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b2bd2ee73b697c177157bba534e1b1064c2e66a0 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 29ef43ceb121d67b87f4cbb08439e4e9e732eff8 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1a6da3dbb9985d00743073a1cc1f96e59f5abc30 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 145e50c2c700fa52b840df7bab206043997dd18e affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f2b65dcb78c8990e4c68a906627433be1fe38a92 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 24d87712727a5017ad142d63940589a36cd25647 affected
… +10 more rows
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I. Basic Information for CVE-2026-31405

Vulnerability Information
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Vulnerability Title
media: dvb-net: fix OOB access in ULE extension header tables
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: media: dvb-net: fix OOB access in ULE extension header tables The ule_mandatory_ext_handlers[] and ule_optional_ext_handlers[] tables in handle_one_ule_extension() are declared with 255 elements (valid indices 0-254), but the index htype is derived from network-controlled data as (ule_sndu_type & 0x00FF), giving a range of 0-255. When htype equals 255, an out-of-bounds read occurs on the function pointer table, and the OOB value may be called as a function pointer. Add a bounds check on htype against the array size before either table is accessed. Out-of-range values now cause the SNDU to be discarded.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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，该漏洞源于未验证扩展头类型索引，可能导致越界读取和函数指针调用。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ e51238718217c4abdb3ccc3b0c0cde265c7ec629 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-31405

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III. Intelligence Information for CVE-2026-31405

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Same Patch Batch · Linux · 2026-04-06 · 6 CVEs total

CVE-2026-31408 8.8 HIGH Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
CVE-2026-31409 8.8 HIGH ksmbd: unset conn->binding on failed binding request
CVE-2026-31406 7.8 HIGH xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
CVE-2026-31407 7.1 HIGH netfilter: conntrack: add missing netlink policy validations
CVE-2026-31410 ksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31405

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