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Vulnerability record · CVE-2026-31405 · published 6 April 2026

CVE-2026-31405: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.76% · top 46.7% CWE-125 · Out-of-bounds read
9.8CVSS 3.1 base score
0.76%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
24 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/145e50c2c700fa52b840df7bab206043997dd18e Patch
https://git.kernel.org/stable/c/1a6da3dbb9985d00743073a1cc1f96e59f5abc30 Patch
https://git.kernel.org/stable/c/24d87712727a5017ad142d63940589a36cd25647 Patch
https://git.kernel.org/stable/c/29ef43ceb121d67b87f4cbb08439e4e9e732eff8 Patch
https://git.kernel.org/stable/c/8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe Patch
https://git.kernel.org/stable/c/b2bd2ee73b697c177157bba534e1b1064c2e66a0 Patch
https://git.kernel.org/stable/c/e51238718217c4abdb3ccc3b0c0cde265c7ec629 Patch
https://git.kernel.org/stable/c/f2b65dcb78c8990e4c68a906627433be1fe38a92 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31405), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.