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Linux Kernel CVE-2026-31599

| EUVDEUVD-2026-25492 MEDIUM
NULL Pointer Dereference (CWE-476)
2026-04-24 Linux GHSA-x6jh-jrg5-6v49
Denial Of Service Linux Null Pointer Dereference Canonical
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

Local-only vector, low privilege to access DVB device, pure availability impact via kernel crash; no confidentiality or integrity consequence.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

6
Analysis Generated
Jul 24, 2026 - 02:56 vuln.today
CVSS changed
Apr 29, 2026 - 20:22 NVD
5.5 (MEDIUM)
Patch released
Apr 29, 2026 - 20:12 nvd
Patch available
Patch available
Apr 24, 2026 - 16:16 EUVD
EUVD ID Assigned
Apr 24, 2026 - 15:00 euvd
EUVD-2026-25492
CVE Published
Apr 24, 2026 - 14:42 nvd
MEDIUM 5.5

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

media: vidtv: fix NULL pointer dereference in vidtv_channel_pmt_match_sections

syzbot reported a general protection fault in vidtv_psi_desc_assign [1].

vidtv_psi_pmt_stream_init() can return NULL on memory allocation failure, but vidtv_channel_pmt_match_sections() does not check for this. When tail is NULL, the subsequent call to vidtv_psi_desc_assign(&tail->descriptor, desc) dereferences a NULL pointer offset, causing a general protection fault.

Add a NULL check after vidtv_psi_pmt_stream_init(). On failure, clean up the already-allocated stream chain and return.

[1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:vidtv_psi_desc_assign+0x24/0x90 drivers/media/test-drivers/vidtv/vidtv_psi.c:629 Call Trace: <TASK> vidtv_channel_pmt_match_sections drivers/media/test-drivers/vidtv/vidtv_channel.c:349 [inline] vidtv_channel_si_init+0x1445/0x1a50 drivers/media/test-drivers/vidtv/vidtv_channel.c:479 vidtv_mux_init+0x526/0xbe0 drivers/media/test-drivers/vidtv/vidtv_mux.c:519 vidtv_start_streaming drivers/media/test-drivers/vidtv/vidtv_bridge.c:194 [inline] vidtv_start_feed+0x33e/0x4d0 drivers/media/test-drivers/vidtv/vidtv_bridge.c:239

AnalysisAI

NULL pointer dereference in the Linux kernel's vidtv virtual DVB-T test driver allows a local low-privileged user to crash the kernel, resulting in a denial-of-service. The flaw resides in vidtv_channel_pmt_match_sections(), which calls vidtv_psi_pmt_stream_init() without validating whether the return value is NULL on memory allocation failure; a subsequent field access on the NULL pointer triggers a general protection fault. No public exploit or active KEV-listed exploitation exists; EPSS at 0.02% (5th percentile) reflects negligible real-world exploitation probability.

Technical ContextAI

The affected code is in drivers/media/test-drivers/vidtv/, a virtual DVB-T (Digital Video Broadcasting - Terrestrial) test driver introduced to allow DVB subsystem testing without physical hardware. It implements PSI (Program Specific Information) table construction, including PMT (Program Map Table) streams. The root cause (CWE-476) is an unchecked return value: vidtv_psi_pmt_stream_init() returns NULL on kmalloc failure, and vidtv_channel_pmt_match_sections() immediately dereferences the result via &tail->descriptor, triggering a KASAN-detected null-ptr-deref at offset 0x00-0x07. The CPE cpe:2.3:a:linux:linux confirms this affects the mainline Linux kernel codebase. The call chain is: vidtv_start_feed → vidtv_start_streaming → vidtv_mux_init → vidtv_channel_si_init → vidtv_channel_pmt_match_sections → vidtv_psi_desc_assign (crash site at vidtv_psi.c:629). The fix adds a NULL check with cleanup of the already-allocated stream chain before returning.

RemediationAI

Upgrade to a patched stable kernel release: 6.12.83 or later in the 6.12 series, 6.18.24 or later in the 6.18 series, 6.19.14 or later in the 6.19 series, or 7.0.1 or later in the 7.0 series. Fixes are available from the kernel stable tree at https://git.kernel.org/stable/c/e589de36da106ef739ba98f66f5a5c2023370706 and sibling commits. Ubuntu users should apply USN-8488-1 via standard package updates (https://ubuntu.com/security/notices/USN-8488-1). As a compensating control on systems that cannot immediately patch, unload or blacklist the vidtv module (echo 'blacklist vidtv' >> /etc/modprobe.d/blacklist.conf) - this eliminates the attack surface entirely with no functional impact on production workloads since vidtv is a test-only driver. Server and production kernels built without CONFIG_DVB_VIDTV are not affected and require no action.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-31599 vulnerability details – vuln.today
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