CVE-2026-53382
Received Received - Intake

NULL Pointer Dereference in Linux Kernel vidtv Driver

Publication date: 2026-07-19

Last updated on: 2026-07-19

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: media: vidtv: fix NULL pointer dereference in vidtv_mux_push_si syzbot reported a general protection fault in vidtv_psi_ts_psi_write_into [1]. vidtv_mux_get_pid_ctx() can return NULL, but vidtv_mux_push_si() does not check for this before dereferencing the returned pointer to access the continuity counter. This leads to a general protection fault when accessing a near-NULL address. The root cause is that vidtv_mux_pid_ctx_init() does not check the return value of vidtv_mux_create_pid_ctx_once() for PMT section PIDs. If the allocation fails, the PID context is never created, but init returns success. The subsequent vidtv_mux_push_si() call then gets NULL from vidtv_mux_get_pid_ctx() and crashes. Fix both the root cause (add error check in vidtv_mux_pid_ctx_init for PMT PIDs) and add defensive NULL checks in vidtv_mux_push_si for all vidtv_mux_get_pid_ctx() calls. [1] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Workqueue: events vidtv_mux_tick RIP: 0010:vidtv_psi_ts_psi_write_into+0x54a/0xbc0 drivers/media/test-drivers/vidtv/vidtv_psi.c:197 Call Trace: <TASK> vidtv_psi_table_header_write_into drivers/media/test-drivers/vidtv/vidtv_psi.c:799 [inline] vidtv_psi_pmt_write_into+0x3b2/0xa70 drivers/media/test-drivers/vidtv/vidtv_psi.c:1231 vidtv_mux_push_si+0x932/0xe80 drivers/media/test-drivers/vidtv/vidtv_mux.c:196 vidtv_mux_tick+0xe9b/0x1480 drivers/media/test-drivers/vidtv/vidtv_mux.c:408

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Meta Information

Published
2026-07-19
Last Modified
2026-07-19
Generated
2026-07-20
AI Q&A
2026-07-19
EPSS Evaluated
N/A
NVD
CVE-2026-53382
EUVD
EUVD-2026-45504

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a NULL pointer dereference vulnerability in the Linux kernel's media subsystem, specifically in the vidtv driver. It occurs when vidtv_mux_push_si() tries to access a memory address through a pointer that is NULL, causing a general protection fault. The root cause is that vidtv_mux_pid_ctx_init() fails to check if memory allocation for PMT section PIDs succeeds, leading to an invalid pointer being used later.

Detection Guidance

This vulnerability is specific to the Linux kernel's vidtv media driver and may not have direct network detection methods. Check kernel logs for general protection faults or NULL pointer dereference errors related to vidtv modules using: dmesg | grep -i 'vidtv' or dmesg | grep -i 'general protection fault'.

Impact Analysis

If you use a Linux system with the vulnerable vidtv driver, this flaw could cause kernel crashes (general protection faults) when processing certain media streams. This may lead to system instability, denial of service, or potential privilege escalation if exploited maliciously.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a Linux kernel media driver issue causing a NULL pointer dereference in the vidtv module. It may indirectly impact systems processing media data if exploited, but no evidence suggests it involves data privacy or security controls relevant to these regulations.

Mitigation Strategies

Apply the latest kernel patches or updates that include the fix for CVE-2026-53382. If you are using a custom or test kernel with the vidtv driver, disable the vidtv module if not needed using: sudo rmmod vidtv_mux or sudo rmmod vidtv_psi.

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