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PatchSiren cyber security CVE debrief

CVE-2026-53382 Linux CVE debrief

A general protection fault in the Linux kernel's media test driver, vidtv, was reported. The issue arises from a NULL pointer dereference in the vidtv_mux_push_si function. This occurs when vidtv_mux_get_pid_ctx returns NULL, and the returned pointer is dereferenced to access the continuity counter. 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 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. This highlights the need for thorough error checking in kernel code to prevent such issues.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-07-19
Advisory published
2026-07-19
Advisory updated
2026-07-19

Who should care

Users of the Linux kernel with the media test driver, vidtv, enabled should be aware of this vulnerability and take steps to ensure their systems are updated. This includes system administrators, security teams, and developers working with the Linux kernel. They should review the Linux kernel advisories and apply necessary patches or mitigations.

Technical summary

The Linux kernel's media test driver, vidtv, is vulnerable to a NULL pointer dereference. The vidtv_mux_push_si function does not check if vidtv_mux_get_pid_ctx returns NULL before dereferencing the pointer. This can lead to a general protection fault when accessing a near-NULL address. The issue is caused by vidtv_mux_pid_ctx_init not checking the return value of vidtv_mux_create_pid_ctx_once for PMT section PIDs. To fix this, both the root cause (add error check in vidtv_mux_pid_ctx_init for PMT PIDs) and the immediate issue (add defensive NULL checks in vidtv_mux_push_si) need to be addressed.

Defensive priority

High

Recommended defensive actions

  • Update the Linux kernel to the latest version
  • Ensure the media test driver, vidtv, is disabled or updated
  • Monitor system logs for potential crashes or errors
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-19T12:16:48.970Z and has not been modified since then. The NVD entry is currently Received. There is no additional information available about the vulnerability beyond what is provided in the CVE record and NVD entry. Users should verify the information with the Linux kernel maintainers or other trusted sources for further details.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-19T12:16:48.970Z and has not been modified since then.