UBUNTU-CVE-2026-53382: Null Pointer Dereference
In the Linux kernel, the following vulnerability has been resolved: media: vidtv: fix NULL pointer dereference in vidtvmuxpushsi syzbot reported a general protection fault in vidtvpsitspsiwriteinto [1]. vidtvmuxgetpidctx() can return NULL, but vidtvmuxpushsi() 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 vidtvmuxpidctxinit() does not check the return value of vidtvmuxcreatepidctxonce() for PMT section PIDs. If the allocation fails, the PID context is never created, but init returns success. The subsequent vidtvmuxpushsi() call then gets NULL from vidtvmuxgetpidctx() and crashes. Fix both the root cause (add error check in vidtvmuxpidctxinit for PMT PIDs) and add defensive NULL checks in vidtvmuxpushsi for all vidtvmuxgetpidctx() 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 vidtvmuxtick RIP: 0010:vidtvpsitspsiwriteinto+0x54a/0xbc0 drivers/media/test-drivers/vidtv/vidtvpsi.c:197 Call Trace: <TASK> vidtvpsitableheaderwriteinto drivers/media/test-drivers/vidtv/vidtvpsi.c:799 [inline] vidtvpsipmtwriteinto+0x3b2/0xa70 drivers/media/test-drivers/vidtv/vidtvpsi.c:1231 vidtvmuxpushsi+0x932/0xe80 drivers/media/test-drivers/vidtv/vidtvmux.c:196 vidtvmuxtick+0xe9b/0x1480 drivers/media/test-drivers/vidtv/vidtvmux.c:408
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linux-aws-5.15to a version that resolves this vulnerability.Fixed in 5.15.0-1117.124~20.04.1 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-31.31.1 - Compensating control
Update vidtv_mux_pid_ctx_init() to check the return value of vidtv_mux_create_pid_ctx_once() for PMT section PIDs and report allocation failure instead of returning success; add NULL checks in vidtv_mux_push_si() for every vidtv_mux_get_pid_ctx() call before dereferencing the returned PID context or its continuity counter.
Event History
Frequently Asked Questions
What conditions are needed to trigger the crash?
The failure occurs when creation of a PID context for a PMT section PID fails, such as due to an allocation failure, and later processing calls vidtv_mux_push_si(). The unchecked missing context is then dereferenced, causing a kernel general protection fault.
What is the practical impact of successful exploitation?
The provided severity vector indicates local access, low attack complexity, and low privileges required, with no user interaction. The stated impact is availability only: the NULL pointer dereference can crash the kernel path handling the vidtv media driver.
Which Ubuntu kernel packages are listed as affected by this advisory?
The advisory lists ubuntu/linux, ubuntu/linux-realtime, ubuntu/linux-azure, ubuntu/linux-gcp, ubuntu/linux-azure-fde, ubuntu/linux-gke, ubuntu/linux-riscv, and ubuntu/linux-gkeop.