media: vidtv: fix NULL pointer dereference in vidtv_mux_push_si

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53382
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:48 UTC
Updated2026-07-19 12:16:48 UTC
DescriptionIn 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

Risk And Classification

EPSS: 0.001950000 probability, percentile 0.094670000 (date 2026-07-20)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 455bc12e7b73ab5a2dfcb47822e91e772bc6c42e git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 f0f5a1d7056980a0d512456fdb370cfb72bba86a git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 6df7e16d4f742c80add58995a6e69385b97aa9e6 git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 cd923dadefadb9671b5ac341b672ff424d429c39 git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 353d9578951dd38bc9679308f5b618ceed1f20fa git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 f965cf22dda7f512f4922415894c3e528269a4ae git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 b28b12be6e8910489e6800ed93ea4d41dfe19683 git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 232e4b313ea342672edf8947e067c0de4328405b git Not specified
CNA Linux Linux affected f90cf6079bf67988f8b1ad1ade70fc89d0080905 7d8bf3d8f91073f4db347ed3aa6302b56107499c git Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.37 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.14 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1.2 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/353d9578951dd38bc9679308f5b618ceed1f20fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7d8bf3d8f91073f4db347ed3aa6302b56107499c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/455bc12e7b73ab5a2dfcb47822e91e772bc6c42e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6df7e16d4f742c80add58995a6e69385b97aa9e6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/232e4b313ea342672edf8947e067c0de4328405b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0f5a1d7056980a0d512456fdb370cfb72bba86a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b28b12be6e8910489e6800ed93ea4d41dfe19683 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f965cf22dda7f512f4922415894c3e528269a4ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cd923dadefadb9671b5ac341b672ff424d429c39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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