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CVE-2025-68808 (GCVE-0-2025-68808)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-08-05 12:11
VLAI
Title
media: vidtv: initialize local pointers upon transfer of memory ownership
Summary
In the Linux kernel, the following vulnerability has been resolved: media: vidtv: initialize local pointers upon transfer of memory ownership vidtv_channel_si_init() creates a temporary list (program, service, event) and ownership of the memory itself is transferred to the PAT/SDT/EIT tables through vidtv_psi_pat_program_assign(), vidtv_psi_sdt_service_assign(), vidtv_psi_eit_event_assign(). The problem here is that the local pointer where the memory ownership transfer was completed is not initialized to NULL. This causes the vidtv_psi_pmt_create_sec_for_each_pat_entry() function to fail, and in the flow that jumps to free_eit, the memory that was freed by vidtv_psi_*_table_destroy() can be accessed again by vidtv_psi_*_event_destroy() due to the uninitialized local pointer, so it is freed once again. Therefore, to prevent use-after-free and double-free vulnerability, local pointers must be initialized to NULL when transferring memory ownership.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < c342e294dac4988c8ada759b2f057246e48c5108 (git)
Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < 12ab6ebb37789b84073e83e4d9b14a5e0d133323 (git)
Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < 3caa18d35f1dabe85a3dd31bc387f391ac9f9b4e (git)
Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < fb9bd6d8d314b748e946ed6555eb4a956ee8c4d8 (git)
Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < a69c7fd603bf5ad93177394fbd9711922ee81032 (git)
Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < 30f4d4e5224a9e44e9ceb3956489462319d804ce (git)
Affected: 3be8037960bccd13052cfdeba8805ad785041d70 , < 98aabfe2d79f74613abc2b0b1cef08f97eaf5322 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vidtv: initialize local pointers upon transfer of memory ownership\n\nvidtv_channel_si_init() creates a temporary list (program, service, event)\nand ownership of the memory itself is transferred to the PAT/SDT/EIT\ntables through vidtv_psi_pat_program_assign(),\nvidtv_psi_sdt_service_assign(), vidtv_psi_eit_event_assign().\n\nThe problem here is that the local pointer where the memory ownership\ntransfer was completed is not initialized to NULL. This causes the\nvidtv_psi_pmt_create_sec_for_each_pat_entry() function to fail, and\nin the flow that jumps to free_eit, the memory that was freed by\nvidtv_psi_*_table_destroy() can be accessed again by\nvidtv_psi_*_event_destroy() due to the uninitialized local pointer, so it\nis freed once again.\n\nTherefore, to prevent use-after-free and double-free vulnerability,\nlocal pointers must be initialized to NULL when transferring memory\nownership."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through demux ioctls such as DMX_START on a local /dev/dvb/adapter*/demux* device; no network or physical path exists.\nAC:L - In a reasonable vidtv test/debug deployment, the attacker can deterministically target the PMT allocation using per-task fault injection or attacker-induced memory pressure, with no race or victim-controlled timing.\nPR:L - No capability checks occur along the ioctl path; an ordinary local user with the device\u0027s video-group or active-seat ACL can trigger it.\nUI:N - Once the vidtv device is present, the attacker independently opens the demux node, configures a filter, and starts the feed without victim action.\nS:U - The corruption occurs within the host kernel reached by a host process and does not cross a VM, IOMMU, or separate security-authority boundary.\nC:H - The cleanup dereferences freed list and descriptor pointers, and heap grooming can convert these UAF and double-free conditions into kernel-memory disclosure or arbitrary-read primitives.\nI:H - Repeated frees of EIT, SDT, PAT, and nested descriptor allocations can corrupt allocator freelists and support arbitrary writes or control-flow hijacking.\nA:H - The defect demonstrably causes a KASAN kernel panic, while non-instrumented kernels can likewise crash from the UAF, invalid traversal, or double-free."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-08-05T12:11:39.465Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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    "cveId": "CVE-2025-68808",
    "datePublished": "2026-01-13T15:29:15.164Z",
    "dateReserved": "2025-12-24T10:30:51.045Z",
    "dateUpdated": "2026-08-05T12:11:39.465Z",
    "state": "PUBLISHED"
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      "date": "2026-09-14",
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      "cve": "CVE-2025-68808",
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      "product_status:known_not_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "media: vidtv: initialize local pointers upon transfer of memory ownership",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2025-68808.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68808\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-13T16:16:02.967\",\"lastModified\":\"2026-07-30T06:24:46.393\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: vidtv: initialize local pointers upon transfer of memory ownership\\n\\nvidtv_channel_si_init() creates a temporary list (program, service, event)\\nand ownership of the memory itself is transferred to the PAT/SDT/EIT\\ntables through vidtv_psi_pat_program_assign(),\\nvidtv_psi_sdt_service_assign(), vidtv_psi_eit_event_assign().\\n\\nThe problem here is that the local pointer where the memory ownership\\ntransfer was completed is not initialized to NULL. This causes the\\nvidtv_psi_pmt_create_sec_for_each_pat_entry() function to fail, and\\nin the flow that jumps to free_eit, the memory that was freed by\\nvidtv_psi_*_table_destroy() can be accessed again by\\nvidtv_psi_*_event_destroy() due to the uninitialized local pointer, so it\\nis freed once again.\\n\\nTherefore, to prevent use-after-free and double-free vulnerability,\\nlocal pointers must be initialized to NULL when transferring memory\\nownership.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nmedia: vidtv: inicializar punteros locales tras la transferencia de la propiedad de la memoria\\n\\nvidtv_channel_si_init() crea una lista temporal (programa, servicio, evento) y la propiedad de la memoria misma se transfiere a las tablas PAT/SDT/EIT a trav\u00e9s de vidtv_psi_pat_program_assign(), vidtv_psi_sdt_service_assign(), vidtv_psi_eit_event_assign().\\n\\nEl problema aqu\u00ed es que el puntero local donde se complet\u00f3 la transferencia de la propiedad de la memoria no se inicializa a NULL. Esto hace que la funci\u00f3n vidtv_psi_pmt_create_sec_for_each_pat_entry() falle, y en el flujo que salta a free_eit, la memoria que fue liberada por vidtv_psi_*_table_destroy() puede ser accedida de nuevo por vidtv_psi_*_event_destroy() debido al puntero local no inicializado, por lo que se libera una vez m\u00e1s.\\n\\nPor lo tanto, para prevenir la vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n y doble liberaci\u00f3n, los punteros locales deben inicializarse a NULL al transferir la propiedad de la memoria.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/media/test-drivers/vidtv/vidtv_channel.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"c342e294dac4988c8ada759b2f057246e48c5108\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"12ab6ebb37789b84073e83e4d9b14a5e0d133323\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"3caa18d35f1dabe85a3dd31bc387f391ac9f9b4e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"fb9bd6d8d314b748e946ed6555eb4a956ee8c4d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"a69c7fd603bf5ad93177394fbd9711922ee81032\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"30f4d4e5224a9e44e9ceb3956489462319d804ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3be8037960bccd13052cfdeba8805ad785041d70\",\"lessThan\":\"98aabfe2d79f74613abc2b0b1cef08f97eaf5322\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/media/test-drivers/vidtv/vidtv_channel.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.248\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.198\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.160\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.64\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.3\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/12ab6ebb37789b84073e83e4d9b14a5e0d133323\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/30f4d4e5224a9e44e9ceb3956489462319d804ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3caa18d35f1dabe85a3dd31bc387f391ac9f9b4e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/98aabfe2d79f74613abc2b0b1cef08f97eaf5322\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a69c7fd603bf5ad93177394fbd9711922ee81032\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c342e294dac4988c8ada759b2f057246e48c5108\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb9bd6d8d314b748e946ed6555eb4a956ee8c4d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-21T11:44:13+00:00",
      "cve": "CVE-2025-68808",
      "id": "CVE-2025-68808",
      "initial_release_date": "2025-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Memory corruption in vidtv due to uninitialized pointers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68808.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T16:44:16Z",
      "cve": "CVE-2025-68808",
      "id": "CVE-2025-68808",
      "initial_release_date": "2026-01-15T00:25:53Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "498",
      "product_status:known_not_affected": "233",
      "product_status:recommended": "384",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68808",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68808.json",
      "version": "33"
    }
  }
}



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