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CVE-2023-54284 (GCVE-0-2023-54284)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:23 – Updated: 2026-08-05 09:18
VLAI
Title
media: av7110: prevent underflow in write_ts_to_decoder()
Summary
In the Linux kernel, the following vulnerability has been resolved: media: av7110: prevent underflow in write_ts_to_decoder() The buf[4] value comes from the user via ts_play(). It is a value in the u8 range. The final length we pass to av7110_ipack_instant_repack() is "len - (buf[4] + 1) - 4" so add a check to ensure that the length is not negative. It's not clear that passing a negative len value does anything bad necessarily, but it's not best practice. With the new bounds checking the "if (!len)" condition is no longer possible or required so remove that.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 6680af5be9f08d830567e9118f76d3e64684db8f (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 6606e2404ee9e20a3ae5b42fc3660d41b739ed3e (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 620b983589e0223876bf1463b01100a9c67b56ba (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 86ba65e5357bfbb6c082f68b265a292ee1bdde1d (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < ca4ce92e3ec9fd3c7c936b912b95c53331d5159c (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 423350af9e27f005611bd881b1df2cab66de943d (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 77eeb4732135c18c2fdfab80839645b393f3e774 (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < 7b93ab60fe9ed04be0ff155bc30ad39dea23e22b (git)
Affected: fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf , < eed9496a0501357aa326ddd6b71408189ed872eb (git)
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Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 4.14.315 , ≤ 4.14.* (semver)
Unaffected: 4.19.283 , ≤ 4.19.* (semver)
Unaffected: 5.4.243 , ≤ 5.4.* (semver)
Unaffected: 5.10.211 , ≤ 5.10.* (semver)
Unaffected: 5.15.111 , ≤ 5.15.* (semver)
Unaffected: 6.1.28 , ≤ 6.1.* (semver)
Unaffected: 6.2.15 , ≤ 6.2.* (semver)
Unaffected: 6.3.2 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: av7110: prevent underflow in write_ts_to_decoder()\n\nThe buf[4] value comes from the user via ts_play().  It is a value in\nthe u8 range.  The final length we pass to av7110_ipack_instant_repack()\nis \"len - (buf[4] + 1) - 4\" so add a check to ensure that the length is\nnot negative.  It\u0027s not clear that passing a negative len value does\nanything bad necessarily, but it\u0027s not best practice.\n\nWith the new bounds checking the \"if (!len)\" condition is no longer\npossible or required so remove that."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only by writing crafted MPEG-TS packets to local DVB character devices (`/dev/dvb/adapterN/video0`, `audio0`, or `dvr0`) via `ts_play()`/`dvbdmx_write()`. No network or remote peer is involved.\nAC:L - The attacker directly supplies `buf[3]` (ADAPT_FIELD flag) and `buf[4]` (adaptation length 184\u2013255) in the 188-byte packet, so the underflow triggers deterministically; the preceding ipack state (`mpeg=1, found=7, which=0, check=0x40`) is set up with one prior well-formed packet, with no race or uncontrolled condition.\nPR:L - Only an open file descriptor on the DVB device node is needed \u2014 `dvb_video_ioctl()` applies no capability check to `VIDEO_SELECT_SOURCE`, and `dvb_dvr_write()`/`dvbdmx_write()` require no privilege. Any unprivileged user in the `video` group, or the unprivileged media process on a DVB appliance, can trigger it.\nUI:N - Exploitation is entirely self-contained in the attacker\u0027s own `open()`/`ioctl()`/`write()` sequence; no victim action or interaction is required.\nS:U - The overread and state corruption stay within the kernel\u0027s own security authority in the av7110 driver; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The negative length defeats the `c \u003c count` guards in the PES-header path of `av7110_ipack_instant_repack()`, letting the attacker read kernel memory at a self-chosen offset 1\u201372 bytes past the end of the 188-byte packet \u2014 via the `dvr0`/`memdup_user()` path that is adjacent slab data past a kmalloc-192 object, repeatable to sweep the whole window into the decoder stream.\nI:N - All `write_ipack()` copies remain clamped by `p-\u003esize`, and the `u32` comparisons against `p-\u003eplength` prevent `p-\u003efound` from going negative, so no out-of-bounds or attacker-controlled write primitive exists.\nA:H - The out-of-bounds slab read past a kmalloc-192 object can fault or trip KASAN/KFENCE/DEBUG_PAGEALLOC guard pages, panicking the kernel, and the same malformed packet drives `p-\u003efound` past `p-\u003eplength + 6`, permanently wedging the A/V decoder feed until the device is reset."
            }
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        "dateUpdated": "2026-08-05T09:18:55.094Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6680af5be9f08d830567e9118f76d3e64684db8f"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/eed9496a0501357aa326ddd6b71408189ed872eb"
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      ],
      "title": "media: av7110: prevent underflow in write_ts_to_decoder()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54284",
    "datePublished": "2025-12-30T12:23:25.116Z",
    "dateReserved": "2025-12-30T12:06:44.525Z",
    "dateUpdated": "2026-08-05T09:18:55.094Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2023-54284",
      "date": "2026-09-14",
      "epss": "0.00154",
      "percentile": "0.04819"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54284\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:17.407\",\"lastModified\":\"2026-08-04T11:16:39.110\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: av7110: prevent underflow in write_ts_to_decoder()\\n\\nThe buf[4] value comes from the user via ts_play().  It is a value in\\nthe u8 range.  The final length we pass to av7110_ipack_instant_repack()\\nis \\\"len - (buf[4] + 1) - 4\\\" so add a check to ensure that the length is\\nnot negative.  It\u0027s not clear that passing a negative len value does\\nanything bad necessarily, but it\u0027s not best practice.\\n\\nWith the new bounds checking the \\\"if (!len)\\\" condition is no longer\\npossible or required so remove that.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nmedia: av7110: evitar desbordamiento negativo en write_ts_to_decoder()\\n\\nEl valor de buf[4] proviene del usuario a trav\u00e9s de ts_play(). Es un valor en el rango u8. La longitud final que pasamos a av7110_ipack_instant_repack() es \u0027len - (buf[4] + 1) - 4\u0027, por lo que se a\u00f1ade una comprobaci\u00f3n para asegurar que la longitud no sea negativa. No est\u00e1 claro que pasar un valor \u0027len\u0027 negativo cause algo malo necesariamente, pero no es una buena pr\u00e1ctica.\\n\\nCon la nueva comprobaci\u00f3n de l\u00edmites, la condici\u00f3n \u0027if (!len)\u0027 ya no es posible ni necesaria, por lo que se elimina.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/staging/media/av7110/av7110_av.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"6680af5be9f08d830567e9118f76d3e64684db8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"6606e2404ee9e20a3ae5b42fc3660d41b739ed3e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"620b983589e0223876bf1463b01100a9c67b56ba\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"86ba65e5357bfbb6c082f68b265a292ee1bdde1d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"ca4ce92e3ec9fd3c7c936b912b95c53331d5159c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"423350af9e27f005611bd881b1df2cab66de943d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"77eeb4732135c18c2fdfab80839645b393f3e774\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"7b93ab60fe9ed04be0ff155bc30ad39dea23e22b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf\",\"lessThan\":\"eed9496a0501357aa326ddd6b71408189ed872eb\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/staging/media/av7110/av7110_av.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.31\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.31\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.315\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.283\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.243\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.211\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.111\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.28\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2.15\",\"lessThanOrEqual\":\"6.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.3.2\",\"lessThanOrEqual\":\"6.3.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.4\",\"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:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/423350af9e27f005611bd881b1df2cab66de943d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/620b983589e0223876bf1463b01100a9c67b56ba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6606e2404ee9e20a3ae5b42fc3660d41b739ed3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6680af5be9f08d830567e9118f76d3e64684db8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77eeb4732135c18c2fdfab80839645b393f3e774\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b93ab60fe9ed04be0ff155bc30ad39dea23e22b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86ba65e5357bfbb6c082f68b265a292ee1bdde1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca4ce92e3ec9fd3c7c936b912b95c53331d5159c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eed9496a0501357aa326ddd6b71408189ed872eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T19:29:43+00:00",
      "cve": "CVE-2023-54284",
      "id": "CVE-2023-54284",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: media: av7110: prevent underflow in write_ts_to_decoder()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54284.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.