{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54284", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.525Z", "datePublished": "2025-12-30T12:23:25.116Z", "dateUpdated": "2026-08-05T09:18:55.094Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:18:55.094Z" }, "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's not clear that passing a negative len value does\nanything bad necessarily, but it's not best practice.\n\nWith the new bounds checking the \"if (!len)\" condition is no longer\npossible or required so remove that." } ], "metrics": [ { "cvssV3_1": { "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" }, "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 184–255) 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 — `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's own `open()`/`ioctl()`/`write()` sequence; no victim action or interaction is required.\nS:U - The overread and state corruption stay within the kernel's own security authority in the av7110 driver; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The negative length defeats the `c < count` guards in the PES-header path of `av7110_ipack_instant_repack()`, letting the attacker read kernel memory at a self-chosen offset 1–72 bytes past the end of the 188-byte packet — 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->size`, and the `u32` comparisons against `p->plength` prevent `p->found` 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->found` past `p->plength + 6`, permanently wedging the A/V decoder feed until the device is reset." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/media/av7110/av7110_av.c" ], "versions": [ { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "6680af5be9f08d830567e9118f76d3e64684db8f", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "6606e2404ee9e20a3ae5b42fc3660d41b739ed3e", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "620b983589e0223876bf1463b01100a9c67b56ba", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "86ba65e5357bfbb6c082f68b265a292ee1bdde1d", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "ca4ce92e3ec9fd3c7c936b912b95c53331d5159c", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "423350af9e27f005611bd881b1df2cab66de943d", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "77eeb4732135c18c2fdfab80839645b393f3e774", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "7b93ab60fe9ed04be0ff155bc30ad39dea23e22b", "status": "affected", "versionType": "git" }, { "version": "fd46d16d602ab7fd53cef7ff55b9dcb0b47ad3bf", "lessThan": "eed9496a0501357aa326ddd6b71408189ed872eb", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/media/av7110/av7110_av.c" ], "versions": [ { "version": "2.6.31", "status": "affected" }, { "version": "0", "lessThan": "2.6.31", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.315", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.283", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.243", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.211", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.111", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.28", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.15", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.2", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "4.14.315" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "4.19.283" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.4.243" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.10.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "5.15.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.1.28" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.2.15" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.3.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6680af5be9f08d830567e9118f76d3e64684db8f" }, { "url": "https://git.kernel.org/stable/c/6606e2404ee9e20a3ae5b42fc3660d41b739ed3e" }, { "url": "https://git.kernel.org/stable/c/620b983589e0223876bf1463b01100a9c67b56ba" }, { "url": "https://git.kernel.org/stable/c/86ba65e5357bfbb6c082f68b265a292ee1bdde1d" }, { "url": "https://git.kernel.org/stable/c/ca4ce92e3ec9fd3c7c936b912b95c53331d5159c" }, { "url": "https://git.kernel.org/stable/c/423350af9e27f005611bd881b1df2cab66de943d" }, { "url": "https://git.kernel.org/stable/c/77eeb4732135c18c2fdfab80839645b393f3e774" }, { "url": "https://git.kernel.org/stable/c/7b93ab60fe9ed04be0ff155bc30ad39dea23e22b" }, { "url": "https://git.kernel.org/stable/c/eed9496a0501357aa326ddd6b71408189ed872eb" } ], "title": "media: av7110: prevent underflow in write_ts_to_decoder()", "x_generator": { "engine": "bippy-1.2.0" } } } }