{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80745", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.790Z", "datePublished": "2026-09-03T08:26:27.739Z", "dateUpdated": "2026-09-04T04:58:25.988Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T04:58:25.988Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregulator: fp9931: Fix VPOS/VNEG voltage selector table\n\nThe VPOSNEG_table[] mapping does not match the FP9931 datasheet.\n\nThe datasheet defines the VPOS/VNEG voltage mapping as:\n\n 00h-04h -> 7.04V (-7.04V)\n 05h -> 7.26V (-7.26V)\n 06h -> 7.49V (-7.49V)\n ...\n 28h-3Fh -> 15.06V (-15.06V)\n\nHowever, VPOSNEG_table[] has two issues:\n\n1. Selector 0x00~0x04 should all map to 7.04V (5 entries), but the\n table has 6 entries of 7.04V, causing all subsequent entries to be\n shifted by one position.\n\n2. Selectors 0x29~0x3F should all clamp to 15.06V (23 entries), but\n the table has only 41 entries. Any selector value above 0x28\n would result in an out-of-bounds table access.\n\nFix both issues by removing the duplicate 7.04V entry and appending\nthe missing 23 clamped 15.06V entries, bringing the table to the\ncorrect size of 64 entries (0x00~0x3F)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is in the FP9931/JD9930 I2C EPD PMIC driver reached only via local regulator core paths (regulator_set_voltage, get_voltage_sel, map_voltage_ascend/list_voltage_table) during probe and display power management; there is no network, Bluetooth, or physical-bus attack surface to this code.\nAC:L - On affected e-reader hardware the undersized VPOSNEG_table (41 vs 64 hardware selectors with vsel_mask 0x3F) makes selector values above 0x28 deterministically index past the table whenever map_voltage or list_voltage processes those selectors; no race or attacker-uncontrollable memory layout is required.\nPR:N - Regulator constraint application during fp9931_probe and automatic EPD/display regulator enable paths run at boot and during normal framebuffer updates without authentication; no CAP_SYS_ADMIN, init-namespace root, or special capability is checked before reaching the vulnerable voltage-mapping code.\nUI:N - Once the FP9931 PMIC is present, voltage selection is driven by kernel probe and display refresh without requiring a victim to mount a filesystem, click a link, or perform any cooperative action beyond normal device operation.\nS:U - Impact is confined to kernel memory reads and PMIC voltage programming within the host kernel security boundary on embedded e-reader platforms; this is not a VM escape, IOMMU bypass, or cross-container authority change.\nC:H - Out-of-bounds indexing of VPOSNEG_table[] in regulator_list_voltage_table reads adjacent kernel .rodata beyond the 41-entry array when selectors 0x29-0x3F are processed; out-of-bounds kernel reads are rated High per CVSS kernel guidance.\nI:H - The shifted voltage table causes regulator_map_voltage_ascend to select wrong VPOS/VNEG selectors written to PMIC registers (up to ±15.06V rails), and OOB table reads can return attacker-influencing values used for subsequent voltage programming, enabling incorrect high-voltage output.\nA:H - Out-of-bounds table access in kernel context can trigger oops or panic on misaligned rodata boundaries, and programming incorrect ±15V EPD rail voltages can hang, reset, or permanently damage display power hardware, matching High availability impact guidance." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/regulator/fp9931.c" ], "versions": [ { "version": "12d821bd13d42e6de3ecb1c13918b1f06a3ee213", "lessThan": "92a9594053831bf4c5886519688e155912befaee", "status": "affected", "versionType": "git" }, { "version": "12d821bd13d42e6de3ecb1c13918b1f06a3ee213", "lessThan": "66694b5f90f3876fccb87bbd02b453cdc33b3ae4", "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/regulator/fp9931.c" ], "versions": [ { "version": "6.19", "status": "affected" }, { "version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.19", "versionEndExcluding": "7.1.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/92a9594053831bf4c5886519688e155912befaee" }, { "url": "https://git.kernel.org/stable/c/66694b5f90f3876fccb87bbd02b453cdc33b3ae4" } ], "title": "regulator: fp9931: Fix VPOS/VNEG voltage selector table", "x_generator": { "engine": "bippy-1.2.0" } } } }