{"id":"CVE-2026-80745","state":"PUBLISHED","title":"regulator: fp9931: Fix VPOS/VNEG voltage selector table","description":"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).","publishedAt":"2026-09-03T08:26:27.739Z","updatedAt":"2026-09-04T04:58:25.988Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"12d821bd13d42e6de3ecb1c13918b1f06a3ee213","status":"affected","lessThan":"92a9594053831bf4c5886519688e155912befaee","versionType":"git"},{"version":"12d821bd13d42e6de3ecb1c13918b1f06a3ee213","status":"affected","lessThan":"66694b5f90f3876fccb87bbd02b453cdc33b3ae4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/regulator/fp9931.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.1.10","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/regulator/fp9931.c"]}],"references":["https://git.kernel.org/stable/c/92a9594053831bf4c5886519688e155912befaee","https://git.kernel.org/stable/c/66694b5f90f3876fccb87bbd02b453cdc33b3ae4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80745.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80745","state":"PUBLISHED","datePublished":"2026-09-03T08:26:27.739Z","dateUpdated":"2026-09-04T04:58:25.988Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.790Z"},"containers":{"cna":{"title":"regulator: fp9931: Fix VPOS/VNEG voltage selector table","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)."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"12d821bd13d42e6de3ecb1c13918b1f06a3ee213","status":"affected","lessThan":"92a9594053831bf4c5886519688e155912befaee","versionType":"git"},{"version":"12d821bd13d42e6de3ecb1c13918b1f06a3ee213","status":"affected","lessThan":"66694b5f90f3876fccb87bbd02b453cdc33b3ae4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/regulator/fp9931.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"7.1.10","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/regulator/fp9931.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/92a9594053831bf4c5886519688e155912befaee"},{"url":"https://git.kernel.org/stable/c/66694b5f90f3876fccb87bbd02b453cdc33b3ae4"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-04T04:58:25.988Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}