243 lines
13 KiB
JSON
243 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-68467",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-30T09:28:09.396Z",
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"datePublished": "2026-08-15T05:51:25.949Z",
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"dateUpdated": "2026-08-17T05:39:11.779Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:39:11.779Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: mchp23k256: use SPI match data for chip caps\n\nThe driver stores chip capacity information in both the OF match table\nand the SPI id table. Probe currently uses of_device_get_match_data(),\nso a non-OF SPI modalias match falls back to mchp23k256_caps even when\nthe SPI id table selected a different part.\n\nUse spi_get_device_match_data() so SPI id-table driver_data is consumed\nwhen OF match data is absent. This keeps the existing default fallback\nwhile avoiding the wrong MTD geometry for id-table-only matches."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The flaw is exercised only through local MTD I/O (mtdchar read/write or MEMREAD/MEMWRITE ioctls on /dev/mtdN) after probe; mchp23k256 is an on-board SPI SRAM driver with no network, Bluetooth, or remote-protocol entry point.\nAC:L - On affected deployments (mchp23lcv1024 matched via SPI id table without OF), every mtd read/write deterministically uses 2-byte addresses on a 3-byte/128K part; the attacker chooses offsets and lengths to mis-map logical MTD access across the chip with no race or uncontrollable memory layout.\nPR:L - The path from mtdchar_open through mchp23k256_read/write performs no capability checks beyond device-node permissions; on embedded/industrial boards where SPI SRAM MTD nodes are group- or world-accessible, a local unprivileged user can trigger the defective addressing.\nUI:N - No victim interaction is required beyond the attacker issuing their own mtd reads or writes; probe misconfiguration is automatic at boot and persists for all subsequent transfers.\nS:U - Impact is confined to incorrect SPI SRAM access within the same kernel/host security authority; there is no VM escape, IOMMU bypass, or cross-sandbox boundary crossing.\nC:H - Wrong addr_width makes SPI reads return data from unintended chip offsets while mtdchar still caps logical size at 32K, enabling out-of-bounds disclosure of up to ~96K of 128K SRAM contents (credentials, runtime state) outside the reported geometry.\nI:H - Mis-encoded write addresses cause out-of-bounds stores into the full 128K device despite mtd->size enforcing a 32K bound, corrupting SRAM regions the attacker should not be able to reach through the MTD interface.\nA:H - Desynchronized SPI transactions from address-width mismatch can stall spi_sync() and hang the bus, and corrupted on-board SRAM can crash safety-critical embedded services or trigger watchdog resets on industrial controllers."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/mtd/devices/mchp23k256.c"
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],
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"versions": [
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "2e179b028da9fd628a09286a2c9df4fa076b2cc9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "a0c38083623c8b210a5b87fd34bebd05aa935ae8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "dbe2254d1da99c986f9a3392471fc5eaa3229647",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "04ebd3766861f219325852c9598e0f0281cb3636",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "09e044192a42f716215fbd1a100ee87fa57426aa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4379075a870b8de43a9ecd5b46884953234fc669",
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"lessThan": "d322e40f4edf92bf0ca329e5aa4ae1c0316feb38",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/mtd/devices/mchp23k256.c"
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],
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"versions": [
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{
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"version": "4.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.212",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.13",
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"versionEndExcluding": "5.15.212"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.13",
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"versionEndExcluding": "6.1.178"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2e179b028da9fd628a09286a2c9df4fa076b2cc9"
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},
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{
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"url": "https://git.kernel.org/stable/c/a0c38083623c8b210a5b87fd34bebd05aa935ae8"
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},
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{
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"url": "https://git.kernel.org/stable/c/7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc"
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},
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{
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"url": "https://git.kernel.org/stable/c/dbe2254d1da99c986f9a3392471fc5eaa3229647"
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},
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{
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"url": "https://git.kernel.org/stable/c/04ebd3766861f219325852c9598e0f0281cb3636"
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},
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{
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"url": "https://git.kernel.org/stable/c/09e044192a42f716215fbd1a100ee87fa57426aa"
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},
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{
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"url": "https://git.kernel.org/stable/c/d322e40f4edf92bf0ca329e5aa4ae1c0316feb38"
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}
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],
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"title": "mtd: mchp23k256: use SPI match data for chip caps",
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"x_generator": {
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}
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} |