{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68467", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.396Z", "datePublished": "2026-08-15T05:51:25.949Z", "dateUpdated": "2026-08-17T05:39:11.779Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:39:11.779Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/devices/mchp23k256.c" ], "versions": [ { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "2e179b028da9fd628a09286a2c9df4fa076b2cc9", "status": "affected", "versionType": "git" }, { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "a0c38083623c8b210a5b87fd34bebd05aa935ae8", "status": "affected", "versionType": "git" }, { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc", "status": "affected", "versionType": "git" }, { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "dbe2254d1da99c986f9a3392471fc5eaa3229647", "status": "affected", "versionType": "git" }, { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "04ebd3766861f219325852c9598e0f0281cb3636", "status": "affected", "versionType": "git" }, { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "09e044192a42f716215fbd1a100ee87fa57426aa", "status": "affected", "versionType": "git" }, { "version": "4379075a870b8de43a9ecd5b46884953234fc669", "lessThan": "d322e40f4edf92bf0ca329e5aa4ae1c0316feb38", "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/mtd/devices/mchp23k256.c" ], "versions": [ { "version": "4.13", "status": "affected" }, { "version": "0", "lessThan": "4.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "4.13", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2e179b028da9fd628a09286a2c9df4fa076b2cc9" }, { "url": "https://git.kernel.org/stable/c/a0c38083623c8b210a5b87fd34bebd05aa935ae8" }, { "url": "https://git.kernel.org/stable/c/7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc" }, { "url": "https://git.kernel.org/stable/c/dbe2254d1da99c986f9a3392471fc5eaa3229647" }, { "url": "https://git.kernel.org/stable/c/04ebd3766861f219325852c9598e0f0281cb3636" }, { "url": "https://git.kernel.org/stable/c/09e044192a42f716215fbd1a100ee87fa57426aa" }, { "url": "https://git.kernel.org/stable/c/d322e40f4edf92bf0ca329e5aa4ae1c0316feb38" } ], "title": "mtd: mchp23k256: use SPI match data for chip caps", "x_generator": { "engine": "bippy-1.2.0" } } } }