CVE-2026-68467 (GCVE-0-2026-68467)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
mtd: mchp23k256: use SPI match data for chip caps
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: mchp23k256: use SPI match data for chip caps The driver stores chip capacity information in both the OF match table and the SPI id table. Probe currently uses of_device_get_match_data(), so a non-OF SPI modalias match falls back to mchp23k256_caps even when the SPI id table selected a different part. Use spi_get_device_match_data() so SPI id-table driver_data is consumed when OF match data is absent. This keeps the existing default fallback while avoiding the wrong MTD geometry for id-table-only matches.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < 2e179b028da9fd628a09286a2c9df4fa076b2cc9 (git)
Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < a0c38083623c8b210a5b87fd34bebd05aa935ae8 (git)
Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < 7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc (git)
Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < dbe2254d1da99c986f9a3392471fc5eaa3229647 (git)
Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < 04ebd3766861f219325852c9598e0f0281cb3636 (git)
Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < 09e044192a42f716215fbd1a100ee87fa57426aa (git)
Affected: 4379075a870b8de43a9ecd5b46884953234fc669 , < d322e40f4edf92bf0ca329e5aa4ae1c0316feb38 (git)
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Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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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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            "baseSeverity": "HIGH",
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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-\u003esize 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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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68467",
    "datePublished": "2026-08-15T05:51:25.949Z",
    "dateReserved": "2026-07-30T09:28:09.396Z",
    "dateUpdated": "2026-08-17T05:39:11.779Z",
    "state": "PUBLISHED"
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This keeps the existing default fallback\\nwhile avoiding the wrong MTD geometry for id-table-only matches.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/mtd/devices/mchp23k256.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"2e179b028da9fd628a09286a2c9df4fa076b2cc9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"a0c38083623c8b210a5b87fd34bebd05aa935ae8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"dbe2254d1da99c986f9a3392471fc5eaa3229647\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"04ebd3766861f219325852c9598e0f0281cb3636\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"09e044192a42f716215fbd1a100ee87fa57426aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4379075a870b8de43a9ecd5b46884953234fc669\",\"lessThan\":\"d322e40f4edf92bf0ca329e5aa4ae1c0316feb38\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/mtd/devices/mchp23k256.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/04ebd3766861f219325852c9598e0f0281cb3636\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/09e044192a42f716215fbd1a100ee87fa57426aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2e179b028da9fd628a09286a2c9df4fa076b2cc9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7c0a3a73dccc9a3fc701f6be762449f18d0ca0fc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0c38083623c8b210a5b87fd34bebd05aa935ae8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d322e40f4edf92bf0ca329e5aa4ae1c0316feb38\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dbe2254d1da99c986f9a3392471fc5eaa3229647\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T15:28:16+00:00",
      "cve": "CVE-2026-68467",
      "id": "CVE-2026-68467",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mtd: mchp23k256: use SPI match data for chip caps",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68467.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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