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CVE-2026-80575 (GCVE-0-2026-80575)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
Title
Input: cs40l50-vibra - validate custom data from user space
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: cs40l50-vibra - validate custom data from user space cs40l50_add() copies the custom data of an FF_PERIODIC/FF_CUSTOM effect straight from the ff_effect the user passed to EVIOCSFF, without requiring it to hold anything: work_data.custom_data = memdup_array_user(periodic->custom_data, periodic->custom_len, sizeof(s16)); work_data.custom_len = periodic->custom_len; The driver then reads two words out of that buffer: custom_data[0] as the waveform bank in cs40l50_effect_bank_set(), and custom_data[1] as the index within the bank in cs40l50_effect_index_set(). Neither read is covered by a length check, and custom_len is fully user controlled: - custom_len == 0 makes memdup_array_user() call memdup_user() with a length of zero, which returns ZERO_SIZE_PTR rather than an error, so custom_data[0] dereferences it. - custom_len == 1 allocates two bytes. A bank of ROM or RAM keeps effect->type out of the OWT case, and custom_data[1] is then read one word past the allocation. The bank value itself is also mishandled. It is masked with CS40L50_CUSTOM_DATA_MASK (0xffff) but stored in an s16, so a custom_data[0] of 0x8000 or above wraps to a negative value that passes the "bank_type >= CS40L50_WVFRM_BANK_NUM" test. cs40l50_effect_index_set() indexes vib->dsp.banks[] with it before the switch statement's default case gets a chance to reject it: base_index = vib->dsp.banks[effect->type].base_index; max_index = vib->dsp.banks[effect->type].max_index; Require the two words the driver reads to be present, and hold the masked bank in a u32 so the existing upper-bound test covers the whole range. The da7280 haptic driver already range checks custom_len this way.
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: c38fe1bb5d21c2ce0857965ee06174ee587d6b42 , < 3855b6a11f8a7aceb8181cc08c99afef58517006 (git)
Affected: c38fe1bb5d21c2ce0857965ee06174ee587d6b42 , < 52a818c586ae2c36b7324bfaefb547f5e866a8ae (git)
Affected: c38fe1bb5d21c2ce0857965ee06174ee587d6b42 , < d38554602a0b04e85fad28ce72c7500cf50d419b (git)
Affected: c38fe1bb5d21c2ce0857965ee06174ee587d6b42 , < 7d5c576cb1c86047b1fcb1aa9532e17fc5e46c1d (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/misc/cs40l50-vibra.c"
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          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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              "version": "6.18.46",
              "versionType": "semver"
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              "version": "7.1.10",
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                  "versionStartIncluding": "6.11",
                  "vulnerable": true
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                  "versionStartIncluding": "6.11",
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                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: cs40l50-vibra - validate custom data from user space\n\ncs40l50_add() copies the custom data of an FF_PERIODIC/FF_CUSTOM effect\nstraight from the ff_effect the user passed to EVIOCSFF, without\nrequiring it to hold anything:\n\n    work_data.custom_data = memdup_array_user(periodic-\u003ecustom_data,\n                                              periodic-\u003ecustom_len,\n                                              sizeof(s16));\n    work_data.custom_len = periodic-\u003ecustom_len;\n\nThe driver then reads two words out of that buffer: custom_data[0] as the\nwaveform bank in cs40l50_effect_bank_set(), and custom_data[1] as the\nindex within the bank in cs40l50_effect_index_set().  Neither read is\ncovered by a length check, and custom_len is fully user controlled:\n\n  - custom_len == 0 makes memdup_array_user() call memdup_user() with a\n    length of zero, which returns ZERO_SIZE_PTR rather than an error, so\n    custom_data[0] dereferences it.\n\n  - custom_len == 1 allocates two bytes.  A bank of ROM or RAM keeps\n    effect-\u003etype out of the OWT case, and custom_data[1] is then read one\n    word past the allocation.\n\nThe bank value itself is also mishandled.  It is masked with\nCS40L50_CUSTOM_DATA_MASK (0xffff) but stored in an s16, so a\ncustom_data[0] of 0x8000 or above wraps to a negative value that passes\nthe \"bank_type \u003e= CS40L50_WVFRM_BANK_NUM\" test.\ncs40l50_effect_index_set() indexes vib-\u003edsp.banks[] with it before the\nswitch statement\u0027s default case gets a chance to reject it:\n\n    base_index = vib-\u003edsp.banks[effect-\u003etype].base_index;\n    max_index = vib-\u003edsp.banks[effect-\u003etype].max_index;\n\nRequire the two words the driver reads to be present, and hold the masked\nbank in a u32 so the existing upper-bound test covers the whole range.\nThe da7280 haptic driver already range checks custom_len this way."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - Exploitation requires a local EVIOCSFF ioctl on the cs40l50_vibra evdev node (/dev/input/event*), traversing evdev_do_ioctl(), input_ff_upload(), and cs40l50_add(); there is no network, adjacent-radio, or physical-insertion path to this driver.\nAC:L - The attacker fully controls ff_effect fields (custom_len, custom_data[0]/[1], waveform type) passed through EVIOCSFF, so custom_len==0, custom_len==1, or bank values \u003e=0x8000 deterministically trigger the missing checks without races or uncontrollable layout.\nPR:L - No capability check exists on the EVIOCSFF path beyond opening the input device; on Android phones, Chromebooks, kiosks, and desktops, logged-in users or session uaccess ACLs commonly grant local access to haptic/input event nodes without init-namespace root.\nUI:N - Once the attacker can open the cs40l50_vibra event device, they issue EVIOCSFF themselves with crafted FF_PERIODIC/FF_CUSTOM parameters; no separate victim mount, plug-in, or interactive action is required.\nS:U - Impact is confined to kernel memory handling and haptic-driver state within the local host kernel; it does not cross VM, container, IOMMU, or other security-scope boundaries.\nC:H - custom_len==1 forces a kmalloc heap out-of-bounds read of custom_data[1], and s16 bank sign-wrap indexes dsp.banks[] out of bounds before validation, leaking adjacent kernel memory; custom_len==0 dereferences ZERO_SIZE_PTR on read.\nI:H - Unchecked custom_len and sign-wrapped bank values cause out-of-bounds kernel memory accesses in the force-feedback upload path; per CNA guidance such heap/array boundary violations in ioctl handlers are scored High because they can corrupt subsequent kernel arithmetic and device register programming.\nA:H - custom_len==0 makes memdup_array_user return ZERO_SIZE_PTR and cs40l50_effect_bank_set dereferences it, and the heap/array out-of-bounds reads can trigger kernel oops/panic or KASAN faults on affected CS40L50 haptic devices."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3855b6a11f8a7aceb8181cc08c99afef58517006"
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          "url": "https://git.kernel.org/stable/c/7d5c576cb1c86047b1fcb1aa9532e17fc5e46c1d"
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      "title": "Input: cs40l50-vibra - validate custom data from user space",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80575",
    "datePublished": "2026-08-26T14:37:34.942Z",
    "dateReserved": "2026-08-26T14:34:25.768Z",
    "dateUpdated": "2026-08-27T05:01:57.416Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-17",
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It is masked with\\nCS40L50_CUSTOM_DATA_MASK (0xffff) but stored in an s16, so a\\ncustom_data[0] of 0x8000 or above wraps to a negative value that passes\\nthe \\\"bank_type \u003e= CS40L50_WVFRM_BANK_NUM\\\" test.\\ncs40l50_effect_index_set() indexes vib-\u003edsp.banks[] with it before the\\nswitch statement\u0027s default case gets a chance to reject it:\\n\\n    base_index = vib-\u003edsp.banks[effect-\u003etype].base_index;\\n    max_index = vib-\u003edsp.banks[effect-\u003etype].max_index;\\n\\nRequire the two words the driver reads to be present, and hold the masked\\nbank in a u32 so the existing upper-bound test covers the whole range.\\nThe da7280 haptic driver already range checks custom_len this way.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/input/misc/cs40l50-vibra.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c38fe1bb5d21c2ce0857965ee06174ee587d6b42\",\"lessThan\":\"3855b6a11f8a7aceb8181cc08c99afef58517006\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c38fe1bb5d21c2ce0857965ee06174ee587d6b42\",\"lessThan\":\"52a818c586ae2c36b7324bfaefb547f5e866a8ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c38fe1bb5d21c2ce0857965ee06174ee587d6b42\",\"lessThan\":\"d38554602a0b04e85fad28ce72c7500cf50d419b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c38fe1bb5d21c2ce0857965ee06174ee587d6b42\",\"lessThan\":\"7d5c576cb1c86047b1fcb1aa9532e17fc5e46c1d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/input/misc/cs40l50-vibra.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"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/3855b6a11f8a7aceb8181cc08c99afef58517006\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/52a818c586ae2c36b7324bfaefb547f5e866a8ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d5c576cb1c86047b1fcb1aa9532e17fc5e46c1d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d38554602a0b04e85fad28ce72c7500cf50d419b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T06:49:52+00:00",
      "cve": "CVE-2026-80575",
      "id": "CVE-2026-80575",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: cs40l50-vibra - validate custom data from user space",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80575.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:37:25Z",
      "cve": "CVE-2026-80575",
      "id": "CVE-2026-80575",
      "initial_release_date": "2026-08-28T16:37:25Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80575",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80575.json",
      "version": "2"
    }
  }
}



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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.

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  • 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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Detection rules are retrieved from Rulezet.


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