CVE-2023-53493

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2023-53493", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-01T11:39:39.403Z", "datePublished": "2025-10-01T11:45:44.939Z", "dateUpdated": "2026-08-05T09:14:25.393Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:14:25.393Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/qaic: tighten bounds checking in decode_message()\n\nCopy the bounds checking from encode_message() to decode_message().\n\nThis patch addresses the following concerns. Ensure that there is\nenough space for at least one header so that we don't have a negative\nsize later.\n\n\tif (msg_hdr_len < sizeof(*trans_hdr))\n\nEnsure that we have enough space to read the next header from the\nmsg->data.\n\n\tif (msg_len > msg_hdr_len - sizeof(*trans_hdr))\n\t\treturn -EINVAL;\n\nCheck that the trans_hdr->len is not below the minimum size:\n\n\tif (hdr_len < sizeof(*trans_hdr))\n\nThis minimum check ensures that we don't corrupt memory in\ndecode_passthrough() when we do.\n\n\tmemcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr));\n\nAnd finally, use size_add() to prevent an integer overflow:\n\n\tif (size_add(msg_len, hdr_len) > msg_hdr_len)"}], "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 malicious input is the MHI control-channel response emitted by the attached Qualcomm Cloud AI 100 PCIe/M.2 accelerator, so the attack originates from locally-attached hardware or firmware-compromised on-card QSM (the card executes untrusted tenant model workloads in cloud AI deployments), not from any network. This matches the kernel CNA precedent for analogous MHI host-driver bugs (CVE-2023-53598, CVE-2025-39790).\nAC:L - The device has complete, deterministic control over every byte of the response \u2014 magic number, sequence number, `hdr.len`, `hdr.count`, and each `wire_trans_hdr` \u2014 and `decode_message()` consumes it unconditionally; setting `trans_hdr->type = QAIC_TRANS_PASSTHROUGH_FROM_DEV` with `len = 0` reliably reaches the underflowed `memcpy()` every time, with no race, no timing window, and no memory-layout condition outside the attacker's influence.\nPR:N - No host account, credential, or capability is needed: `qaic_mhi_probe()` invokes `get_cntl_version()` \u2192 `decode_message()` automatically at device power-up, and `qaic_control_open()` installs `valid_crc_stub` so that first response's CRC is not even validated. A compromised device can also force re-entry by triggering an MHI SYS_ERROR/reset; on the user-driven path the `QAIC_MANAGE` ioctl carries flags `0` (no `DRM_ROOT_ONLY`, no `DRM_AUTH`), so an unprivileged holder of `/dev/accel/accelN` suffices.\nUI:N - The vulnerable decode runs from the MHI probe path and the control-response workqueue with no victim action required \u2014 no mount, no file open, no administrator step. Device enumeration and driver bring-up alone execute the parser.\nS:U - The out-of-bounds read and the unbounded `memcpy()` write both land in the host kernel's own heap, the same security authority as the vulnerable driver. No hypervisor, IOMMU, or sandbox boundary is crossed by the corruption itself.\nC:H - Without the `msg_len > msg_hdr_len - sizeof(*trans_hdr)` guard, `trans_hdr` is read past the end of the 4 KB `kmalloc()`'d (not zeroed) response buffer, and `decode_passthrough()` copies out-of-bounds source bytes into `user_msg->data`, which `qaic_manage_ioctl()` hands straight back via `copy_to_user()` \u2014 a direct kernel-heap disclosure primitive. The same underflowed copy also reads far beyond the source buffer.\nI:H - `memcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr))` with a device-supplied `len < 8` produces a size of ~2^64, giving an out-of-bounds heap write whose source contents are entirely device-controlled, into a destination that in the probe path is a ~32-byte allocation. That is a fully controlled slab overflow suitable for adjacent-object corruption and control-flow hijack.\nA:H - The underflowed `memcpy()` walks off the end of the slab and past the mapped heap, guaranteeing slab corruption, an oops, and a kernel panic; the missing `hdr_len` minimum also permits a zero-advance transaction loop. The attacking device can repeat this on every probe or reset, denying service permanently."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/accel/qaic/qaic_control.c"], "versions": [{"version": "129776ac2e38231fa9c02ce20e116c99de291666", "lessThan": "57d14cb3bae4619ce2fb5235cb318c3d5d8f53fd", "status": "affected", "versionType": "git"}, {"version": "129776ac2e38231fa9c02ce20e116c99de291666", "lessThan": "51b56382ed2a2b03347372272362b3baa623ed1e", "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/accel/qaic/qaic_control.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.4.7", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5", "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": "6.4", "versionEndExcluding": "6.4.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/57d14cb3bae4619ce2fb5235cb318c3d5d8f53fd"}, {"url": "https://git.kernel.org/stable/c/51b56382ed2a2b03347372272362b3baa623ed1e"}], "title": "accel/qaic: tighten bounds checking in decode_message()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/accel/qaic/qaic_control.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "57d14cb3bae4619ce2fb5235cb318c3d5d8f53fd", "status": "affected", "version": "129776ac2e38231fa9c02ce20e116c99de291666", "versionType": "git"}, {"lessThan": "51b56382ed2a2b03347372272362b3baa623ed1e", "status": "affected", "version": "129776ac2e38231fa9c02ce20e116c99de291666", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/accel/qaic/qaic_control.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"lessThan": "6.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.4.*", "status": "unaffected", "version": "6.4.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.5", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F0A196A6-6406-4DCB-A811-EA46E4E65BD1", "versionEndExcluding": "6.4.7", "versionStartIncluding": "6.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.5:rc1:*:*:*:*:*:*", "matchCriteriaId": "0B3E6E4D-E24E-4630-B00C-8C9901C597B0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.5:rc2:*:*:*:*:*:*", "matchCriteriaId": "E4A01A71-0F09-4DB2-A02F-7EFFBE27C98D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/qaic: tighten bounds checking in decode_message()\n\nCopy the bounds checking from encode_message() to decode_message().\n\nThis patch addresses the following concerns. Ensure that there is\nenough space for at least one header so that we don't have a negative\nsize later.\n\n\tif (msg_hdr_len < sizeof(*trans_hdr))\n\nEnsure that we have enough space to read the next header from the\nmsg->data.\n\n\tif (msg_len > msg_hdr_len - sizeof(*trans_hdr))\n\t\treturn -EINVAL;\n\nCheck that the trans_hdr->len is not below the minimum size:\n\n\tif (hdr_len < sizeof(*trans_hdr))\n\nThis minimum check ensures that we don't corrupt memory in\ndecode_passthrough() when we do.\n\n\tmemcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr));\n\nAnd finally, use size_add() to prevent an integer overflow:\n\n\tif (size_add(msg_len, hdr_len) > msg_hdr_len)"}], "id": "CVE-2023-53493", "lastModified": "2026-08-04T10:19:09.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-10-01T12:15:52.540", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/51b56382ed2a2b03347372272362b3baa623ed1e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/57d14cb3bae4619ce2fb5235cb318c3d5d8f53fd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: accel/qaic: tighten bounds checking in decode_message()", "id": "2400825", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400825"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53493", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:rhivos:1", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat In-Vehicle Operating System 1"}], "public_date": "2025-10-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53493\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53493\nhttps://lore.kernel.org/linux-cve-announce/2025100124-CVE-2023-53493-ef00@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-02T08:38:48.561912+00:00", "updated": "2025-10-02T08:38:48.561993+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}