CVE-2026-74712

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74712", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.928Z", "datePublished": "2026-08-22T15:33:08.392Z", "dateUpdated": "2026-08-25T05:41:54.897Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:54.897Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/mlx5: Fix buffer length in create_direct_keys()\n\nWe have seen in our CI the following KASAN message:\nBUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]\nRead of size 272 at addr 0000000176795020 by task qemu-system-s39/82764\n[...]\n[<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core]\n[<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\n[<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\n[<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\n[...]\nThe buggy address is located 4128 bytes inside of\nallocated 4384-byte region [0000000176794000, 0000000176795120)\n\nSo in essence we read 16 bytes beyond 4384-byte allocation.\ncreate_direct_keys calculates the pointer and length for in and out\nbuffers.\nThe size calculation for in includes the entire structure\nsize (out + in + mtt[]) but the pointer passed to cmd_exec points only\nto the 'in' field, skipping the 'out' field.\n\nThis causes mlx5_copy_to_msg() to read beyond the allocated buffer\nby sizeof(out) bytes when copying command data.\n\nProperly calculate the input size to match the pointer and allocation size."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.3, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached when host vDPA memory keys are created during IOTLB/set_map handling on /dev/vhost-vdpa (ioctl/write from QEMU/vhost), not from remote network packet processing; worst case is a co-tenant VM guest driving host QEMU virtio memory updates on the same mlx5 vDPA host.\nAC:L - Once mlx5 vDPA user MR setup runs, create_direct_keys() always passes an oversized inlen to mlx5_cmd_exec_cb(), deterministically causing mlx5_copy_to_msg() to read past the slab allocation; no race or victim state is required beyond normal virtio memory mapping.\nPR:N - In cloud mlx5 virtio-vDPA deployments a malicious VM tenant needs no host credentials\u2014normal guest virtio-net bring-up causes QEMU to issue vhost IOTLB updates that invoke mlx5_vdpa_set_map() and create_user_mr() on the host without CAP_NET_ADMIN or root in the host init namespace.\nUI:N - Exploitation requires only automated virtio driver initialization and memory table updates; no additional victim clicks, mounts, or manual actions are needed beyond provisioning a vDPA-backed VM, which is the intended operational path.\nS:C - The vulnerable mlx5 vDPA code runs in the hypervisor host kernel while the practical attacker is a guest VM tenant; successful slab out-of-bounds reads and corrupted firmware commands cross the guest/host virtualization boundary per KVM guest-to-host guidance.\nC:H - Incorrect inlen makes mlx5_copy_to_msg() perform a slab out-of-bounds read (KASAN-reported) of adjacent kernel heap memory, copying leaked bytes into CREATE_MKEY commands and enabling arbitrary kernel information disclosure, not a bounded benign leak.\nI:H - The over-read injects adjacent heap contents into firmware CREATE_MKEY command buffers, corrupting memory-key setup data sent to the mlx5 device; this is exploitable kernel memory corruption that can alter device DMA mappings and enable further control, not a read-only crash.\nA:H - The flaw triggers a KASAN slab-out-of-bounds fault in mlx5_core cmd_exec() during normal MR creation; such heap corruption commonly causes kernel oops/panic and can also destabilize vDPA networking on repeated virtio memory remaps."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/vdpa/mlx5/core/mr.c"], "versions": [{"version": "0071b138d44af4296bf871e6624369ce697b4b15", "lessThan": "ec3bb289cf19d526224117d5d450a5fd9cbd5ab2", "status": "affected", "versionType": "git"}, {"version": "0071b138d44af4296bf871e6624369ce697b4b15", "lessThan": "cde8931a25392670dd59a0acfcab87a830ab66c5", "status": "affected", "versionType": "git"}, {"version": "0071b138d44af4296bf871e6624369ce697b4b15", "lessThan": "6c8a9f7bc00301e533a5366384f3070a8e7f8430", "status": "affected", "versionType": "git"}, {"version": "0071b138d44af4296bf871e6624369ce697b4b15", "lessThan": "727e1f569855df83579edbd73dcb4a0723543a12", "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/vdpa/mlx5/core/mr.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "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": "6.12", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2"}, {"url": "https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5"}, {"url": "https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430"}, {"url": "https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12"}], "title": "vdpa/mlx5: Fix buffer length in create_direct_keys()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/vdpa/mlx5/core/mr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ec3bb289cf19d526224117d5d450a5fd9cbd5ab2", "status": "affected", "version": "0071b138d44af4296bf871e6624369ce697b4b15", "versionType": "git"}, {"lessThan": "cde8931a25392670dd59a0acfcab87a830ab66c5", "status": "affected", "version": "0071b138d44af4296bf871e6624369ce697b4b15", "versionType": "git"}, {"lessThan": "6c8a9f7bc00301e533a5366384f3070a8e7f8430", "status": "affected", "version": "0071b138d44af4296bf871e6624369ce697b4b15", "versionType": "git"}, {"lessThan": "727e1f569855df83579edbd73dcb4a0723543a12", "status": "affected", "version": "0071b138d44af4296bf871e6624369ce697b4b15", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/vdpa/mlx5/core/mr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa/mlx5: Fix buffer length in create_direct_keys()\n\nWe have seen in our CI the following KASAN message:\nBUG: KASAN: slab-out-of-bounds in cmd_exec+0x550/0xca0 [mlx5_core]\nRead of size 272 at addr 0000000176795020 by task qemu-system-s39/82764\n[...]\n[<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core]\n[<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\n[<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\n[<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\n[...]\nThe buggy address is located 4128 bytes inside of\nallocated 4384-byte region [0000000176794000, 0000000176795120)\n\nSo in essence we read 16 bytes beyond 4384-byte allocation.\ncreate_direct_keys calculates the pointer and length for in and out\nbuffers.\nThe size calculation for in includes the entire structure\nsize (out + in + mtt[]) but the pointer passed to cmd_exec points only\nto the 'in' field, skipping the 'out' field.\n\nThis causes mlx5_copy_to_msg() to read beyond the allocated buffer\nby sizeof(out) bytes when copying command data.\n\nProperly calculate the input size to match the pointer and allocation size."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nvdpa/mlx5: Correcci\u00f3n de la longitud del b\u00fafer en create_direct_keys()\n\nHemos visto en nuestro CI el siguiente mensaje de KASAN:\nBUG: KASAN: slab-out-of-bounds en cmd_exec+0x550/0xca0 [mlx5_core]\nLectura de tama\u00f1o 272 en la direcci\u00f3n 0000000176795020 por la tarea qemu-system-s39/82764\n[...]\n[<000011388ab3a7a0>] cmd_exec+0x550/0xca0 [mlx5_core]\n[<000011388ab3b61c>] mlx5_cmd_exec_cb+0x25c/0x4f0 [mlx5_core]\n[<000011388b21e82e>] mlx5_vdpa_exec_async_cmds+0x22e/0x5e0 [mlx5_vdpa]\n[<000011388b21fd44>] create_direct_keys+0x954/0xef0 [mlx5_vdpa]\n[...]\nLa direcci\u00f3n err\u00f3nea se encuentra 4128 bytes dentro de la regi\u00f3n asignada de 4384 bytes [0000000176794000, 0000000176795120)\n\nAs\u00ed que, en esencia, leemos 16 bytes m\u00e1s all\u00e1 de la asignaci\u00f3n de 4384 bytes.\ncreate_direct_keys calcula el puntero y la longitud para los b\u00faferes de entrada y salida.\nEl c\u00e1lculo del tama\u00f1o para la entrada incluye el tama\u00f1o de toda la estructura (salida + entrada + mtt[]) pero el puntero pasado a cmd_exec apunta solo al campo 'in', omitiendo el campo 'out'.\n\nEsto hace que mlx5_copy_to_msg() lea m\u00e1s all\u00e1 del b\u00fafer asignado por sizeof(out) bytes al copiar datos de comando.\n\nCalcular correctamente el tama\u00f1o de entrada para que coincida con el puntero y el tama\u00f1o de asignaci\u00f3n."}], "id": "CVE-2026-74712", "lastModified": "2026-10-14T13:10:00.187", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-22T16:16:45.957", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6c8a9f7bc00301e533a5366384f3070a8e7f8430"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/727e1f569855df83579edbd73dcb4a0723543a12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cde8931a25392670dd59a0acfcab87a830ab66c5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ec3bb289cf19d526224117d5d450a5fd9cbd5ab2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: vdpa/mlx5: Fix buffer length in create_direct_keys()", "id": "2521368", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521368"}, "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"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's `vdpa/mlx5` driver. This vulnerability occurs due to an incorrect calculation of buffer length within the `create_direct_keys()` function, causing the system to read beyond its allocated memory boundaries. A local attacker could exploit this memory corruption to trigger a system crash, leading to a denial of service (DoS), or potentially gain access to sensitive information."], "name": "CVE-2026-74712", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74712\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74712\nhttps://lore.kernel.org/linux-cve-announce/2026082238-CVE-2026-74712-1399@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0071b138d44af4296bf871e6624369ce697b4b15,ec3bb289cf19d526224117d5d450a5fd9cbd5ab2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0071b138d44af4296bf871e6624369ce697b4b15,cde8931a25392670dd59a0acfcab87a830ab66c5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0071b138d44af4296bf871e6624369ce697b4b15,6c8a9f7bc00301e533a5366384f3070a8e7f8430)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0071b138d44af4296bf871e6624369ce697b4b15,727e1f569855df83579edbd73dcb4a0723543a12)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T19:00:14.810194+00:00", "updated": "2026-08-25T08:30:04.569754+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}