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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read\n\nIn qla2x00_status_entry(), the FWI2 status path advances sense_data and\nshrinks par_sense_len by rsp_info_len:\n\n\tif (IS_FWI2_CAPABLE(ha)) {\n\t\tsense_data += rsp_info_len;\n\t\tpar_sense_len -= rsp_info_len;\n\t}\n\nrsp_info_len is a 32-bit value taken directly from the target\u0027s FCP\nresponse (sf.rsp_data_len), while par_sense_len is the IOCB data area\nsize (28 bytes for 24xx, 60 bytes for 29xx). A hostile or buggy target\nreporting an rsp_info_len larger than par_sense_len makes the unsigned\nsubtraction underflow to a huge value and advances sense_data out of\nbounds.\n\nThe underflowed par_sense_len then defeats the cap in\nqla2x00_handle_sense():\n\n\tif (sense_len \u003e par_sense_len)\n\t\tsense_len = par_sense_len;\n\tmemcpy(cp-\u003esense_buffer, sense_data, sense_len);\n\nso the memcpy reads up to SCSI_SENSE_BUFFERSIZE bytes from the\nout-of-bounds sense_data pointer, leaking adjacent response-ring/heap\nmemory into the command\u0027s sense buffer.\n\nClamp rsp_info_len to par_sense_len before the subtraction so\npar_sense_len can never underflow and sense_data stays within the IOCB\ndata area. The fix sits before the comp_status switch, covering both\nqla2x00_handle_sense() call sites."
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              "value": "AV:N - qla2xxx builds initiator status IOCBs from a remote Fibre Channel or FCoE target\u0027s FCP_RSP; QLogic CNAs speak FCoE and SAN fabrics are stretched across sites via FCIP/inter-fabric routing, so a malicious or compromised target delivers the crafted rsp_data_len over the storage network with no local access.\nAC:L - A hostile target fully controls FCP_RSP (SS_RESPONSE_INFO_LEN_VALID, rsp_data_len, sense_len, CHECK CONDITION, rsp_info[3]==0) and can return them on ordinary initiator I/O such as INQUIRY during fabric scan; no race, rare config, or victim state beyond a FWI2-capable HBA is required.\nPR:N - Completions are handled in the HBA interrupt/response-queue path (qla24xx_process_response_queue to qla2x00_status_entry) with no Linux credential or capability check; the attacker only needs to act as an FC/FCoE target on the fabric.\nUI:N - Once the target is visible on the fabric, the SCSI midlayer automatically issues commands (scan, path checks, mounted-filesystem I/O) whose STATUS_TYPE completions take the vulnerable path; no user mount, open, or other interactive step is required at exploit time.\nS:U - The out-of-bounds read and any resulting oops stay inside the host kernel that owns the qla2xxx driver and do not cross a VM, IOMMU, or other separate security authority.\nC:H - Attacker-controlled 32-bit rsp_info_len advances sense_data out of the 28-byte IOCB data area and underflows par_sense_len so qla2x00_handle_sense() copies up to SCSI_SENSE_BUFFERSIZE (96) bytes of adjacent response-ring or kernel memory into the command sense buffer, which userspace can read via SCSI completion, SG_IO, and BSG.\nI:N - The memcpy destination is the in-bounds SCSI sense buffer already capped at SCSI_SENSE_BUFFERSIZE; this is a source over-read only, with no out-of-bounds write, use-after-free, or control-flow hijack primitive.\nA:H - Adding a 32-bit attacker-chosen rsp_info_len to sense_data yields a wild kernel pointer; memcpy from an unmapped address in the interrupt-context response-queue path oopses or panics the host, and the target can repeat this on every command."
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    "dateUpdated": "2026-10-19T21:09:07.828Z",
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              "lang": "en",
              "value": "AV:L - Exploitation requires local control of bridge/ebtables configuration and arranging an skb with shared non-linear backing memory; remote ARP traffic alone cannot create the splice-backed page condition.\nAC:L - There is no race or rare external timing condition; the attacker can control the rule, ARP frame layout, and shared-frag setup needed to reach the write.\nPR:L - The ebtables rule path requires CAP_NET_ADMIN, but this is reachable with namespace-local privileges via user/network namespaces rather than requiring init-namespace root.\nUI:N - No victim action is required once the attacker can configure the namespace and send the crafted traffic through the bridge path.\nS:C - The bug can let namespace-local network privileges corrupt file-backed/page-cache memory outside the bridge/netfilter security boundary, plausibly crossing a sandbox or namespace boundary.\nC:H - The shared-page corruption can be leveraged toward privilege escalation or code execution, which can expose high-value system data.\nI:H - skb_store_bits() writes attacker-chosen MAC bytes into shared backing pages, giving a controlled corruption primitive against file-backed memory.\nA:H - Controlled corruption of shared/file-backed pages can damage critical files or executable contents and can be repeated to cause severe system availability impact."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Hold a dma-buf reference for imported BOs\n\nAn imported dma-buf BO is created as a ttm_bo_type_sg BO whose\nreservation object is the exporter\u0027s dma_buf-\u003eresv. The importer,\nhowever, only takes a dma-buf reference after a successful\ndma_buf_dynamic_attach(). Until then nothing keeps the exporter alive,\nso if the exporter is freed while the BO still references its resv, a\nlater access to that resv is a use-after-free:\n\n  Oops: general protection fault, probably for non-canonical address\n        0x6b6b6b6b6b6b6b9c\n  Workqueue: ttm ttm_bo_delayed_delete [ttm]\n  RIP: 0010:mutex_can_spin_on_owner+0x3f/0xc0\n\nThis can be reached on two paths:\n\n - dma_buf_dynamic_attach() fails, or\n - ttm_bo_init_reserved() fails during BO creation.\n\nIn both cases the BO already has bo-\u003ebase.resv pointing at the exporter\nresv, and sg BOs are always torn down via ttm_bo_delayed_delete(), which\nlocks bo-\u003ebase.resv asynchronously - potentially after the exporter has\nbeen freed.\n\nTake the dma-buf reference in xe_bo_init_locked(), before\nttm_bo_init_reserved(), so it also covers a creation failure there, and\nrelease it in xe_ttm_bo_destroy(). The reference is held for the whole\nBO lifetime, keeping the shared resv alive on every path.\n\nv2:\n  - Reworked the fix to avoid creating the imported sg BO before\n    dma_buf_dynamic_attach() succeeds.\n  - Attach with importer_priv == NULL and make invalidate_mappings ignore\n    incomplete imports.\n\nv3:\n  - Dropped the xe-side reordering approach since importer_priv must be\n    valid when dma_buf_dynamic_attach() publishes the attachment.\n  - Per Christian\u0027s suggestion on the v1 thread, keyed the check on\n    import_attach rather than removing the sg guard entirely.\n  - Fixes both xe and amdgpu in a single TTM patch.\n\nv4:\n  - Moved import_attach check to after dma_resv_copy_fences() so fences\n    are copied before returning for successful imports (Thomas).\n  - Removed exporter-alive claim from commit message (Thomas).\n\nv5:\n  - Add drm/xe patch to keep imported sg BOs off the LRU before attach\n    succeeds; the TTM fix alone is not sufficient for xe if the BO is\n    already LRU-visible. (Thomas)\n    v4 patch:\n    https://patchwork.freedesktop.org/patch/736663/?series=169129\u0026rev=2\n  - Patch 1 (drm/ttm) carries Christian\u0027s Reviewed-by from v4.\n\nv6:\n  - Reworked the fix based on Thomas\u0027 suggestion. Instead of the TTM resv\n    individualization (v1-v5) plus the xe off-LRU/placement handling (v5),\n    just hold a dma-buf reference for the imported BO lifetime so the\n    shared resv can never be freed while the BO still references it.\n    Single xe patch, no TTM change. (Thomas)\n  - Take the reference in xe_bo_init_locked() before ttm_bo_init_reserved()\n    so a TTM creation failure is covered too (Thomas).\n  - Dropped the v5 series (drm/ttm + drm/xe off-LRU); the off-LRU approach\n    also regressed in CI BAT via ttm_bo_pipeline_gutting() creating a ghost\n    BO that outlived the exporter.\n    Link to v5: https://patchwork.freedesktop.org/series/169984/\n\nv7:\n  - Move changelog above --- so it stays in the commit message.\n  - Reorder changelog entries oldest-to-newest. (Thomas)\n\n(cherry picked from commit 3516f3fae6be35642f8f06f8a218da6425c0306a)"
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              "value": "AV:L - The bug is reached through DRM_IOCTL_PRIME_FD_TO_HANDLE on an Intel xe DRM render node (/dev/dri/renderD*), which requires local access to the device file; there is no remote or network-facing path into xe_gem_prime_import().\nAC:L - The attacker fully controls both halves: they pick an exporter whose attach fails deterministically (drm_gem_map_attach() returns -ENOSYS, xe_dma_buf_attach() returns -EOPNOTSUPP for non-p2p cross-device imports) or induce the -ENOMEM paths, then simply close the dma-buf fd while the sg BO teardown is still queued on the TTM workqueue. No condition outside their control is needed.\nPR:L - DRM_IOCTL_PRIME_FD_TO_HANDLE is marked DRM_RENDER_ALLOW, so any unprivileged local user holding the normally world/group-accessible render node (any GUI user on a distro, any app on Android/ChromeOS) can perform the import; no capabilities are checked.\nUI:N - The entire sequence \u2014 export a dma-buf, import it into xe, close the fd \u2014 is performed by the attacker\u0027s own process; no victim action or cooperation is required.\nS:U - The use-after-free occurs on kernel heap memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed dma_buf/dma_resv is a slab object the attacker can reclaim with sprayed content before ttm_bo_delayed_delete() dereferences it, so the stale bo-\u003ebase.resv can be aimed at attacker-chosen kernel addresses and the resulting ww_mutex/fence walks leaked back, giving arbitrary kernel memory disclosure.\nI:H - dma_resv_lock()/dma_resv_unlock() and the subsequent ttm_bo_cleanup_memtype_use() perform writes and list manipulation through the dangling pointer into reclaimed heap memory, so the UAF yields a controllable write primitive usable for control-flow hijacking and privilege escalation.\nA:H - Even unexploited, the flaw reliably produces a kernel oops \u2014 the reported general protection fault on poisoned memory in mutex_can_spin_on_owner() from the ttm workqueue \u2014 which is a fatal fault in kernel worker context and takes down the GPU stack or the whole machine."
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              "version": "54007f818206dc27309ca423df4c87dd160a7208",
              "versionType": "git"
            },
            {
              "lessThan": "165613191ad9d034bf17c00e3a142f9561597ec5",
              "status": "affected",
              "version": "54007f818206dc27309ca423df4c87dd160a7208",
              "versionType": "git"
            },
            {
              "lessThan": "0c26202b157f1efc3cd2f26f5c30f59b508a6a5d",
              "status": "affected",
              "version": "54007f818206dc27309ca423df4c87dd160a7208",
              "versionType": "git"
            },
            {
              "lessThan": "3c58f641e813c3c71039f8fd4d4e2a3aab713288",
              "status": "affected",
              "version": "54007f818206dc27309ca423df4c87dd160a7208",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/userfaultfd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.153",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.153",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.105",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuserfaultfd: prevent registration of special VMAs\n\nVova Tokarev says:\n\n  userfaultfd allows registration on shadow stack VMAs.  With userfaultfd\n  access, you can register on the shadow stack, discard a page ... and\n  inject a page with chosen return addresses via UFFDIO_COPY.\n\nUpdate vma_can_userfault() to reject VM_SHADOW_STACK.\n\nWhile on it, also reject VM_SPECIAL so that if a driver would implement\nvm_uffd_ops, it wouldn\u0027t be possible to register special VMAs with\nuserfaultfd.\n\nSince VM_SPECIAL includes VM_DONTEXPAND which is set but hugetlb, exclude\nhugetlb VMAs from the check for VM_SPECIAL."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:02.309Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d974b4b786214883bd8e56bda10b454c80fd6205"
        },
        {
          "url": "https://git.kernel.org/stable/c/495a28d5a100be1b232633f4c2dcc42ba10b3796"
        },
        {
          "url": "https://git.kernel.org/stable/c/165613191ad9d034bf17c00e3a142f9561597ec5"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c26202b157f1efc3cd2f26f5c30f59b508a6a5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c58f641e813c3c71039f8fd4d4e2a3aab713288"
        }
      ],
      "title": "userfaultfd: prevent registration of special VMAs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68166",
    "datePublished": "2026-08-10T11:59:34.576Z",
    "dateReserved": "2026-07-30T09:28:09.372Z",
    "dateUpdated": "2026-08-23T12:46:02.309Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}