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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Open-code GGTT MMIO access protection\n\nGGTT MMIO access is currently protected by hotplug (drm_dev_enter),\nwhich works correctly when the driver loads successfully and is later\nunbound or unloaded. However, if driver load fails, this protection is\ninsufficient because drm_dev_unplug() is never called.\n\nAdditionally, devm release functions cannot guarantee that all BOs with\nGGTT mappings are destroyed before the GGTT MMIO region is removed, as\nsome BOs may be freed asynchronously by worker threads.\n\nTo address this, introduce an open-coded flag, protected by the GGTT\nlock, that guards GGTT MMIO access. The flag is cleared during the\ndev_fini_ggtt devm release function to ensure MMIO access is disabled\nonce teardown begins.\n\n(cherry picked from commit 4f3a998a173b4325c2efd90bdadc6ccd3ad9a431)"
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              "value": "AV:L - The vulnerable GGTT removal path is in the local Intel xe DRM driver teardown/probe-failure path, reached through local device/driver activity rather than network or adjacent input.\nAC:L - Once a probe-failure or teardown window exists with GGTT-mapped BO cleanup pending, the stale MMIO access follows from deterministic cleanup ordering; repeated local attempts can trigger the condition.\nPR:L - The path is local and tied to DRM/driver resources; although forcing probe failure may require stronger controls in some deployments, local DRM access and cleanup are involved, so Low is the higher defensible choice under the uncertainty rule.\nUI:N - No separate victim action is required after the local attacker triggers the driver/probe/cleanup sequence.\nS:U - The impact remains within the local kernel/driver security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - The bug is stale GGTT MMIO access after teardown, a use-after-unmap style memory corruption condition; under the required overestimation rule, such corruption is treated as potentially enabling broader kernel information disclosure.\nI:H - The vulnerable operation writes GGTT PTEs through a stale MMIO mapping after it may have been removed, so it can plausibly corrupt kernel or device state and is scored as high integrity impact.\nA:H - The observed failure mode is a kernel page fault/oops in `xe_ggtt_set_pte()` from `ggtt_node_remove_work_func()`, causing a kernel crash or severe availability loss."
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          "url": "https://git.kernel.org/stable/c/01f2557aa684e514005541e71a3d01f4cd45c170"
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      "title": "drm/xe: Open-code GGTT MMIO access protection",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: always keep track of remap prev/next\n\nDuring 3D workload, user is reporting hitting:\n\n[  413.361679] WARNING: drivers/gpu/drm/xe/xe_vm.c:1217 at vm_bind_ioctl_ops_unwind+0x1e2/0x2e0 [xe], CPU#7: vkd3d_queue/9925\n[  413.361944] CPU: 7 UID: 1000 PID: 9925 Comm: vkd3d_queue Kdump: loaded Not tainted 7.0.0-070000rc3-generic #202603090038 PREEMPT(lazy)\n[  413.361949] RIP: 0010:vm_bind_ioctl_ops_unwind+0x1e2/0x2e0 [xe]\n[  413.362074] RSP: 0018:ffffd4c25c3df930 EFLAGS: 00010282\n[  413.362077] RAX: 0000000000000000 RBX: ffff8f3ee817ed10 RCX: 0000000000000000\n[  413.362078] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n[  413.362079] RBP: ffffd4c25c3df980 R08: 0000000000000000 R09: 0000000000000000\n[  413.362081] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8f41fbf99380\n[  413.362082] R13: ffff8f3ee817e968 R14: 00000000ffffffef R15: ffff8f43d00bd380\n[  413.362083] FS:  00000001040ff6c0(0000) GS:ffff8f4696d89000(0000) knlGS:00000000330b0000\n[  413.362085] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033\n[  413.362086] CR2: 00007ddfc4747000 CR3: 00000002e6262005 CR4: 0000000000f72ef0\n[  413.362088] PKRU: 55555554\n[  413.362089] Call Trace:\n[  413.362092]  \u003cTASK\u003e\n[  413.362096]  xe_vm_bind_ioctl+0xa9a/0xc60 [xe]\n\nWhich seems to hint that the vma we are re-inserting for the ops unwind\nis either invalid or overlapping with something already inserted in the\nvm. It shouldn\u0027t be invalid since this is a re-insertion, so must have\nworked before. Leaving the likely culprit as something already placed\nwhere we want to insert the vma.\n\nFollowing from that, for the case where we do something like a rebind in\nthe middle of a vma, and one or both mapped ends are already compatible,\nwe skip doing the rebind of those vma and set next/prev to NULL. As well\nas then adjust the original unmap va range, to avoid unmapping the ends.\nHowever, if we trigger the unwind path, we end up with three va, with\nthe two ends never being removed and the original va range in the middle\nstill being the shrunken size.\n\nIf this occurs, one failure mode is when another unwind op needs to\ninteract with that range, which can happen with a vector of binds. For\nexample, if we need to re-insert something in place of the original va.\nIn this case the va is still the shrunken version, so when removing it\nand then doing a re-insert it can overlap with the ends, which were\nnever removed, triggering a warning like above, plus leaving the vm in a\nbad state.\n\nWith that, we need two things here:\n\n 1) Stop nuking the prev/next tracking for the skip cases. Instead\n    relying on checking for skip prev/next, where needed. That way on the\n    unwind path, we now correctly remove both ends.\n\n 2) Undo the unmap va shrinkage, on the unwind path. With the two ends\n    now removed the unmap va should expand back to the original size again,\n    before re-insertion.\n\nv2:\n  - Update the explanation in the commit message, based on an actual IGT of\n    triggering this issue, rather than conjecture.\n  - Also undo the unmap shrinkage, for the skip case. With the two ends\n    now removed, the original unmap va range should expand back to the\n    original range.\nv3:\n  - Track the old start/range separately. vma_size/start() uses the va\n    info directly.\n\n(cherry picked from commit aec6969f75afbf4e01fd5fb5850ed3e9c27043ac)"
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              "value": "AV:L - The vulnerable path is reached through the local DRM_XE_VM_BIND ioctl on the Intel xe render device, not by network or adjacent protocols.\nAC:L - An attacker can craft VM bind vectors that create the remap skip condition and then force the unwind path through later bind failures or resource pressure. The race/trigger conditions are under the local caller\u0027s control.\nPR:L - The ioctl is DRM_RENDER_ALLOW and requires access to the xe DRM render device, which is available to ordinary local render clients without real root or CAP_SYS_ADMIN.\nUI:N - Once the attacker has local device access, exploitation is performed entirely by issuing ioctls and does not require another user to take action.\nS:U - The bug corrupts kernel/driver VM bookkeeping within the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary by itself.\nC:H - The unwind bug can leave VMA objects and GPUVA tree/list state inconsistent, creating stale or untracked kernel objects with incorrect lifetime relationships. Given this memory-management corruption, kernel memory disclosure is a plausible high-impact outcome.\nI:H - The same inconsistent VMA bookkeeping can lead to stale mappings, invalid removals, or use-after-free style behavior in later VM/BO operations. This is a kernel memory-safety condition that can plausibly be leveraged for arbitrary corruption or code execution.\nA:H - The observed failure reaches a kernel WARN in xe_vm_insert_vma and leaves the VM in a bad state, which can crash or panic systems configured to panic on warnings and can be repeatedly triggered by a local caller."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: smbdirect: introduce smbdirect_socket.recv_io.credits.available\n\nThe logic off managing recv credits by counting posted recv_io and\ngranted credits is racy.\n\nThat\u0027s because the peer might already consumed a credit,\nbut between receiving the incoming recv at the hardware\nand processing the completion in the \u0027recv_done\u0027 functions\nwe likely have a window where we grant credits, which\ndon\u0027t really exist.\n\nSo we better have a decicated counter for the\navailable credits, which will be incremented\nwhen we posted new recv buffers and drained when\nwe grant the credits to the peer."
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              "value": "AV:N - SMBDirect is reached by a remote RDMA peer through RDMA CM listeners on SMBDirect/SMB ports such as 5445 and 445. The ksmbd server path processes the affected negotiation and data-transfer credit handling from network-originated RDMA messages.\nAC:L - The issue is a receive-credit accounting race, but the remote peer can repeatedly drive both message arrival and credit-request/response behavior with crafted SMBDirect traffic. No unusual victim state or uncontrollable condition is required beyond an enabled SMBDirect RDMA deployment.\nPR:N - The server-side path accepts the RDMA connection and performs SMBDirect negotiation and data-transfer credit handling before SMB session authentication. A remote peer does not need SMB credentials to reach the vulnerable credit logic.\nUI:N - Exploitation against the server path requires only network/RDMA traffic from the attacker. No local user or administrator action is needed after the service is exposed.\nS:U - The impact remains within the kernel SMBDirect/SMB service security authority. There is no VM escape, IOMMU bypass, or cross-authority boundary crossing.\nC:N - The bug overgrants receive credits but does not expose a kernel read primitive; incoming payload bounds are checked before reassembly. An RDMA send without a posted receive should produce transport/RNR failure rather than disclose memory.\nI:N - The investigation did not identify an arbitrary write or memory-corruption primitive. The false credit causes receive-queue/transport state inconsistency, not attacker-controlled modification of kernel data.\nA:H - False credits can allow the peer to send when no real receive buffer is posted, causing RDMA QP/transport errors and SMBDirect disconnects with RNR retries disabled. Because this is remotely and unauthenticatedly repeatable against the exposed SMBDirect service, availability impact is high."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/gt: fix refcount underflow in intel_engine_park_heartbeat\n\nA use-after-free / refcount underflow is possible when the heartbeat\nworker and intel_engine_park_heartbeat() race to release the same\nengine-\u003eheartbeat.systole request.\n\nThe heartbeat worker reads engine-\u003eheartbeat.systole and calls\ni915_request_put() on it when the request is complete, but clears\nthe pointer in a separate, non-atomic step. Concurrently, a request\nretirement on another CPU can drop the engine wakeref to zero, triggering\n__engine_park() -\u003e intel_engine_park_heartbeat(). If the heartbeat\ntimer is pending at that point, cancel_delayed_work() returns true and\nintel_engine_park_heartbeat() reads the stale non-NULL systole pointer\nand calls i915_request_put() on it again, causing a refcount underflow:\n\n```\n\u003c4\u003e [487.221889] Workqueue: i915-unordered engine_retire [i915]\n\u003c4\u003e [487.222640] RIP: 0010:refcount_warn_saturate+0x68/0xb0\n...\n\u003c4\u003e [487.222707] Call Trace:\n\u003c4\u003e [487.222711]  \u003cTASK\u003e\n\u003c4\u003e [487.222716]  intel_engine_park_heartbeat.part.0+0x6f/0x80 [i915]\n\u003c4\u003e [487.223115]  intel_engine_park_heartbeat+0x25/0x40 [i915]\n\u003c4\u003e [487.223566]  __engine_park+0xb9/0x650 [i915]\n\u003c4\u003e [487.223973]  ____intel_wakeref_put_last+0x2e/0xb0 [i915]\n\u003c4\u003e [487.224408]  __intel_wakeref_put_last+0x72/0x90 [i915]\n\u003c4\u003e [487.224797]  intel_context_exit_engine+0x7c/0x80 [i915]\n\u003c4\u003e [487.225238]  intel_context_exit+0xf1/0x1b0 [i915]\n\u003c4\u003e [487.225695]  i915_request_retire.part.0+0x1b9/0x530 [i915]\n\u003c4\u003e [487.226178]  i915_request_retire+0x1c/0x40 [i915]\n\u003c4\u003e [487.226625]  engine_retire+0x122/0x180 [i915]\n\u003c4\u003e [487.227037]  process_one_work+0x239/0x760\n\u003c4\u003e [487.227060]  worker_thread+0x200/0x3f0\n\u003c4\u003e [487.227068]  ? __pfx_worker_thread+0x10/0x10\n\u003c4\u003e [487.227075]  kthread+0x10d/0x150\n\u003c4\u003e [487.227083]  ? __pfx_kthread+0x10/0x10\n\u003c4\u003e [487.227092]  ret_from_fork+0x3d4/0x480\n\u003c4\u003e [487.227099]  ? __pfx_kthread+0x10/0x10\n\u003c4\u003e [487.227107]  ret_from_fork_asm+0x1a/0x30\n\u003c4\u003e [487.227141]  \u003c/TASK\u003e\n```\n\nFix this by replacing the non-atomic pointer read + separate clear with\nxchg() in both racing paths. xchg() is a single indivisible hardware\ninstruction that atomically reads the old pointer and writes NULL. This\nguarantees only one of the two concurrent callers obtains the non-NULL\npointer and performs the put, the other gets NULL and skips it.\n\n(cherry picked from commit 13238dc0ee4f9ab8dafa2cca7295736191ae2f42)"
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              "value": "AV:L - The vulnerable path is reached locally through i915 DRM render ioctls such as execbuffer submission, not through network or adjacent protocols.\nAC:L - Although the bug is a race, an attacker with render access can repeatedly drive GPU request submission, heartbeat creation, completion, retirement, and engine parking to trigger it.\nPR:L - The relevant ioctl is DRM_RENDER_ALLOW and does not require CAP_SYS_ADMIN or DRM master, but the attacker needs local access to an i915 render device as an unprivileged render client.\nUI:N - No victim action is required once the attacker can issue DRM ioctls and submit GPU work.\nS:U - The impact remains within the kernel/driver security authority; this is not a VM escape or cross-scope boundary bypass.\nC:H - The stale i915_request pointer can become a use-after-free on a reused request object, and per the required kernel scoring guidance UAFs are treated as enabling high confidentiality impact.\nI:H - The double put/refcount underflow can corrupt request/fence lifetime state and create a UAF condition, which is defensibly exploitable for arbitrary kernel memory manipulation.\nA:H - The observed failure reaches refcount_warn_saturate from the engine park path and can produce a kernel warning/oops or crash; repeated triggering can deny service."
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.130",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.78",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.19",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.9",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915: Fix potential overflow of shmem scatterlist length\n\nWhen a scatterlists table of a GEM shmem object of size 4 GB or more is\npopulated with pages allocated from a folio, unsigned int .length\nattribute of a scatterlist may get overflowed if total byte length of\npages allocated to that single scatterlist happens to reach or cross the\n4GB limit.  As a consequence, users of the object may suffer from hitting\nunexpected, premature end of the object\u0027s backing pages.\n\n[278.780187] ------------[ cut here ]------------\n[278.780377] WARNING: CPU: 1 PID: 2326 at drivers/gpu/drm/i915/i915_mm.c:55 remap_sg+0x199/0x1d0 [i915]\n...\n[278.780654] CPU: 1 UID: 0 PID: 2326 Comm: gem_mmap_offset Tainted: G S   U              6.17.0-rc1-CI_DRM_16981-ged823aaa0607+ #1 PREEMPT(voluntary)\n[278.780656] Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER\n[278.780658] Hardware name: Intel Corporation Meteor Lake Client Platform/MTL-P LP5x T3 RVP, BIOS MTLPFWI1.R00.3471.D91.2401310918 01/31/2024\n[278.780659] RIP: 0010:remap_sg+0x199/0x1d0 [i915]\n...\n[278.780786] Call Trace:\n[278.780787]  \u003cTASK\u003e\n[278.780788]  ? __apply_to_page_range+0x3e6/0x910\n[278.780795]  ? __pfx_remap_sg+0x10/0x10 [i915]\n[278.780906]  apply_to_page_range+0x14/0x30\n[278.780908]  remap_io_sg+0x14d/0x260 [i915]\n[278.781013]  vm_fault_cpu+0xd2/0x330 [i915]\n[278.781137]  __do_fault+0x3a/0x1b0\n[278.781140]  do_fault+0x322/0x640\n[278.781143]  __handle_mm_fault+0x938/0xfd0\n[278.781150]  handle_mm_fault+0x12c/0x300\n[278.781152]  ? lock_mm_and_find_vma+0x4b/0x760\n[278.781155]  do_user_addr_fault+0x2d6/0x8e0\n[278.781160]  exc_page_fault+0x96/0x2c0\n[278.781165]  asm_exc_page_fault+0x27/0x30\n...\n\nThat issue was apprehended by the author of a change that introduced it,\nand potential risk even annotated with a comment, but then never addressed.\n\nWhen adding folio pages to a scatterlist table, take care of byte length\nof any single scatterlist not exceeding max_segment.\n\n(cherry picked from commit 06249b4e691a75694c014a61708c007fb5755f60)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable i915 GEM shmem path is reached through local DRM ioctls and mmap faults on an i915 render device, not via network or adjacent protocols.\nAC:L - An attacker can create a large GEM object and fault/bind it through normal i915 paths; there is no race or victim-controlled timing requirement, and uncertainty about allocator state is scored toward the higher-severity low-complexity value.\nPR:L - The relevant GEM create and mmap ioctls are marked DRM_RENDER_ALLOW and are reachable by a local user with render-node access, without CAP_SYS_ADMIN or DRM master privileges.\nUI:N - No victim action is required after the attacker has local access to the DRM device; the attacker triggers object creation, page population, and mmap/GPU use directly.\nS:U - The impact remains within the kernel/i915 security authority and does not cross a VM, IOMMU, or separate administrative boundary by itself.\nC:H - The overflow corrupts scatterlist length metadata for a user-controlled large object, and later i915 CPU/GPU mapping paths can consume the truncated table and potentially walk/use attacker-groomable scatterlist metadata. Under the required uncertainty rule, this is treated as a high-impact kernel/GPU memory disclosure primitive.\nI:H - The malformed scatterlist can feed GPU page-table or remapping paths with incorrect DMA addresses, plausibly allowing writes through GPU mappings to unintended memory. Under the required uncertainty rule, this is treated as high integrity impact.\nA:H - At minimum the bug can cause premature scatterlist termination leading to kernel warnings/errors, BUG/OOPS-class failures, GPU faults, hangs, or very large unreleased backing-page leaks when triggered repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:31.468Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aeb7255531ba4a5c3a64938577170d08b78de399"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c956f0fccc26fefcbb507516c49d1db41c40471"
        },
        {
          "url": "https://git.kernel.org/stable/c/eae4bf4107571283031db96ce132e951615e2ae4"
        },
        {
          "url": "https://git.kernel.org/stable/c/21a301f12d18797bf889c15497f922edfdaece3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/029ae067431ab9d0fca479bdabe780fa436706ea"
        }
      ],
      "title": "drm/i915: Fix potential overflow of shmem scatterlist length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43368",
    "datePublished": "2026-05-08T14:21:20.500Z",
    "dateReserved": "2026-05-01T14:12:56.005Z",
    "dateUpdated": "2026-08-05T12:27:31.468Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}