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FKIE_CVE-2026-89483

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme: zero the discard fallback page nvme_setup_discard() always maps sizeof(struct nvme_dsm_range) * NVME_DSM_MAX_RANGES = 4096 bytes as the DSM payload however many ranges the command declares, because some devices ignore the 'Number of Ranges' field - the Fixes: commit records two that read past the declared ranges. A single-range discard fills only the first 16 bytes. Normally the buffer comes from kzalloc() and the other 4080 bytes are zero. When that allocation fails the code falls back to the per-controller ctrl->discard_page, which nvme_init_ctrl() obtains with alloc_page(GFP_KERNEL) and nothing ever zeroes, so those 4080 bytes are whatever the page last held and are handed to the controller. Reaching it requires the kzalloc(GFP_ATOMIC | __GFP_NOWARN) to fail, that is memory pressure; it is not remotely triggerable. Failing the allocation under KMSAN reproduces it, with the leaked tail full of vmemmap struct page pointers. The extent in the report is a partial transfer of the payload, not the whole 4096 bytes; the 16-byte boundary in it is the one declared range: [ 11.991601] BUG: KMSAN: uninit-value in dma_map_phys+0x14c8/0x1900 [ 11.991969] dma_map_phys+0x14c8/0x1900 [ 11.992220] dma_map_page_attrs+0xcf/0x130 [ 11.992485] e1000_xmit_frame+0x4099/0x6d10 [ 11.992768] dev_hard_start_xmit+0x22f/0xa80 [ 11.993068] sch_direct_xmit+0x35c/0xcb0 [ 11.993315] __dev_queue_xmit+0x1ee5/0x5eb0 [ 11.993608] ip_finish_output2+0x1903/0x1c30 [ 11.993881] ip_finish_output+0x288/0x870 [ 11.994125] ip_output+0x15e/0x400 [ 11.994365] __ip_queue_xmit+0x1e85/0x1fb0 [ 11.994639] ip_queue_xmit+0x60/0x80 [ 11.994899] __tcp_transmit_skb+0x4e71/0x5fa0 [ 11.995210] tcp_write_xmit+0x3a36/0x9160 [ 11.995533] __tcp_push_pending_frames+0xc5/0x3c0 [ 11.995854] tcp_push+0x7dc/0x840 [ 11.996076] tcp_sendmsg_locked+0x766c/0x8400 [ 11.996371] tcp_sendmsg+0x4b/0x90 [ 11.996572] inet_sendmsg+0x134/0x2a0 [ 11.996823] __sock_sendmsg+0x265/0x360 [ 11.997076] sock_sendmsg+0x100/0x1e0 [ 11.997293] nvme_tcp_try_send+0x196f/0x6370 [ 11.997605] nvme_tcp_queue_rq+0x1d54/0x20b0 [ 11.997882] blk_mq_dispatch_rq_list+0x5ee/0x2e50 [ 11.998175] __blk_mq_sched_dispatch_requests+0x16dc/0x24a0 [ 11.998539] blk_mq_sched_dispatch_requests+0x11b/0x2c0 [ 11.998865] blk_mq_run_work_fn+0x13b/0x280 [ 11.999146] process_scheduled_works+0x966/0x1ad0 [ 11.999465] worker_thread+0xe44/0x1480 [ 11.999709] kthread+0x53b/0x600 [ 11.999927] ret_from_fork+0x29f/0x7c0 [ 12.000191] ret_from_fork_asm+0x1a/0x30 [ 12.000460] [ 12.000558] Uninit was created at: [ 12.000788] __alloc_frozen_pages_noprof+0x8bf/0xd30 [ 12.001096] alloc_pages_mpol+0x1d0/0x5f0 [ 12.001326] alloc_pages_noprof+0x102/0x290 [ 12.001627] nvme_init_ctrl+0x5a3/0x9f0 [ 12.001891] nvme_tcp_create_ctrl+0xd75/0x19b0 [ 12.002170] nvmf_dev_write+0x4c68/0x4fd0 [ 12.002426] vfs_write+0x587/0x1a10 [ 12.002636] __x64_sys_write+0x207/0x4f0 [ 12.002874] x64_sys_call+0x2ff0/0x3ea0 [ 12.003123] do_syscall_64+0x147/0x3b0 [ 12.003400] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.003680] [ 12.003777] Bytes 16-2843 of 2844 are uninitialized [ 12.004068] Memory access of size 2844 starts at ffff888109f82000 [ 12.004412] [ 12.004530] CPU: 0 UID: 0 PID: 101 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMECTL-gf5098b6bae76 #1 PREEMPT(lazy) [ 12.005127] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.005762] Workqueue: kblockd blk_mq_run_work_fn [ 12.006073] ===================================================== Allocate the page with __GFP_ZERO. The single allocation site covers every use of it: bytes no discard has written stay zero, and bytes one did write hold that controller's own range list, which it has already been sent.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f84d2bd0d8ae8c7e8e0f8fc3cbf018a282971a1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/415f2772ebcbc7f3f1ab1a71915dab82cee3465e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/66b5af23b6f956e57f8205c46aa80b054631be34
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67551d8430df94c827e1830bd3a5fae1f66a5219
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/76139b5bbf531e675934b97227be3521c7fdd537
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bededeaaeff404978a5a8e2a605a6c3017cddd3e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dc4d4b70a863f7e39ef8bd137634be4e6db8b084
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f5827817b4fc7feeabf4f53fb4b626e6edc52fef
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "76139b5bbf531e675934b97227be3521c7fdd537",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "3f84d2bd0d8ae8c7e8e0f8fc3cbf018a282971a1",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "415f2772ebcbc7f3f1ab1a71915dab82cee3465e",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "66b5af23b6f956e57f8205c46aa80b054631be34",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "dc4d4b70a863f7e39ef8bd137634be4e6db8b084",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "67551d8430df94c827e1830bd3a5fae1f66a5219",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "f5827817b4fc7feeabf4f53fb4b626e6edc52fef",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "lessThan": "bededeaaeff404978a5a8e2a605a6c3017cddd3e",
              "status": "affected",
              "version": "530436c45ef2e446c12538a400e465929a0b3ade",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ffa56cbdd2409b522b4cb56461bea1c45889417b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8b0acb768a06083b0d28bace1481c1f6679e76f4",
              "versionType": "git"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.92",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nnvme: zero the discard fallback page\n\nnvme_setup_discard() always maps sizeof(struct nvme_dsm_range) *\nNVME_DSM_MAX_RANGES = 4096 bytes as the DSM payload however many ranges\nthe command declares, because some devices ignore the \u0027Number of Ranges\u0027\nfield - the Fixes: commit records two that read past the declared ranges.\nA single-range discard fills only the first 16 bytes.\n\nNormally the buffer comes from kzalloc() and the other 4080 bytes are\nzero.  When that allocation fails the code falls back to the\nper-controller ctrl-\u003ediscard_page, which nvme_init_ctrl() obtains with\nalloc_page(GFP_KERNEL) and nothing ever zeroes, so those 4080 bytes are\nwhatever the page last held and are handed to the controller.  Reaching\nit requires the kzalloc(GFP_ATOMIC | __GFP_NOWARN) to fail, that is\nmemory pressure; it is not remotely triggerable.  Failing the allocation\nunder KMSAN reproduces it, with the leaked tail full of vmemmap struct\npage pointers.  The extent in the report is a partial transfer of the\npayload, not the whole 4096 bytes; the 16-byte boundary in it is the one\ndeclared range:\n\n[   11.991601] BUG: KMSAN: uninit-value in dma_map_phys+0x14c8/0x1900\n[   11.991969]  dma_map_phys+0x14c8/0x1900\n[   11.992220]  dma_map_page_attrs+0xcf/0x130\n[   11.992485]  e1000_xmit_frame+0x4099/0x6d10\n[   11.992768]  dev_hard_start_xmit+0x22f/0xa80\n[   11.993068]  sch_direct_xmit+0x35c/0xcb0\n[   11.993315]  __dev_queue_xmit+0x1ee5/0x5eb0\n[   11.993608]  ip_finish_output2+0x1903/0x1c30\n[   11.993881]  ip_finish_output+0x288/0x870\n[   11.994125]  ip_output+0x15e/0x400\n[   11.994365]  __ip_queue_xmit+0x1e85/0x1fb0\n[   11.994639]  ip_queue_xmit+0x60/0x80\n[   11.994899]  __tcp_transmit_skb+0x4e71/0x5fa0\n[   11.995210]  tcp_write_xmit+0x3a36/0x9160\n[   11.995533]  __tcp_push_pending_frames+0xc5/0x3c0\n[   11.995854]  tcp_push+0x7dc/0x840\n[   11.996076]  tcp_sendmsg_locked+0x766c/0x8400\n[   11.996371]  tcp_sendmsg+0x4b/0x90\n[   11.996572]  inet_sendmsg+0x134/0x2a0\n[   11.996823]  __sock_sendmsg+0x265/0x360\n[   11.997076]  sock_sendmsg+0x100/0x1e0\n[   11.997293]  nvme_tcp_try_send+0x196f/0x6370\n[   11.997605]  nvme_tcp_queue_rq+0x1d54/0x20b0\n[   11.997882]  blk_mq_dispatch_rq_list+0x5ee/0x2e50\n[   11.998175]  __blk_mq_sched_dispatch_requests+0x16dc/0x24a0\n[   11.998539]  blk_mq_sched_dispatch_requests+0x11b/0x2c0\n[   11.998865]  blk_mq_run_work_fn+0x13b/0x280\n[   11.999146]  process_scheduled_works+0x966/0x1ad0\n[   11.999465]  worker_thread+0xe44/0x1480\n[   11.999709]  kthread+0x53b/0x600\n[   11.999927]  ret_from_fork+0x29f/0x7c0\n[   12.000191]  ret_from_fork_asm+0x1a/0x30\n[   12.000460]\n[   12.000558] Uninit was created at:\n[   12.000788]  __alloc_frozen_pages_noprof+0x8bf/0xd30\n[   12.001096]  alloc_pages_mpol+0x1d0/0x5f0\n[   12.001326]  alloc_pages_noprof+0x102/0x290\n[   12.001627]  nvme_init_ctrl+0x5a3/0x9f0\n[   12.001891]  nvme_tcp_create_ctrl+0xd75/0x19b0\n[   12.002170]  nvmf_dev_write+0x4c68/0x4fd0\n[   12.002426]  vfs_write+0x587/0x1a10\n[   12.002636]  __x64_sys_write+0x207/0x4f0\n[   12.002874]  x64_sys_call+0x2ff0/0x3ea0\n[   12.003123]  do_syscall_64+0x147/0x3b0\n[   12.003400]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[   12.003680]\n[   12.003777] Bytes 16-2843 of 2844 are uninitialized\n[   12.004068] Memory access of size 2844 starts at ffff888109f82000\n[   12.004412]\n[   12.004530] CPU: 0 UID: 0 PID: 101 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMECTL-gf5098b6bae76 #1 PREEMPT(lazy)\n[   12.005127] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   12.005762] Workqueue: kblockd blk_mq_run_work_fn\n[   12.006073] =====================================================\n\nAllocate the page with __GFP_ZERO.  The single allocation site covers\nevery use of it: bytes no discard has written stay zero, and bytes one\ndid write hold that controller\u0027s own range list, which it has already\nbeen sent."
    }
  ],
  "id": "CVE-2026-89483",
  "lastModified": "2026-09-14T13:19:05.107",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-11T20:19:29.880",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f84d2bd0d8ae8c7e8e0f8fc3cbf018a282971a1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/415f2772ebcbc7f3f1ab1a71915dab82cee3465e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/66b5af23b6f956e57f8205c46aa80b054631be34"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67551d8430df94c827e1830bd3a5fae1f66a5219"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/76139b5bbf531e675934b97227be3521c7fdd537"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bededeaaeff404978a5a8e2a605a6c3017cddd3e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dc4d4b70a863f7e39ef8bd137634be4e6db8b084"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f5827817b4fc7feeabf4f53fb4b626e6edc52fef"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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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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Nomenclature

  • 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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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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