FKIE_CVE-2026-89482

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-10-19 09:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone Commit 25e5cb780e62 ("nvme-tcp: fix possible crash in write_zeroes processing") established that blk_rq_payload_bytes() must not be read without first checking blk_rq_nr_phys_segments(), and recorded the result in nvme_tcp_setup_cmd_pdu() as req->data_len. The receive side was left as it was. The two differ for REQ_OP_WRITE_ZEROES, which has no physical segments but a non-zero blk_rq_bytes(), so setup leaves req->iter untouched while the receive gate lets a C2HData through and nvme_tcp_recv_data() copies into whatever the previous command on that tag left there. The driver-private area is zeroed only when the tag set is allocated. Reproduced with a test target that leaves a residual iterator on a tag and then sends a C2HData for a WRITE_ZEROES command on the same tag: BUG: KASAN: wild-memory-access in _copy_to_iter+0x642/0x1330 Write of size 512 at addr ffe728c2175dfa81 by task kworker/0:1H/103 CPU: 0 UID: 0 PID: 103 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy) 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 Workqueue: nvme_tcp_wq nvme_tcp_io_work Call Trace: <TASK> dump_stack_lvl+0x53/0x70 kasan_report+0xce/0x100 ? _copy_to_iter+0x642/0x1330 kasan_check_range+0x105/0x1b0 __asan_memcpy+0x3c/0x60 _copy_to_iter+0x642/0x1330 ? __pfx_sock_has_perm+0x10/0x10 ? worker_thread+0x45b/0xd10 ? __pfx__copy_to_iter+0x10/0x10 ? _raw_spin_lock_bh+0x83/0xe0 ? __pfx__raw_spin_lock_bh+0x10/0x10 __skb_datagram_iter+0xf3/0x820 ? __pfx_simple_copy_to_iter+0x10/0x10 ? __asan_memcpy+0x3c/0x60 ? skb_copy_bits+0x58d/0x830 skb_copy_datagram_iter+0x37/0x120 nvme_tcp_recv_skb+0xa07/0x4320 ? __pfx_nvme_tcp_recv_skb+0x10/0x10 __tcp_read_sock+0x1ab/0x810 ? __pfx_nvme_tcp_recv_skb+0x10/0x10 ? __pfx_lock_sock_nested+0x10/0x10 ? __pfx___tcp_read_sock+0x10/0x10 nvme_tcp_try_recv+0x152/0x1e0 ? __pfx_nvme_tcp_try_recv+0x10/0x10 ? __pfx_mutex_unlock+0x10/0x10 nvme_tcp_io_work+0x1e4/0x6c0 ? __schedule+0x181a/0x49f0 ? __pfx_nvme_tcp_io_work+0x10/0x10 process_one_work+0x633/0x1030 Keep the blk_rq_payload_bytes() test and add req->data_len to it. The old test is what rejects a C2HData naming a tag that is no longer in flight, because blk_update_request() zeroes rq->__data_len on completion; req->data_len and req->curr_bio are driver-private and survive completion, so they cannot stand in for it. Setup initialises the iterator only when both req->curr_bio and req->data_len are set, so the gate now tests the same two.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32ea8ce96b9bd797c59c351ce490ffd97adaa8c0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/641ad3a30ba560f0a9a610376c568d7b75d2a2aa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a01b58263108eaf9869bb6f82f07709240c6589
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ed0b61bbc145988be292c4d3ec580aebd8d2bcd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b36161701cb366f416afdcf70771d432a7c74753
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "32ea8ce96b9bd797c59c351ce490ffd97adaa8c0",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "7ed0b61bbc145988be292c4d3ec580aebd8d2bcd",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "b36161701cb366f416afdcf70771d432a7c74753",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "6a01b58263108eaf9869bb6f82f07709240c6589",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "641ad3a30ba560f0a9a610376c568d7b75d2a2aa",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "lessThan": "3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36",
              "status": "affected",
              "version": "25e5cb780e62bde432b401f312bb847edc78b432",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f507ae6e33cbe56c4e3fe000434fc0ecc263d098",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b1458c16f4e26e87492e58e4d24a1873bd09232a",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.36",
              "versionType": "semver"
            },
            {
              "lessThan": "5.7",
              "status": "affected",
              "version": "5.6.8",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "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",
              "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-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone\n\nCommit 25e5cb780e62 (\"nvme-tcp: fix possible crash in write_zeroes\nprocessing\") established that blk_rq_payload_bytes() must not be read\nwithout first checking blk_rq_nr_phys_segments(), and recorded the\nresult in nvme_tcp_setup_cmd_pdu() as req-\u003edata_len. The receive side\nwas left as it was.\n\nThe two differ for REQ_OP_WRITE_ZEROES, which has no physical segments\nbut a non-zero blk_rq_bytes(), so setup leaves req-\u003eiter untouched\nwhile the receive gate lets a C2HData through and nvme_tcp_recv_data()\ncopies into whatever the previous command on that tag left there. The\ndriver-private area is zeroed only when the tag set is allocated.\n\nReproduced with a test target that leaves a residual iterator on a tag\nand then sends a C2HData for a WRITE_ZEROES command on the same tag:\n\nBUG: KASAN: wild-memory-access in _copy_to_iter+0x642/0x1330\nWrite of size 512 at addr ffe728c2175dfa81 by task kworker/0:1H/103\n\nCPU: 0 UID: 0 PID: 103 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\nHardware 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\nWorkqueue: nvme_tcp_wq nvme_tcp_io_work\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x53/0x70\n kasan_report+0xce/0x100\n ? _copy_to_iter+0x642/0x1330\n kasan_check_range+0x105/0x1b0\n __asan_memcpy+0x3c/0x60\n _copy_to_iter+0x642/0x1330\n ? __pfx_sock_has_perm+0x10/0x10\n ? worker_thread+0x45b/0xd10\n ? __pfx__copy_to_iter+0x10/0x10\n ? _raw_spin_lock_bh+0x83/0xe0\n ? __pfx__raw_spin_lock_bh+0x10/0x10\n __skb_datagram_iter+0xf3/0x820\n ? __pfx_simple_copy_to_iter+0x10/0x10\n ? __asan_memcpy+0x3c/0x60\n ? skb_copy_bits+0x58d/0x830\n skb_copy_datagram_iter+0x37/0x120\n nvme_tcp_recv_skb+0xa07/0x4320\n ? __pfx_nvme_tcp_recv_skb+0x10/0x10\n __tcp_read_sock+0x1ab/0x810\n ? __pfx_nvme_tcp_recv_skb+0x10/0x10\n ? __pfx_lock_sock_nested+0x10/0x10\n ? __pfx___tcp_read_sock+0x10/0x10\n nvme_tcp_try_recv+0x152/0x1e0\n ? __pfx_nvme_tcp_try_recv+0x10/0x10\n ? __pfx_mutex_unlock+0x10/0x10\n nvme_tcp_io_work+0x1e4/0x6c0\n ? __schedule+0x181a/0x49f0\n ? __pfx_nvme_tcp_io_work+0x10/0x10\n process_one_work+0x633/0x1030\n\nKeep the blk_rq_payload_bytes() test and add req-\u003edata_len to it. The\nold test is what rejects a C2HData naming a tag that is no longer in\nflight, because blk_update_request() zeroes rq-\u003e__data_len on\ncompletion; req-\u003edata_len and req-\u003ecurr_bio are driver-private and\nsurvive completion, so they cannot stand in for it. Setup initialises\nthe iterator only when both req-\u003ecurr_bio and req-\u003edata_len are set, so\nthe gate now tests the same two."
    }
  ],
  "id": "CVE-2026-89482",
  "lastModified": "2026-10-19T09:17:41.540",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-89482",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T19:22:37.965026Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-11T20:19:29.730",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/32ea8ce96b9bd797c59c351ce490ffd97adaa8c0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3a4aa9e6ad3e35f8e24d5eaf38ee4d437075fb36"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/641ad3a30ba560f0a9a610376c568d7b75d2a2aa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6a01b58263108eaf9869bb6f82f07709240c6589"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ed0b61bbc145988be292c4d3ec580aebd8d2bcd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b36161701cb366f416afdcf70771d432a7c74753"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b96e1ff75e5c0ad6e077ac002b1d30b0a2b49528"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd8906bb8f8d5bf1c9f861e1382c82b87bfe7cab"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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