Vulnerability-Lookup

CVE-2026-89973 (GCVE-0-2026-89973)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 14:40

Title

nvme-tcp: check the data direction of a C2HData PDU

Summary

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: check the data direction of a C2HData PDU nvme_tcp_handle_c2h_data() finds the request by command id and checks that it has a payload, but it does not check that the command asked for data to be read. A controller that answers a write command with C2HData therefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits WARN_ON_ONCE(i->data_source) and returns 0. The receive path turns that into -EFAULT and resets the controller. No data is copied, so this is not memory corruption. What a controller gets is a kernel warning it can raise at will, which is fatal on a host booted with panic_on_warn. The send path already knows the direction - it consults rq_data_dir() when it builds a command - and nvme_tcp_handle_r2t() checks the length and the offset of the request it names. The C2HData path does not check the direction at all. Reject a C2HData PDU whose command is not a read. Rejecting it fails the command and resets the controller, as the neighbouring check in this function does; what goes away is the warning. [ 6.885580] ------------[ cut here ]------------ [ 6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71 [ 6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy) [ 6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work [ 6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330 [ 6.903739] Call Trace: [ 6.904085] <TASK> [ 6.909254] __skb_datagram_iter+0x433/0x820 [ 6.911026] skb_copy_datagram_iter+0x37/0x120 [ 6.911622] nvme_tcp_recv_skb+0xa07/0x4320 [ 6.913378] __tcp_read_sock+0x1ab/0x810 [ 6.915788] nvme_tcp_try_recv+0x152/0x1e0 [ 6.918222] nvme_tcp_io_work+0x1e4/0x6c0 [ 6.926906] </TASK> [ 6.927226] ---[ end trace 0000000000000000 ]--- [ 6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data [ 6.928709] nvme nvme0: receive failed: -14

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/df74950ba6008655d…
https://git.kernel.org/stable/c/980d990f3c0560d7d…
https://git.kernel.org/stable/c/5b115d932f6e769ac…
https://git.kernel.org/stable/c/0673a2affe45ca76b…
https://git.kernel.org/stable/c/80d56202fbdff8906…
https://git.kernel.org/stable/c/b4af7999a998787d5…
https://git.kernel.org/stable/c/a0c389b8a495bda1e…
https://git.kernel.org/stable/c/f83af377c148f6ad9…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < df74950ba6008655d4a977d17df7faf4b6e52b74 (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < 980d990f3c0560d7dfbfbf14699651fdf02f26ee (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < 5b115d932f6e769ac80783fb18edd21b0aed256e (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < 0673a2affe45ca76b60de31a83c67b1e60f81bde (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < 80d56202fbdff8906be6954b2776e5c14a4026f2 (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < b4af7999a998787d5eb6facb5a333e04a4f1d2d9 (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < a0c389b8a495bda1eb719d2503853c924b7a8355 (git) Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < f83af377c148f6ad94b41c0e8313f12adf45e1c1 (git)	guessed
Linux	Linux	Affected: 5.0 Unaffected: 0 , < 5.0 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)	guessed

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "980d990f3c0560d7dfbfbf14699651fdf02f26ee",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "5b115d932f6e769ac80783fb18edd21b0aed256e",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "0673a2affe45ca76b60de31a83c67b1e60f81bde",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "80d56202fbdff8906be6954b2776e5c14a4026f2",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "b4af7999a998787d5eb6facb5a333e04a4f1d2d9",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "a0c389b8a495bda1eb719d2503853c924b7a8355",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "f83af377c148f6ad94b41c0e8313f12adf45e1c1",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "5.0"
            },
            {
              "lessThan": "5.0",
              "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": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc2",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: check the data direction of a C2HData PDU\n\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\nthat it has a payload, but it does not check that the command asked for\ndata to be read.  A controller that answers a write command with C2HData\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\nWARN_ON_ONCE(i-\u003edata_source) and returns 0.  The receive path turns that\ninto -EFAULT and resets the controller.\n\nNo data is copied, so this is not memory corruption.  What a controller\ngets is a kernel warning it can raise at will, which is fatal on a host\nbooted with panic_on_warn.\n\nThe send path already knows the direction - it consults rq_data_dir()\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\nand the offset of the request it names.  The C2HData path does not check\nthe direction at all.\n\nReject a C2HData PDU whose command is not a read.  Rejecting it fails\nthe command and resets the controller, as the neighbouring check in this\nfunction does; what goes away is the warning.\n\n  [    6.885580] ------------[ cut here ]------------\n  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\n  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\n  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\n  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\n  [    6.903739] Call Trace:\n  [    6.904085]  \u003cTASK\u003e\n  [    6.909254]  __skb_datagram_iter+0x433/0x820\n  [    6.911026]  skb_copy_datagram_iter+0x37/0x120\n  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320\n  [    6.913378]  __tcp_read_sock+0x1ab/0x810\n  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0\n  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0\n  [    6.926906]  \u003c/TASK\u003e\n  [    6.927226] ---[ end trace 0000000000000000 ]---\n  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\n  [    6.928709] nvme nvme0: receive failed:  -14"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The nvme-tcp host receive path (nvme_tcp_data_ready -\u003e nvme_tcp_try_recv -\u003e nvme_tcp_recv_skb -\u003e nvme_tcp_handle_c2h_data) parses C2HData PDUs from a remote NVMe/TCP target over routable TCP (typically port 4420); a malicious or compromised target, or an on-path injector into the default-unencrypted stream, triggers the bug from the network.\nAC:L - A malicious controller that replies to any in-flight write-direction command with a well-formed C2HData PDU always hits WARN_ON_ONCE(i-\u003edata_source) in _copy_to_iter; writes occur from writeback, discards, and init-time Set Features. No race, special memory layout, or rare config beyond CONFIG_NVME_TCP is required.\nPR:N - NVMe/TCP authentication (TLS and DH-HMAC-CHAP) is optional and off by default, so the connected fabric peer needs no credentials or privileges on the victim host; it simply answers I/O the host is already sending.\nUI:N - No victim action is required at exploit time; once the host is connected (including nvmf-autoconnect at boot), ordinary writeback, journal I/O, and controller-init Set Features with a data buffer issue write-direction commands that the malicious target answers with C2HData.\nS:U - The WARN splat, NVMe controller reset, and any panic_on_warn crash remain inside the host kernel. This is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:L - WARN_ON_ONCE in _copy_to_iter calls __warn()/dump_stack(), disclosing kernel text addresses in dmesg. No data is copied (the write iterator is ITER_SOURCE and copy_to_iter returns 0), so there is no use-after-free or arbitrary kernel read.\nI:N - The receive path turns the failed copy into -EFAULT and resets the controller; _copy_to_iter returns 0 without writing, so there is no memory corruption, write primitive, or control-flow hijack.\nA:H - The reporter reproduced WARNING in _copy_to_iter from nvme_tcp_io_work, which panics hosts with panic_on_warn or warn_limit. Independently, every C2HData-for-write returns -EFAULT and runs nvme_tcp_error_recovery(), so a malicious target can repeatedly take down NVMe-oF storage."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:40:55.074Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74"
        },
        {
          "url": "https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e"
        },
        {
          "url": "https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde"
        },
        {
          "url": "https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355"
        },
        {
          "url": "https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1"
        }
      ],
      "title": "nvme-tcp: check the data direction of a C2HData PDU",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89973",
    "datePublished": "2026-09-16T10:32:52.409Z",
    "dateReserved": "2026-09-11T19:38:34.779Z",
    "dateUpdated": "2026-09-16T14:40:55.074Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89973\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:08.057\",\"lastModified\":\"2026-09-16T15:18:21.747\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnvme-tcp: check the data direction of a C2HData PDU\\n\\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\\nthat it has a payload, but it does not check that the command asked for\\ndata to be read.  A controller that answers a write command with C2HData\\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\\nWARN_ON_ONCE(i-\u003edata_source) and returns 0.  The receive path turns that\\ninto -EFAULT and resets the controller.\\n\\nNo data is copied, so this is not memory corruption.  What a controller\\ngets is a kernel warning it can raise at will, which is fatal on a host\\nbooted with panic_on_warn.\\n\\nThe send path already knows the direction - it consults rq_data_dir()\\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\\nand the offset of the request it names.  The C2HData path does not check\\nthe direction at all.\\n\\nReject a C2HData PDU whose command is not a read.  Rejecting it fails\\nthe command and resets the controller, as the neighbouring check in this\\nfunction does; what goes away is the warning.\\n\\n  [    6.885580] ------------[ cut here ]------------\\n  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\\n  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\\n  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\\n  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\\n  [    6.903739] Call Trace:\\n  [    6.904085]  \u003cTASK\u003e\\n  [    6.909254]  __skb_datagram_iter+0x433/0x820\\n  [    6.911026]  skb_copy_datagram_iter+0x37/0x120\\n  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320\\n  [    6.913378]  __tcp_read_sock+0x1ab/0x810\\n  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0\\n  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0\\n  [    6.926906]  \u003c/TASK\u003e\\n  [    6.927226] ---[ end trace 0000000000000000 ]---\\n  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\\n  [    6.928709] nvme nvme0: receive failed:  -14\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/nvme/host/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"df74950ba6008655d4a977d17df7faf4b6e52b74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"980d990f3c0560d7dfbfbf14699651fdf02f26ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"5b115d932f6e769ac80783fb18edd21b0aed256e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"0673a2affe45ca76b60de31a83c67b1e60f81bde\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"80d56202fbdff8906be6954b2776e5c14a4026f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"b4af7999a998787d5eb6facb5a333e04a4f1d2d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"a0c389b8a495bda1eb719d2503853c924b7a8355\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3f2304f8c6d6ed97849057bd16fee99e434ca796\",\"lessThan\":\"f83af377c148f6ad94b41c0e8313f12adf45e1c1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/nvme/host/tcp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.51\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.5\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-89973

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 15:18

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1

Impacted products

	Vendor	Product	Version

JSON

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": "df74950ba6008655d4a977d17df7faf4b6e52b74",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "980d990f3c0560d7dfbfbf14699651fdf02f26ee",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "5b115d932f6e769ac80783fb18edd21b0aed256e",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "0673a2affe45ca76b60de31a83c67b1e60f81bde",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "80d56202fbdff8906be6954b2776e5c14a4026f2",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "b4af7999a998787d5eb6facb5a333e04a4f1d2d9",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "a0c389b8a495bda1eb719d2503853c924b7a8355",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            },
            {
              "lessThan": "f83af377c148f6ad94b41c0e8313f12adf45e1c1",
              "status": "affected",
              "version": "3f2304f8c6d6ed97849057bd16fee99e434ca796",
              "versionType": "git"
            }
          ]
        },
        {
          "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": "5.0"
            },
            {
              "lessThan": "5.0",
              "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": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "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: check the data direction of a C2HData PDU\n\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\nthat it has a payload, but it does not check that the command asked for\ndata to be read.  A controller that answers a write command with C2HData\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\nWARN_ON_ONCE(i-\u003edata_source) and returns 0.  The receive path turns that\ninto -EFAULT and resets the controller.\n\nNo data is copied, so this is not memory corruption.  What a controller\ngets is a kernel warning it can raise at will, which is fatal on a host\nbooted with panic_on_warn.\n\nThe send path already knows the direction - it consults rq_data_dir()\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\nand the offset of the request it names.  The C2HData path does not check\nthe direction at all.\n\nReject a C2HData PDU whose command is not a read.  Rejecting it fails\nthe command and resets the controller, as the neighbouring check in this\nfunction does; what goes away is the warning.\n\n  [    6.885580] ------------[ cut here ]------------\n  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\n  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\n  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\n  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\n  [    6.903739] Call Trace:\n  [    6.904085]  \u003cTASK\u003e\n  [    6.909254]  __skb_datagram_iter+0x433/0x820\n  [    6.911026]  skb_copy_datagram_iter+0x37/0x120\n  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320\n  [    6.913378]  __tcp_read_sock+0x1ab/0x810\n  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0\n  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0\n  [    6.926906]  \u003c/TASK\u003e\n  [    6.927226] ---[ end trace 0000000000000000 ]---\n  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\n  [    6.928709] nvme nvme0: receive failed:  -14"
    }
  ],
  "id": "CVE-2026-89973",
  "lastModified": "2026-09-16T15:18:21.747",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-16T11:17:08.057",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-9393-XPW8-3983

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

nvme-tcp: check the data direction of a C2HData PDU

nvme_tcp_handle_c2h_data() finds the request by command id and checks that it has a payload, but it does not check that the command asked for data to be read. A controller that answers a write command with C2HData therefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits WARN_ON_ONCE(i->data_source) and returns 0. The receive path turns that into -EFAULT and resets the controller.

No data is copied, so this is not memory corruption. What a controller gets is a kernel warning it can raise at will, which is fatal on a host booted with panic_on_warn.

The send path already knows the direction - it consults rq_data_dir() when it builds a command - and nvme_tcp_handle_r2t() checks the length and the offset of the request it names. The C2HData path does not check the direction at all.

Reject a C2HData PDU whose command is not a read. Rejecting it fails the command and resets the controller, as the neighbouring check in this function does; what goes away is the warning.

[ 6.885580] ------------[ cut here ]------------ [ 6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71 [ 6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy) [ 6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work [ 6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330 [ 6.903739] Call Trace: [ 6.904085] [ 6.909254] __skb_datagram_iter+0x433/0x820 [ 6.911026] skb_copy_datagram_iter+0x37/0x120 [ 6.911622] nvme_tcp_recv_skb+0xa07/0x4320 [ 6.913378] __tcp_read_sock+0x1ab/0x810 [ 6.915788] nvme_tcp_try_recv+0x152/0x1e0 [ 6.918222] nvme_tcp_io_work+0x1e4/0x6c0 [ 6.926906] [ 6.927226] ---[ end trace 0000000000000000 ]--- [ 6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data [ 6.928709] nvme nvme0: receive failed: -14

Severity

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89973"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:08Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: check the data direction of a C2HData PDU\n\nnvme_tcp_handle_c2h_data() finds the request by command id and checks\nthat it has a payload, but it does not check that the command asked for\ndata to be read.  A controller that answers a write command with C2HData\ntherefore reaches nvme_tcp_recv_data(), where _copy_to_iter() hits\nWARN_ON_ONCE(i-\u003edata_source) and returns 0.  The receive path turns that\ninto -EFAULT and resets the controller.\n\nNo data is copied, so this is not memory corruption.  What a controller\ngets is a kernel warning it can raise at will, which is fatal on a host\nbooted with panic_on_warn.\n\nThe send path already knows the direction - it consults rq_data_dir()\nwhen it builds a command - and nvme_tcp_handle_r2t() checks the length\nand the offset of the request it names.  The C2HData path does not check\nthe direction at all.\n\nReject a C2HData PDU whose command is not a read.  Rejecting it fails\nthe command and resets the controller, as the neighbouring check in this\nfunction does; what goes away is the warning.\n\n  [    6.885580] ------------[ cut here ]------------\n  [    6.886457] WARNING: lib/iov_iter.c:193 at _copy_to_iter+0x289/0x1330, CPU#0: kworker/0:1H/71\n  [    6.888137] CPU: 0 UID: 0 PID: 71 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMETCP-gf5098b6bae76 #1 PREEMPT(lazy)\n  [    6.891165] Workqueue: nvme_tcp_wq nvme_tcp_io_work\n  [    6.891875] RIP: 0010:_copy_to_iter+0x289/0x1330\n  [    6.903739] Call Trace:\n  [    6.904085]  \u003cTASK\u003e\n  [    6.909254]  __skb_datagram_iter+0x433/0x820\n  [    6.911026]  skb_copy_datagram_iter+0x37/0x120\n  [    6.911622]  nvme_tcp_recv_skb+0xa07/0x4320\n  [    6.913378]  __tcp_read_sock+0x1ab/0x810\n  [    6.915788]  nvme_tcp_try_recv+0x152/0x1e0\n  [    6.918222]  nvme_tcp_io_work+0x1e4/0x6c0\n  [    6.926906]  \u003c/TASK\u003e\n  [    6.927226] ---[ end trace 0000000000000000 ]---\n  [    6.927878] nvme nvme0: queue 1 failed to copy request 0x71 data\n  [    6.928709] nvme nvme0: receive failed:  -14",
  "id": "GHSA-9393-xpw8-3983",
  "modified": "2026-09-16T15:31:03Z",
  "published": "2026-09-16T12:30:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89973"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0673a2affe45ca76b60de31a83c67b1e60f81bde"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b115d932f6e769ac80783fb18edd21b0aed256e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80d56202fbdff8906be6954b2776e5c14a4026f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/980d990f3c0560d7dfbfbf14699651fdf02f26ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0c389b8a495bda1eb719d2503853c924b7a8355"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4af7999a998787d5eb6facb5a333e04a4f1d2d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df74950ba6008655d4a977d17df7faf4b6e52b74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f83af377c148f6ad94b41c0e8313f12adf45e1c1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-89973 (GCVE-0-2026-89973)

FKIE_CVE-2026-89973

GHSA-9393-XPW8-3983

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