CVE-2026-98562 (GCVE-0-2026-98562)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:18 – Updated: 2026-10-19 09:21
VLAI
Title
net: libwx: fix races in Tx timestamp handling
Summary
In the Linux kernel, the following vulnerability has been resolved: net: libwx: fix races in Tx timestamp handling wx->ptp_tx_skb is shared between the Tx path, the PTP auxiliary worker and the timestamp cleanup paths. The WX_STATE_PTP_TX_IN_PROGRESS bit prevents multiple Tx paths from submitting timestamp requests, but does not serialize the worker against cleanup. As a result, wx_ptp_clear_tx_timestamp() can free an skb after wx_ptp_tx_hwtstamp_work() has obtained its pointer. The worker may then pass the freed skb to skb_tstamp_tx() and release the same reference again. The cleanup path may also clear the in-progress bit while the worker is still processing the old skb. This allows the Tx path to publish a new skb which the worker can subsequently overwrite with NULL, leaking its reference. Add a dedicated spinlock to protect publication and consumption of the Tx timestamp skb. Detach the skb and clear the in-progress bit while holding the lock, then deliver the timestamp and release the skb after dropping it. Use the same locked cleanup in the quiesce path, but keep the detach there free of register accesses: quiesce runs during PCIe error recovery, where MMIO is not reliable, and it deliberately did not touch the device before. The lock is taken with interrupts disabled, because netpoll can call ndo_start_xmit() with hard interrupts already off. When handling a Tx DMA mapping failure, keep the transmit path reference until after comparing the skb under the lock. This prevents skb address reuse from making the error path mistake a newer timestamp request for the failed one.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 06e75161b9d4833518a7c266310a0635eab50616 , < e78b95cfd5df25d0c562aaef95d3c7fe6c7e0e66 (git)
Affected: 06e75161b9d4833518a7c266310a0635eab50616 , < 3173cba1170131816972ed2b6185cb970ba8b747 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/wangxun/libwx/wx_hw.c",
            "drivers/net/ethernet/wangxun/libwx/wx_lib.c",
            "drivers/net/ethernet/wangxun/libwx/wx_ptp.c",
            "drivers/net/ethernet/wangxun/libwx/wx_type.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e78b95cfd5df25d0c562aaef95d3c7fe6c7e0e66",
              "status": "affected",
              "version": "06e75161b9d4833518a7c266310a0635eab50616",
              "versionType": "git"
            },
            {
              "lessThan": "3173cba1170131816972ed2b6185cb970ba8b747",
              "status": "affected",
              "version": "06e75161b9d4833518a7c266310a0635eab50616",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/wangxun/libwx/wx_hw.c",
            "drivers/net/ethernet/wangxun/libwx/wx_lib.c",
            "drivers/net/ethernet/wangxun/libwx/wx_ptp.c",
            "drivers/net/ethernet/wangxun/libwx/wx_type.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: libwx: fix races in Tx timestamp handling\n\nwx-\u003eptp_tx_skb is shared between the Tx path, the PTP auxiliary\nworker and the timestamp cleanup paths. The\nWX_STATE_PTP_TX_IN_PROGRESS bit prevents multiple Tx paths from\nsubmitting timestamp requests, but does not serialize the worker\nagainst cleanup.\n\nAs a result, wx_ptp_clear_tx_timestamp() can free an skb after\nwx_ptp_tx_hwtstamp_work() has obtained its pointer. The worker may\nthen pass the freed skb to skb_tstamp_tx() and release the same\nreference again.\n\nThe cleanup path may also clear the in-progress bit while the worker\nis still processing the old skb. This allows the Tx path to publish a\nnew skb which the worker can subsequently overwrite with NULL,\nleaking its reference.\n\nAdd a dedicated spinlock to protect publication and consumption of\nthe Tx timestamp skb. Detach the skb and clear the in-progress bit\nwhile holding the lock, then deliver the timestamp and release the skb\nafter dropping it. Use the same locked cleanup in the quiesce path,\nbut keep the detach there free of register accesses: quiesce runs\nduring PCIe error recovery, where MMIO is not reliable, and it\ndeliberately did not touch the device before. The lock is taken with\ninterrupts disabled, because netpoll can call ndo_start_xmit() with\nhard interrupts already off.\n\nWhen handling a Tx DMA mapping failure, keep the transmit path\nreference until after comparing the skb under the lock. This prevents\nskb address reuse from making the error path mistake a newer timestamp\nrequest for the failed one."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:21:46.397Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e78b95cfd5df25d0c562aaef95d3c7fe6c7e0e66"
        },
        {
          "url": "https://git.kernel.org/stable/c/3173cba1170131816972ed2b6185cb970ba8b747"
        }
      ],
      "title": "net: libwx: fix races in Tx timestamp handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98562",
    "datePublished": "2026-10-18T15:18:29.310Z",
    "dateReserved": "2026-09-25T10:25:14.357Z",
    "dateUpdated": "2026-10-19T09:21:46.397Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-10-27",
      "epss": "0.00189",
      "percentile": "0.08508"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:39:59.000Z",
      "cve": "CVE-2026-98562",
      "id": "msrc_CVE-2026-98562",
      "initial_release_date": "2026-10-20T22:23:47.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: libwx: fix races in Tx timestamp handling",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98562.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/wangxun/libwx/wx_hw.c",
                  "drivers/net/ethernet/wangxun/libwx/wx_lib.c",
                  "drivers/net/ethernet/wangxun/libwx/wx_ptp.c",
                  "drivers/net/ethernet/wangxun/libwx/wx_type.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
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                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/wangxun/libwx/wx_hw.c",
                  "drivers/net/ethernet/wangxun/libwx/wx_lib.c",
                  "drivers/net/ethernet/wangxun/libwx/wx_ptp.c",
                  "drivers/net/ethernet/wangxun/libwx/wx_type.h"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                  },
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                    "versionType": "semver"
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                    "versionType": "semver"
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                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: libwx: fix races in Tx timestamp handling\n\nwx-\u003eptp_tx_skb is shared between the Tx path, the PTP auxiliary\nworker and the timestamp cleanup paths. The\nWX_STATE_PTP_TX_IN_PROGRESS bit prevents multiple Tx paths from\nsubmitting timestamp requests, but does not serialize the worker\nagainst cleanup.\n\nAs a result, wx_ptp_clear_tx_timestamp() can free an skb after\nwx_ptp_tx_hwtstamp_work() has obtained its pointer. The worker may\nthen pass the freed skb to skb_tstamp_tx() and release the same\nreference again.\n\nThe cleanup path may also clear the in-progress bit while the worker\nis still processing the old skb. This allows the Tx path to publish a\nnew skb which the worker can subsequently overwrite with NULL,\nleaking its reference.\n\nAdd a dedicated spinlock to protect publication and consumption of\nthe Tx timestamp skb. Detach the skb and clear the in-progress bit\nwhile holding the lock, then deliver the timestamp and release the skb\nafter dropping it. Use the same locked cleanup in the quiesce path,\nbut keep the detach there free of register accesses: quiesce runs\nduring PCIe error recovery, where MMIO is not reliable, and it\ndeliberately did not touch the device before. The lock is taken with\ninterrupts disabled, because netpoll can call ndo_start_xmit() with\nhard interrupts already off.\n\nWhen handling a Tx DMA mapping failure, keep the transmit path\nreference until after comparing the skb under the lock. This prevents\nskb address reuse from making the error path mistake a newer timestamp\nrequest for the failed one."
          }
        ],
        "id": "CVE-2026-98562",
        "lastModified": "2026-10-19T10:19:12.813",
        "metrics": {},
        "published": "2026-10-18T16:17:08.347",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3173cba1170131816972ed2b6185cb970ba8b747"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e78b95cfd5df25d0c562aaef95d3c7fe6c7e0e66"
          }
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        "vulnStatus": "Received"
      }
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      "current_release_date": "2026-10-20T02:26:24+00:00",
      "cve": "CVE-2026-98562",
      "id": "CVE-2026-98562",
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      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: libwx: fix races in Tx timestamp handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98562.json",
      "version": "3"
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      "current_release_date": "2026-10-22T16:36:51Z",
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      "id": "CVE-2026-98562",
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      "product_status:known_affected": "0",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98562",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98562.json",
      "version": "2"
    }
  }
}



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