Vulnerability-Lookup

GHSA-X8Q8-QWC9-FPG3

Vulnerability from github – Published: 2026-10-23 15:31 – Updated: 2026-10-23 15:31

Details

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

net: emac: move setting of netops to fix crash

fixes the following crash on driver initialization:

|BUG: Kernel NULL pointer dereference on read at 0x00000158 |Faulting instruction address: 0xc0566b40 |Oops: Kernel access of bad area, sig: 11 [#1] |BE PAGE_SIZE=4K PowerPC 44x Platform |Modules linked in: |CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: GW 7.3.0-rc3+ #1 |Tainted: [W]=WARN |Hardware name: MyBook Live APM821XX 0x12c41c83 PowerPC 44x Platform |NIP: c0566b40 LR: c05648f8 CTR: c04c1e9c |REGS: c1053a20 TRAP: 0300 Tainted: GW (7.3.0-rc3+) |MSR: 0002b000 CR: 24008808 XER: 00000000 |DEAR: 00000158 ESR: 00000000 |GPR00: c05648f8 c1053b10 c1063600 c1030000 c5ab3000 00000000 [...] |GPR08: 00000002 00000000 00000000 c1053b40 84002808 00000000 [...] |GPR16: cfffd210 00000002 c0beafcc cfffc960 00000000 c1030644 [...] |GPR24: c0beafbc c1037000 00000000 0000000a 00000000 c1030000 [...] |NIP [c0566b40] phy_link_topo_add_phy+0x2c/0x1d0 |LR [c05648f8] phy_attach_direct+0x1a4/0x368 |Call Trace: |[c1053b10] [c0811e04] klist_put+0x54/0xb4 (unreliable) |[c1053b40] [c05648f8] phy_attach_direct+0x1a4/0x368 |[c1053b70] [c0564ae8] phy_connect_direct+0x2c/0x60 |[c1053b90] [c056c7a8] of_phy_connect+0x50/0x74 |[c1053bc0] [c0572a88] emac_probe+0xd50/0x119c |[c1053c90] [c04cb770] platform_probe+0x74/0xa4 |[c1053cb0] [c04c8f08] really_probe+0x120/0x2b0 |[c1053cd0] [c04c9254] __driver_probe_device+0x1bc/0x1fc |[c1053d00] [c04c9334] driver_probe_device+0x38/0xa8 |[c1053d30] [c04c9560] __driver_attach+0xf4/0x10c |[c1053d50] [c04c6af8] bus_for_each_dev+0x68/0xd0 |[c1053d90] [c04c7c34] bus_add_driver+0xcc/0x1ec |[c1053dc0] [c04c9f6c] driver_register+0xcc/0x110 |[c1053de0] [c0aa3f40] emac_init+0x1c4/0x200

This bug showed up starting with v7.3-rc1. At the NIP in phy_link_topo_add_phy() is a netdev_need_ops_lock() check. This was added by the following commit ded86da4bbb7 ("net: ethtool: relax ethnl_req_get_phydev() locking assertion")

The bug shows up because at the time of_phy_connect() was called, the netdev_ops were not yet determined. My fix is to move the code that sets netdev_ops+commac.ops+ethtool_ops further up as emac_init_config() derives that by looking at the device-tree and sets the required dev->phy_mode accordingly.

During review, the Sashiko bot's AI stated that the commac assignment became a dead store. Great catch! To keep the original behavior as-is, one mentioned option "set dev->commac.ops = &emac_commac_ops only in the non-gige case?" sounded like a great plan. So the dev->commac.ops assignment for the non-gige-case moves into the else block.

This patch was tested on a WD MyBook Live (RGMII). the device now works again.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98922"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T13:17:12Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: emac: move setting of netops to fix crash\n\nfixes the following crash on driver initialization:\n\n|BUG: Kernel NULL pointer dereference on read at 0x00000158\n|Faulting instruction address: 0xc0566b40\n|Oops: Kernel access of bad area, sig: 11 [#1]\n|BE PAGE_SIZE=4K  PowerPC 44x Platform\n|Modules linked in:\n|CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: GW 7.3.0-rc3+ #1\n|Tainted: [W]=WARN\n|Hardware name: MyBook Live APM821XX 0x12c41c83 PowerPC 44x Platform\n|NIP:  c0566b40 LR: c05648f8 CTR: c04c1e9c\n|REGS: c1053a20 TRAP: 0300   Tainted: GW  (7.3.0-rc3+)\n|MSR:  0002b000 \u003cCE,EE,FP,ME\u003e  CR: 24008808  XER: 00000000\n|DEAR: 00000158 ESR: 00000000\n|GPR00: c05648f8 c1053b10 c1063600 c1030000 c5ab3000 00000000 [...]\n|GPR08: 00000002 00000000 00000000 c1053b40 84002808 00000000 [...]\n|GPR16: cfffd210 00000002 c0beafcc cfffc960 00000000 c1030644 [...]\n|GPR24: c0beafbc c1037000 00000000 0000000a 00000000 c1030000 [...]\n|NIP [c0566b40] phy_link_topo_add_phy+0x2c/0x1d0\n|LR [c05648f8] phy_attach_direct+0x1a4/0x368\n|Call Trace:\n|[c1053b10] [c0811e04] klist_put+0x54/0xb4 (unreliable)\n|[c1053b40] [c05648f8] phy_attach_direct+0x1a4/0x368\n|[c1053b70] [c0564ae8] phy_connect_direct+0x2c/0x60\n|[c1053b90] [c056c7a8] of_phy_connect+0x50/0x74\n|[c1053bc0] [c0572a88] emac_probe+0xd50/0x119c\n|[c1053c90] [c04cb770] platform_probe+0x74/0xa4\n|[c1053cb0] [c04c8f08] really_probe+0x120/0x2b0\n|[c1053cd0] [c04c9254] __driver_probe_device+0x1bc/0x1fc\n|[c1053d00] [c04c9334] driver_probe_device+0x38/0xa8\n|[c1053d30] [c04c9560] __driver_attach+0xf4/0x10c\n|[c1053d50] [c04c6af8] bus_for_each_dev+0x68/0xd0\n|[c1053d90] [c04c7c34] bus_add_driver+0xcc/0x1ec\n|[c1053dc0] [c04c9f6c] driver_register+0xcc/0x110\n|[c1053de0] [c0aa3f40] emac_init+0x1c4/0x200\n\nThis bug showed up starting with v7.3-rc1. At the NIP in\nphy_link_topo_add_phy() is a netdev_need_ops_lock() check.\nThis was added by the following\ncommit ded86da4bbb7 (\"net: ethtool: relax ethnl_req_get_phydev() locking assertion\")\n\nThe bug shows up because at the time of_phy_connect() was called, the\nnetdev_ops were *not yet* determined. My fix is to move the code that\nsets netdev_ops+commac.ops+ethtool_ops further up as emac_init_config()\nderives that by looking at the device-tree and sets the required\ndev-\u003ephy_mode accordingly.\n\nDuring review, the Sashiko bot\u0027s AI stated that the commac assignment\nbecame a dead store. Great catch! To keep the original behavior as-is,\none mentioned option \"set dev-\u003ecommac.ops = \u0026emac_commac_ops only in\nthe non-gige case?\" sounded like a great plan. So the dev-\u003ecommac.ops\nassignment for the non-gige-case moves into the else block.\n\nThis patch was tested on a WD MyBook Live (RGMII). the device now works again.",
  "id": "GHSA-x8q8-qwc9-fpg3",
  "modified": "2026-10-23T15:31:31Z",
  "published": "2026-10-23T15:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98922"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c9f391ec89cb621d7af375ace2eb9a6248e5b9d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c664cca8f622e66bea6a94279ae2611f1d1c0c67"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98922 (GCVE-0-2026-98922)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:03 – Updated: 2026-10-23 12:05

Title

net: emac: move setting of netops to fix crash

Summary

In the Linux kernel, the following vulnerability has been resolved: net: emac: move setting of netops to fix crash fixes the following crash on driver initialization: |BUG: Kernel NULL pointer dereference on read at 0x00000158 |Faulting instruction address: 0xc0566b40 |Oops: Kernel access of bad area, sig: 11 [#1] |BE PAGE_SIZE=4K PowerPC 44x Platform |Modules linked in: |CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: GW 7.3.0-rc3+ #1 |Tainted: [W]=WARN |Hardware name: MyBook Live APM821XX 0x12c41c83 PowerPC 44x Platform |NIP: c0566b40 LR: c05648f8 CTR: c04c1e9c |REGS: c1053a20 TRAP: 0300 Tainted: GW (7.3.0-rc3+) |MSR: 0002b000 <CE,EE,FP,ME> CR: 24008808 XER: 00000000 |DEAR: 00000158 ESR: 00000000 |GPR00: c05648f8 c1053b10 c1063600 c1030000 c5ab3000 00000000 [...] |GPR08: 00000002 00000000 00000000 c1053b40 84002808 00000000 [...] |GPR16: cfffd210 00000002 c0beafcc cfffc960 00000000 c1030644 [...] |GPR24: c0beafbc c1037000 00000000 0000000a 00000000 c1030000 [...] |NIP [c0566b40] phy_link_topo_add_phy+0x2c/0x1d0 |LR [c05648f8] phy_attach_direct+0x1a4/0x368 |Call Trace: |[c1053b10] [c0811e04] klist_put+0x54/0xb4 (unreliable) |[c1053b40] [c05648f8] phy_attach_direct+0x1a4/0x368 |[c1053b70] [c0564ae8] phy_connect_direct+0x2c/0x60 |[c1053b90] [c056c7a8] of_phy_connect+0x50/0x74 |[c1053bc0] [c0572a88] emac_probe+0xd50/0x119c |[c1053c90] [c04cb770] platform_probe+0x74/0xa4 |[c1053cb0] [c04c8f08] really_probe+0x120/0x2b0 |[c1053cd0] [c04c9254] __driver_probe_device+0x1bc/0x1fc |[c1053d00] [c04c9334] driver_probe_device+0x38/0xa8 |[c1053d30] [c04c9560] __driver_attach+0xf4/0x10c |[c1053d50] [c04c6af8] bus_for_each_dev+0x68/0xd0 |[c1053d90] [c04c7c34] bus_add_driver+0xcc/0x1ec |[c1053dc0] [c04c9f6c] driver_register+0xcc/0x110 |[c1053de0] [c0aa3f40] emac_init+0x1c4/0x200 This bug showed up starting with v7.3-rc1. At the NIP in phy_link_topo_add_phy() is a netdev_need_ops_lock() check. This was added by the following commit ded86da4bbb7 ("net: ethtool: relax ethnl_req_get_phydev() locking assertion") The bug shows up because at the time of_phy_connect() was called, the netdev_ops were *not yet* determined. My fix is to move the code that sets netdev_ops+commac.ops+ethtool_ops further up as emac_init_config() derives that by looking at the device-tree and sets the required dev->phy_mode accordingly. During review, the Sashiko bot's AI stated that the commac assignment became a dead store. Great catch! To keep the original behavior as-is, one mentioned option "set dev->commac.ops = &emac_commac_ops only in the non-gige case?" sounded like a great plan. So the dev->commac.ops assignment for the non-gige-case moves into the else block. This patch was tested on a WD MyBook Live (RGMII). the device now works again.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7061 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/c664cca8f622e66be…
https://git.kernel.org/stable/c/7c9f391ec89cb621d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ded86da4bbb78cad74cecc368fee3ae3a296e2ca , < c664cca8f622e66bea6a94279ae2611f1d1c0c67 (git) Affected: ded86da4bbb78cad74cecc368fee3ae3a296e2ca , < 7c9f391ec89cb621d7af375ace2eb9a6248e5b9d (git)
Linux	Linux	Affected: 7.2 Unaffected: 0 , < 7.2 (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ibm/emac/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c664cca8f622e66bea6a94279ae2611f1d1c0c67",
              "status": "affected",
              "version": "ded86da4bbb78cad74cecc368fee3ae3a296e2ca",
              "versionType": "git"
            },
            {
              "lessThan": "7c9f391ec89cb621d7af375ace2eb9a6248e5b9d",
              "status": "affected",
              "version": "ded86da4bbb78cad74cecc368fee3ae3a296e2ca",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ibm/emac/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "lessThan": "7.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: emac: move setting of netops to fix crash\n\nfixes the following crash on driver initialization:\n\n|BUG: Kernel NULL pointer dereference on read at 0x00000158\n|Faulting instruction address: 0xc0566b40\n|Oops: Kernel access of bad area, sig: 11 [#1]\n|BE PAGE_SIZE=4K  PowerPC 44x Platform\n|Modules linked in:\n|CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: GW 7.3.0-rc3+ #1\n|Tainted: [W]=WARN\n|Hardware name: MyBook Live APM821XX 0x12c41c83 PowerPC 44x Platform\n|NIP:  c0566b40 LR: c05648f8 CTR: c04c1e9c\n|REGS: c1053a20 TRAP: 0300   Tainted: GW  (7.3.0-rc3+)\n|MSR:  0002b000 \u003cCE,EE,FP,ME\u003e  CR: 24008808  XER: 00000000\n|DEAR: 00000158 ESR: 00000000\n|GPR00: c05648f8 c1053b10 c1063600 c1030000 c5ab3000 00000000 [...]\n|GPR08: 00000002 00000000 00000000 c1053b40 84002808 00000000 [...]\n|GPR16: cfffd210 00000002 c0beafcc cfffc960 00000000 c1030644 [...]\n|GPR24: c0beafbc c1037000 00000000 0000000a 00000000 c1030000 [...]\n|NIP [c0566b40] phy_link_topo_add_phy+0x2c/0x1d0\n|LR [c05648f8] phy_attach_direct+0x1a4/0x368\n|Call Trace:\n|[c1053b10] [c0811e04] klist_put+0x54/0xb4 (unreliable)\n|[c1053b40] [c05648f8] phy_attach_direct+0x1a4/0x368\n|[c1053b70] [c0564ae8] phy_connect_direct+0x2c/0x60\n|[c1053b90] [c056c7a8] of_phy_connect+0x50/0x74\n|[c1053bc0] [c0572a88] emac_probe+0xd50/0x119c\n|[c1053c90] [c04cb770] platform_probe+0x74/0xa4\n|[c1053cb0] [c04c8f08] really_probe+0x120/0x2b0\n|[c1053cd0] [c04c9254] __driver_probe_device+0x1bc/0x1fc\n|[c1053d00] [c04c9334] driver_probe_device+0x38/0xa8\n|[c1053d30] [c04c9560] __driver_attach+0xf4/0x10c\n|[c1053d50] [c04c6af8] bus_for_each_dev+0x68/0xd0\n|[c1053d90] [c04c7c34] bus_add_driver+0xcc/0x1ec\n|[c1053dc0] [c04c9f6c] driver_register+0xcc/0x110\n|[c1053de0] [c0aa3f40] emac_init+0x1c4/0x200\n\nThis bug showed up starting with v7.3-rc1. At the NIP in\nphy_link_topo_add_phy() is a netdev_need_ops_lock() check.\nThis was added by the following\ncommit ded86da4bbb7 (\"net: ethtool: relax ethnl_req_get_phydev() locking assertion\")\n\nThe bug shows up because at the time of_phy_connect() was called, the\nnetdev_ops were *not yet* determined. My fix is to move the code that\nsets netdev_ops+commac.ops+ethtool_ops further up as emac_init_config()\nderives that by looking at the device-tree and sets the required\ndev-\u003ephy_mode accordingly.\n\nDuring review, the Sashiko bot\u0027s AI stated that the commac assignment\nbecame a dead store. Great catch! To keep the original behavior as-is,\none mentioned option \"set dev-\u003ecommac.ops = \u0026emac_commac_ops only in\nthe non-gige case?\" sounded like a great plan. So the dev-\u003ecommac.ops\nassignment for the non-gige-case moves into the else block.\n\nThis patch was tested on a WD MyBook Live (RGMII). the device now works again."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:05:38.754Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c664cca8f622e66bea6a94279ae2611f1d1c0c67"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c9f391ec89cb621d7af375ace2eb9a6248e5b9d"
        }
      ],
      "title": "net: emac: move setting of netops to fix crash",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98922",
    "datePublished": "2026-10-23T12:03:02.790Z",
    "dateReserved": "2026-09-25T10:25:14.380Z",
    "dateUpdated": "2026-10-23T12:05:38.754Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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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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