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

Vulnerability from cvelistv5 – Published: 2026-10-23 12:03 – Updated: 2026-10-23 12:05
VLAI
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
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ded86da4bbb78cad74cecc368fee3ae3a296e2ca , < c664cca8f622e66bea6a94279ae2611f1d1c0c67 (git)
Affected: ded86da4bbb78cad74cecc368fee3ae3a296e2ca , < 7c9f391ec89cb621d7af375ace2eb9a6248e5b9d (git)
guessed Create a notification for this product.
Linux Linux Affected: 7.2
Unaffected: 0 , < 7.2 (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/ibm/emac/core.c"
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          "vendor": "Linux",
          "versions": [
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            }
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      "cpeApplicability": [
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          "nodes": [
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                  "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",
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      "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",
  "vulnerability-lookup:meta": {
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      "cve": {
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                "product": "Linux",
                "programFiles": [
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            ],
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        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-98922",
        "lastModified": "2026-10-23T13:17:12.840",
        "metrics": {},
        "published": "2026-10-23T13:17:12.840",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7c9f391ec89cb621d7af375ace2eb9a6248e5b9d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c664cca8f622e66bea6a94279ae2611f1d1c0c67"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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