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CVE-2026-46149

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() target_tg_pt_gp_members_show() formats LUN paths with snprintf() into a 256-byte stack buffer, then will memcpy() cur_len bytes from that buffer. snprintf() returns the length the output would have had, which can exceed the buffer size when the fabric WWN is long because iSCSI IQN names can be up to 223 bytes. The check at the memcpy() site only guards the destination page write, not the source read, so memcpy() will read past the stack buffer and copy adjacent stack contents to the sysfs reader, which when CONFIG_FORTIFY_SOURCE is enabled, fortify_panic() will be triggered. Commit 27e06650a5ea ("scsi: target: target_core_configfs: Add length check to avoid buffer overflow") added the same bound to the target_lu_gp_members_show() but the tg_pt_gp variant was missed so resolve that here.

Severity
HIGH
CVSS score
7.1 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-28 10:16:30.513000
Last modified
2026-10-19 20:18:35.093000
View original CVE JSON 
{
  "id": "CVE-2026-46149",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-28T10:16:30.513",
  "lastModified": "2026-10-19T20:18:35.093",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()\n\ntarget_tg_pt_gp_members_show() formats LUN paths with snprintf() into a\n256-byte stack buffer, then will memcpy() cur_len bytes from that\nbuffer.  snprintf() returns the length the output would have had, which\ncan exceed the buffer size when the fabric WWN is long because iSCSI IQN\nnames can be up to 223 bytes.  The check at the memcpy() site only\nguards the destination page write, not the source read, so memcpy() will\nread past the stack buffer and copy adjacent stack contents to the sysfs\nreader, which when CONFIG_FORTIFY_SOURCE is enabled, fortify_panic()\nwill be triggered.\n\nCommit 27e06650a5ea (\"scsi: target: target_core_configfs: Add length\ncheck to avoid buffer overflow\") added the same bound to the\ntarget_lu_gp_members_show() but the tg_pt_gp variant was missed so\nresolve that here."
    }
  ],
  "affected": [
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      "affectedData": [
        {
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          "product": "Linux",
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          "programFiles": [
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          ],
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "affectedData": [
        {
          "vendor": "Siemens",
          "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "0",
              "lessThan": "*",
              "versionType": "custom",
              "status": "affected"
            }
          ]
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  ],
  "metrics": {
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        "cvssData": {
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
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        "exploitabilityScore": 1.8,
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    "ssvcV203": [
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        "ssvcData": {
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          "id": "CVE-2026-46149",
          "options": [
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            },
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          "role": "CISA Coordinator",
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  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
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          "value": "CWE-674"
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      "type": "Secondary",
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          "value": "CWE-126"
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  "configurations": [
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          "negate": false,
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}