cve-2024-50072
Vulnerability from cvelistv5
Published
2024-10-29 00:50
Modified
2024-12-19 09:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Use code segment selector for VERW operand Robert Gill reported below #GP in 32-bit mode when dosemu software was executing vm86() system call: general protection fault: 0000 [#1] PREEMPT SMP CPU: 4 PID: 4610 Comm: dosemu.bin Not tainted 6.6.21-gentoo-x86 #1 Hardware name: Dell Inc. PowerEdge 1950/0H723K, BIOS 2.7.0 10/30/2010 EIP: restore_all_switch_stack+0xbe/0xcf EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: ff8affdc DS: 0000 ES: 0000 FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046 CR0: 80050033 CR2: 00c2101c CR3: 04b6d000 CR4: 000406d0 Call Trace: show_regs+0x70/0x78 die_addr+0x29/0x70 exc_general_protection+0x13c/0x348 exc_bounds+0x98/0x98 handle_exception+0x14d/0x14d exc_bounds+0x98/0x98 restore_all_switch_stack+0xbe/0xcf exc_bounds+0x98/0x98 restore_all_switch_stack+0xbe/0xcf This only happens in 32-bit mode when VERW based mitigations like MDS/RFDS are enabled. This is because segment registers with an arbitrary user value can result in #GP when executing VERW. Intel SDM vol. 2C documents the following behavior for VERW instruction: #GP(0) - If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. CLEAR_CPU_BUFFERS macro executes VERW instruction before returning to user space. Use %cs selector to reference VERW operand. This ensures VERW will not #GP for an arbitrary user %ds. [ mingo: Fixed the SOB chain. ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38c5fe74f3bef98f75d16effa49836d50c9b6097
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/481b477ab63c7245715a3e57ba79eb87c2dc0d02Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ada431c6c31a2c8c37991c46089af5caa23a9c6e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc576fbaf82deded606e69a00efe9752136bf91dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bfd1d223d80cb29a210caa1bd5e21f0816d58f02
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e4d2102018542e3ae5e297bc6e229303abff8a0fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 6.8
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/nospec-branch.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bfd1d223d80cb29a210caa1bd5e21f0816d58f02",
              "status": "affected",
              "version": "50f021f0b985629accf10481a6e89af8b9700583",
              "versionType": "git"
            },
            {
              "lessThan": "ada431c6c31a2c8c37991c46089af5caa23a9c6e",
              "status": "affected",
              "version": "d54de9f2a127090f2017184e8257795b487d5312",
              "versionType": "git"
            },
            {
              "lessThan": "38c5fe74f3bef98f75d16effa49836d50c9b6097",
              "status": "affected",
              "version": "2e3087505ddb8ba2d3d4c81306cca11e868fcdb9",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "ca13d8cd8dac25558da4ee8df4dc70e8e7f9d762",
              "versionType": "git"
            },
            {
              "lessThan": "bc576fbaf82deded606e69a00efe9752136bf91d",
              "status": "affected",
              "version": "a0e2dab44d22b913b4c228c8b52b2a104434b0b3",
              "versionType": "git"
            },
            {
              "lessThan": "e4d2102018542e3ae5e297bc6e229303abff8a0f",
              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/nospec-branch.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.171",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.116",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/bugs: Use code segment selector for VERW operand\n\nRobert Gill reported below #GP in 32-bit mode when dosemu software was\nexecuting vm86() system call:\n\n  general protection fault: 0000 [#1] PREEMPT SMP\n  CPU: 4 PID: 4610 Comm: dosemu.bin Not tainted 6.6.21-gentoo-x86 #1\n  Hardware name: Dell Inc. PowerEdge 1950/0H723K, BIOS 2.7.0 10/30/2010\n  EIP: restore_all_switch_stack+0xbe/0xcf\n  EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000\n  ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: ff8affdc\n  DS: 0000 ES: 0000 FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046\n  CR0: 80050033 CR2: 00c2101c CR3: 04b6d000 CR4: 000406d0\n  Call Trace:\n   show_regs+0x70/0x78\n   die_addr+0x29/0x70\n   exc_general_protection+0x13c/0x348\n   exc_bounds+0x98/0x98\n   handle_exception+0x14d/0x14d\n   exc_bounds+0x98/0x98\n   restore_all_switch_stack+0xbe/0xcf\n   exc_bounds+0x98/0x98\n   restore_all_switch_stack+0xbe/0xcf\n\nThis only happens in 32-bit mode when VERW based mitigations like MDS/RFDS\nare enabled. This is because segment registers with an arbitrary user value\ncan result in #GP when executing VERW. Intel SDM vol. 2C documents the\nfollowing behavior for VERW instruction:\n\n  #GP(0) - If a memory operand effective address is outside the CS, DS, ES,\n\t   FS, or GS segment limit.\n\nCLEAR_CPU_BUFFERS macro executes VERW instruction before returning to user\nspace. Use %cs selector to reference VERW operand. This ensures VERW will\nnot #GP for an arbitrary user %ds.\n\n[ mingo: Fixed the SOB chain. ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:32:27.887Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bfd1d223d80cb29a210caa1bd5e21f0816d58f02"
        },
        {
          "url": "https://git.kernel.org/stable/c/ada431c6c31a2c8c37991c46089af5caa23a9c6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/38c5fe74f3bef98f75d16effa49836d50c9b6097"
        },
        {
          "url": "https://git.kernel.org/stable/c/481b477ab63c7245715a3e57ba79eb87c2dc0d02"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc576fbaf82deded606e69a00efe9752136bf91d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e4d2102018542e3ae5e297bc6e229303abff8a0f"
        }
      ],
      "title": "x86/bugs: Use code segment selector for VERW operand",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50072",
    "datePublished": "2024-10-29T00:50:14.170Z",
    "dateReserved": "2024-10-21T19:36:19.940Z",
    "dateUpdated": "2024-12-19T09:32:27.887Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-50072\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-29T01:15:04.393\",\"lastModified\":\"2024-11-08T16:15:45.547\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/bugs: Use code segment selector for VERW operand\\n\\nRobert Gill reported below #GP in 32-bit mode when dosemu software was\\nexecuting vm86() system call:\\n\\n  general protection fault: 0000 [#1] PREEMPT SMP\\n  CPU: 4 PID: 4610 Comm: dosemu.bin Not tainted 6.6.21-gentoo-x86 #1\\n  Hardware name: Dell Inc. PowerEdge 1950/0H723K, BIOS 2.7.0 10/30/2010\\n  EIP: restore_all_switch_stack+0xbe/0xcf\\n  EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000\\n  ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: ff8affdc\\n  DS: 0000 ES: 0000 FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046\\n  CR0: 80050033 CR2: 00c2101c CR3: 04b6d000 CR4: 000406d0\\n  Call Trace:\\n   show_regs+0x70/0x78\\n   die_addr+0x29/0x70\\n   exc_general_protection+0x13c/0x348\\n   exc_bounds+0x98/0x98\\n   handle_exception+0x14d/0x14d\\n   exc_bounds+0x98/0x98\\n   restore_all_switch_stack+0xbe/0xcf\\n   exc_bounds+0x98/0x98\\n   restore_all_switch_stack+0xbe/0xcf\\n\\nThis only happens in 32-bit mode when VERW based mitigations like MDS/RFDS\\nare enabled. This is because segment registers with an arbitrary user value\\ncan result in #GP when executing VERW. Intel SDM vol. 2C documents the\\nfollowing behavior for VERW instruction:\\n\\n  #GP(0) - If a memory operand effective address is outside the CS, DS, ES,\\n\\t   FS, or GS segment limit.\\n\\nCLEAR_CPU_BUFFERS macro executes VERW instruction before returning to user\\nspace. Use %cs selector to reference VERW operand. This ensures VERW will\\nnot #GP for an arbitrary user %ds.\\n\\n[ mingo: Fixed the SOB chain. ]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/bugs: Usar selector de segmento de c\u00f3digo para el operando VERW Robert Gill inform\u00f3 lo siguiente: #GP en modo de 32 bits cuando el software dosemu estaba ejecutando la llamada al sistema vm86(): error de protecci\u00f3n general: 0000 [#1] PREEMPT SMP CPU: 4 PID: 4610 Comm: dosemu.bin No contaminado 6.6.21-gentoo-x86 #1 Nombre del hardware: Dell Inc. PowerEdge 1950/0H723K, BIOS 2.7.0 30/10/2010 EIP: restore_all_switch_stack+0xbe/0xcf EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: ff8affdc DS: 0000 ES: 0000 FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010046 CR0: 80050033 CR2: 00c2101c CR3: 04b6d000 CR4: 000406d0 Seguimiento de llamadas: show_regs+0x70/0x78 die_addr+0x29/0x70 exc_general_protection+0x13c/0x348 exc_bounds+0x98/0x98 handle_exception+0x14d/0x14d exc_bounds+0x98/0x98 restore_all_switch_stack+0xbe/0xcf exc_bounds+0x98/0x98 restore_all_switch_stack+0xbe/0xcf Esto solo sucede en el modo de 32 bits cuando se habilitan las mitigaciones basadas en VERW como MDS/RFDS. Esto se debe a que los registros de segmento con un valor de usuario arbitrario pueden generar #GP al ejecutar VERW. Intel SDM vol. 2C documenta el siguiente comportamiento para la instrucci\u00f3n VERW: #GP(0) - Si la direcci\u00f3n efectiva de un operando de memoria est\u00e1 fuera del l\u00edmite de segmento CS, DS, ES, FS o GS. La macro CLEAR_CPU_BUFFERS ejecuta la instrucci\u00f3n VERW antes de regresar al espacio de usuario. Use el selector %cs para hacer referencia al operando VERW. Esto garantiza que VERW no genere #GP para un usuario arbitrario %ds. [ mingo: Se corrigi\u00f3 la cadena SOB. ]\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.215\",\"versionEndExcluding\":\"5.11\",\"matchCriteriaId\":\"5E2C9DA6-EADC-4426-9A6E-CF06497716BE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.154\",\"versionEndExcluding\":\"5.16\",\"matchCriteriaId\":\"21EE109E-592F-4A01-B5D2-F078967481BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.81\",\"versionEndExcluding\":\"6.2\",\"matchCriteriaId\":\"67A7652D-50D6-4825-AB66-ECE5A0A5DC3A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.21\",\"versionEndExcluding\":\"6.6.58\",\"matchCriteriaId\":\"A9536C02-22D6-445E-A8AF-FF25762F8DF4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.11.5\",\"matchCriteriaId\":\"6E62D61A-F704-44DB-A311-17B7534DA7BC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7.9\",\"versionEndExcluding\":\"6.8\",\"matchCriteriaId\":\"739125EE-99C1-42E1-B870-04FD5010BA66\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/38c5fe74f3bef98f75d16effa49836d50c9b6097\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/481b477ab63c7245715a3e57ba79eb87c2dc0d02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ada431c6c31a2c8c37991c46089af5caa23a9c6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc576fbaf82deded606e69a00efe9752136bf91d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bfd1d223d80cb29a210caa1bd5e21f0816d58f02\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e4d2102018542e3ae5e297bc6e229303abff8a0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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