Vulnerability-Lookup

GHSA-643H-952W-33F5

Vulnerability from github – Published: 2024-10-29 03:31 – Updated: 2025-11-04 00:31

Details

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. ]

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-50072"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-29T01:15:04Z",
    "severity": "MODERATE"
  },
  "details": "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. ]",
  "id": "GHSA-643h-952w-33f5",
  "modified": "2025-11-04T00:31:51Z",
  "published": "2024-10-29T03:31:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50072"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38c5fe74f3bef98f75d16effa49836d50c9b6097"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/481b477ab63c7245715a3e57ba79eb87c2dc0d02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ada431c6c31a2c8c37991c46089af5caa23a9c6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc576fbaf82deded606e69a00efe9752136bf91d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfd1d223d80cb29a210caa1bd5e21f0816d58f02"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e4d2102018542e3ae5e297bc6e229303abff8a0f"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-50072 (GCVE-0-2024-50072)

Vulnerability from cvelistv5 – Published: 2024-10-29 00:50 – Updated: 2026-05-23 15:54

Title

x86/bugs: Use code segment selector for VERW operand

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. ]

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

8 references

URL	Tags
https://git.kernel.org/stable/c/bfd1d223d80cb29a2…
https://git.kernel.org/stable/c/ada431c6c31a2c8c3…
https://git.kernel.org/stable/c/38c5fe74f3bef98f7…
https://git.kernel.org/stable/c/481b477ab63c72457…
https://git.kernel.org/stable/c/bc576fbaf82deded6…
https://git.kernel.org/stable/c/e4d2102018542e3ae…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 50f021f0b985629accf10481a6e89af8b9700583 , < bfd1d223d80cb29a210caa1bd5e21f0816d58f02 (git) Affected: d54de9f2a127090f2017184e8257795b487d5312 , < ada431c6c31a2c8c37991c46089af5caa23a9c6e (git) Affected: 2e3087505ddb8ba2d3d4c81306cca11e868fcdb9 , < 38c5fe74f3bef98f75d16effa49836d50c9b6097 (git) Affected: ca13d8cd8dac25558da4ee8df4dc70e8e7f9d762 , < 481b477ab63c7245715a3e57ba79eb87c2dc0d02 (git) Affected: a0e2dab44d22b913b4c228c8b52b2a104434b0b3 , < bc576fbaf82deded606e69a00efe9752136bf91d (git) Affected: a0e2dab44d22b913b4c228c8b52b2a104434b0b3 , < e4d2102018542e3ae5e297bc6e229303abff8a0f (git) Affected: 51eca9f1fd047b500137d021f882d93f03280118 (git) Affected: 5.10.215 , < 5.10.229 (semver) Affected: 5.15.154 , < 5.15.171 (semver) Affected: 6.1.81 , < 6.1.116 (semver) Affected: 6.6.21 , < 6.6.58 (semver) Affected: 6.7.9 , < 6.8 (semver)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 5.10.229 , ≤ 5.10.* (semver) Unaffected: 5.15.171 , ≤ 5.15.* (semver) Unaffected: 6.1.116 , ≤ 6.1.* (semver) Unaffected: 6.6.58 , ≤ 6.6.* (semver) Unaffected: 6.11.5 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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JSON

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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 MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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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