CVE-2023-52704 (GCVE-0-2023-52704)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:22 – Updated: 2026-08-05 09:11
VLAI
Title
freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL
Summary
In the Linux kernel, the following vulnerability has been resolved: freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL Tetsuo-San noted that commit f5d39b020809 ("freezer,sched: Rewrite core freezer logic") broke call_usermodehelper_exec() for the KILLABLE case. Specifically it was missed that the second, unconditional, wait_for_completion() was not optional and ensures the on-stack completion is unused before going out-of-scope.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-29 17:51 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f5d39b020809146cc28e6e73369bf8065e0310aa , < 7f9f6c54da876b3f0bece2b569456ceb96965ed7 (git)
Affected: f5d39b020809146cc28e6e73369bf8065e0310aa , < eedeb787ebb53de5c5dcf7b7b39d01bf1b0f037d (git)
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Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.13 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "kernel/umh.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "7f9f6c54da876b3f0bece2b569456ceb96965ed7",
                  "status": "affected",
                  "version": "f5d39b020809146cc28e6e73369bf8065e0310aa",
                  "versionType": "git"
                },
                {
                  "lessThan": "eedeb787ebb53de5c5dcf7b7b39d01bf1b0f037d",
                  "status": "affected",
                  "version": "f5d39b020809146cc28e6e73369bf8065e0310aa",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "kernel/umh.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.1"
                },
                {
                  "lessThan": "6.1",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.13",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.13",
                      "versionStartIncluding": "6.1",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2",
                      "versionStartIncluding": "6.1",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfreezer,umh: Fix call_usermode_helper_exec() vs SIGKILL\n\nTetsuo-San noted that commit f5d39b020809 (\"freezer,sched: Rewrite\ncore freezer logic\") broke call_usermodehelper_exec() for the KILLABLE\ncase.\n\nSpecifically it was missed that the second, unconditional,\nwait_for_completion() was not optional and ensures the on-stack\ncompletion is unused before going out-of-scope."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The bug is reachable only through call_usermodehelper_exec() with UMH_KILLABLE, used solely by request_module()/call_modprobe; an unprivileged local attacker triggers this via syscalls such as socket() that autoload net-pf-* modules, then sends SIGKILL to the waiting process.\nAC:L - The attacker controls both sides of the race by triggering request_module and delivering SIGKILL to their own process while it waits for modprobe, and can retry until umh_complete() completes the on-stack completion after the waiter has returned.\nPR:L - Module autoload via request_module() does not require CAP_SYS_MODULE; an ordinary unprivileged user can invoke it through socket() and many other unprivileged entry points with no elevated capabilities.\nUI:N - Exploitation requires no action from another user; the attacker alone triggers module autoload and signals their own process.\nS:U - Impact is confined to the local kernel\u0027s security authority (kernel memory corruption / privilege escalation); it does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug is a use-after-free of an on-stack completion: umh_complete()/complete() operates on freed stack memory, which is memory corruption that can be leveraged for information disclosure under the UAF impact model.\nI:H - complete() writes to the freed stack completion (lock and done fields), corrupting the live or reused kernel stack and enabling control-flow hijacking / arbitrary integrity impact.\nA:H - The stack UAF causes kernel warnings/oopses (as seen in the syzbot lockdep crash in umh_complete) and can panic or hang the system."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:11:05.098Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/7f9f6c54da876b3f0bece2b569456ceb96965ed7"
            },
            {
              "url": "https://git.kernel.org/stable/c/eedeb787ebb53de5c5dcf7b7b39d01bf1b0f037d"
            }
          ],
          "title": "freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52704",
        "datePublished": "2024-05-21T15:22:53.343Z",
        "dateReserved": "2024-03-07T14:49:46.891Z",
        "dateUpdated": "2026-08-05T09:11:05.098Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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