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CVE-2024-45021 (GCVE-0-2024-45021)

Vulnerability from cvelistv5 – Published: 2024-09-11 15:13 – Updated: 2026-08-05 11:37
VLAI
Title
memcg_write_event_control(): fix a user-triggerable oops
Summary
In the Linux kernel, the following vulnerability has been resolved: memcg_write_event_control(): fix a user-triggerable oops we are *not* guaranteed that anything past the terminating NUL is mapped (let alone initialized with anything sane).
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 15:47 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < fa5bfdf6cb5846a00e712d630a43e3cf55ccb411 (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < 1b37ec85ad95b612307627758c6018cd9d92cca8 (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < ad149f5585345e383baa65f1539d816cd715fd3b (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < 0fbe2a72e853a1052abe9bc2b7df8ddb102da227 (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < 43768fa80fd192558737e24ed6548f74554611d7 (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < f1aa7c509aa766080db7ab3aec2e31b1df09e57c (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < 21b578f1d599edb87462f11113c5b0fc7a04ac61 (git)
Affected: 0dea116876eefc9c7ca9c5d74fe665481e499fa3 , < 046667c4d3196938e992fba0dfcde570aa85cd0e (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.34
Unaffected: 0 , < 2.6.34 (semver)
Unaffected: 4.19.321 , ≤ 4.19.* (semver)
Unaffected: 5.4.283 , ≤ 5.4.* (semver)
Unaffected: 5.10.225 , ≤ 5.10.* (semver)
Unaffected: 5.15.166 , ≤ 5.15.* (semver)
Unaffected: 6.1.107 , ≤ 6.1.* (semver)
Unaffected: 6.6.48 , ≤ 6.6.* (semver)
Unaffected: 6.10.7 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmemcg_write_event_control(): fix a user-triggerable oops\n\nwe are *not* guaranteed that anything past the terminating NUL\nis mapped (let alone initialized with anything sane)."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerability is triggered by a write(2) to the cgroup v1 file `cgroup.event_control` on a locally mounted cgroupfs hierarchy. There is no network-reachable path to `memcg_write_event_control()`.\nAC:L - The attacker fully controls the write length and content, so the out-of-bounds read past the end of the `kmalloc(len+1)` buffer is 100% deterministic; sizing the write to exactly 4095 bytes places the buffer at a page boundary, and heap/page grooming lets the attacker steer the unbounded `memparse()` walk into an unmapped page. cgroup v1 with the memory controller is a widely deployed default (Android, legacy/hybrid systemd, embedded), not a rare config.\nPR:L - `cgroup.event_control` was flagged `CFTYPE_WORLD_WRITABLE` (mode 0666), so any unprivileged local user can write it wherever a cgroup v1 memory hierarchy is mounted; additionally `cgroup_fs_type` has `FS_USERNS_MOUNT` and `cgroup1_get_tree()` only requires `ns_capable(user_ns, CAP_SYS_ADMIN)`, obtainable via `unshare -Urmc`.\nUI:N - A single write() syscall from the attacker\u0027s own process triggers the bug; no victim action, mount by an administrator, or other user involvement is required.\nS:U - The out-of-bounds read and the resulting oops occur entirely within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The read runs off the end of the slab object and, via `memparse()`/`simple_strtoull()`, continues unbounded until a non-digit byte (and up to 19 bytes via `kstrndup()` on the vmpressure path), so it is not strictly bounded to a few bytes. The parsed adjacent-heap value is installed as a memcg usage threshold that the attacker can read back by driving cgroup memory usage and observing eventfd notifications, giving a genuine kernel-memory disclosure channel.\nI:N - The defect is purely an out-of-bounds read; no memory is written out of bounds and no attacker-controlled write primitive is created. The only state change is a threshold value inside the attacker\u0027s own cgroup, which they could already set directly by supplying an explicit args field.\nA:H - The unbounded read past a page-aligned kmalloc-4k object can reach an unmapped page and produce a kernel oops, exactly as described by the fix (\"user-triggerable oops\"); on KASAN or DEBUG_PAGEALLOC kernels the fault is deterministic and repeatable."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:37:45.912Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/fa5bfdf6cb5846a00e712d630a43e3cf55ccb411"
            },
            {
              "url": "https://git.kernel.org/stable/c/1b37ec85ad95b612307627758c6018cd9d92cca8"
            },
            {
              "url": "https://git.kernel.org/stable/c/ad149f5585345e383baa65f1539d816cd715fd3b"
            },
            {
              "url": "https://git.kernel.org/stable/c/0fbe2a72e853a1052abe9bc2b7df8ddb102da227"
            },
            {
              "url": "https://git.kernel.org/stable/c/43768fa80fd192558737e24ed6548f74554611d7"
            },
            {
              "url": "https://git.kernel.org/stable/c/f1aa7c509aa766080db7ab3aec2e31b1df09e57c"
            },
            {
              "url": "https://git.kernel.org/stable/c/21b578f1d599edb87462f11113c5b0fc7a04ac61"
            },
            {
              "url": "https://git.kernel.org/stable/c/046667c4d3196938e992fba0dfcde570aa85cd0e"
            }
          ],
          "title": "memcg_write_event_control(): fix a user-triggerable oops",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-45021",
        "datePublished": "2024-09-11T15:13:55.211Z",
        "dateReserved": "2024-08-21T05:34:56.684Z",
        "dateUpdated": "2026-08-05T11:37:45.912Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.