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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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      "product_status:fixed": "5",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "memcg_write_event_control(): fix a user-triggerable oops",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:18:11+00:00",
      "cve": "CVE-2024-45021",
      "id": "CVE-2024-45021",
      "initial_release_date": "2024-09-11T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: memcg_write_event_control(): fix a user-triggerable oops",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-45021.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:33:02Z",
      "cve": "CVE-2024-45021",
      "id": "CVE-2024-45021",
      "initial_release_date": "2024-09-12T02:51:21Z",
      "product_status:known_affected": "485",
      "product_status:known_not_affected": "29",
      "product_status:recommended": "957",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-45021",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-45021.json",
      "version": "68"
    },
    "vulnrichment": {
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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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0dea116876eefc9c7ca9c5d74fe665481e499fa3\", \"lessThan\": \"fa5bfdf6cb5846a00e712d630a43e3cf55ccb411\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0dea116876eefc9c7ca9c5d74fe665481e499fa3\", \"lessThan\": \"1b37ec85ad95b612307627758c6018cd9d92cca8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": 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\"version\": \"6.6.48\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"mm/memcontrol-v1.c\"], \"defaultStatus\": \"affected\"}], \"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\": 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\"vulnerable\": true, \"versionEndExcluding\": \"5.10.225\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.166\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.107\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.48\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.7\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"2.6.34\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": 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      "cveMetadata": "{\"cveId\": \"CVE-2024-45021\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:37:45.912Z\", \"dateReserved\": \"2024-08-21T05:34:56.684Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-11T15:13:55.211Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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

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.


Detection rules are retrieved from Rulezet.