Vulnerability-Lookup

GHSA-R4V9-V8C5-298P

Vulnerability from github – Published: 2024-10-09 15:32 – Updated: 2025-11-04 00:31

Details

In the Linux kernel, the following vulnerability has been resolved:

lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

If we need to increase the tree depth, allocate a new node, and then race with another thread that increased the tree depth before us, we'll still have a preallocated node that might be used later.

If we then use that node for a new non-root node, it'll still have a pointer to the old root instead of being zeroed - fix this by zeroing it in the cmpxchg failure path.

Severity

4.7 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-47668"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-09T15:15:15Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()\n\nIf we need to increase the tree depth, allocate a new node, and then\nrace with another thread that increased the tree depth before us, we\u0027ll\nstill have a preallocated node that might be used later.\n\nIf we then use that node for a new non-root node, it\u0027ll still have a\npointer to the old root instead of being zeroed - fix this by zeroing it\nin the cmpxchg failure path.",
  "id": "GHSA-r4v9-v8c5-298p",
  "modified": "2025-11-04T00:31:33Z",
  "published": "2024-10-09T15:32:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47668"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f078f8ca93b28a34e20bd050f12cd4efeee7c0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f27f4f445390cb7f73d4209cb2bf32834dc53da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99418ec776a39609f50934720419e0b464ca2283"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2f11c6f3e1fc60742673b8675c95b78447f3dae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d942e855324a60107025c116245095632476613e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ebeff038744c498a036e7a92eb8e433ae0a386d7"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
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  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-47668 (GCVE-0-2024-47668)

Vulnerability from cvelistv5 – Published: 2024-10-09 14:14 – Updated: 2026-08-05 11:39

Title

lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

Summary

In the Linux kernel, the following vulnerability has been resolved: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc() If we need to increase the tree depth, allocate a new node, and then race with another thread that increased the tree depth before us, we'll still have a preallocated node that might be used later. If we then use that node for a new non-root node, it'll still have a pointer to the old root instead of being zeroed - fix this by zeroing it in the cmpxchg failure path.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-10 13:21 UTC

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/0f27f4f445390cb7f…
https://git.kernel.org/stable/c/99418ec776a39609f…
https://git.kernel.org/stable/c/ad5ee9feebc2eb8cf…
https://git.kernel.org/stable/c/ebeff038744c498a0…
https://git.kernel.org/stable/c/d942e855324a60107…
https://git.kernel.org/stable/c/0f078f8ca93b28a34…
https://git.kernel.org/stable/c/b2f11c6f3e1fc6074…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ba20ba2e3743bac786dff777954c11930256075e , < 0f27f4f445390cb7f73d4209cb2bf32834dc53da (git) Affected: ba20ba2e3743bac786dff777954c11930256075e , < 99418ec776a39609f50934720419e0b464ca2283 (git) Affected: ba20ba2e3743bac786dff777954c11930256075e , < ad5ee9feebc2eb8cfc76ed74a2d6e55343b0e169 (git) Affected: ba20ba2e3743bac786dff777954c11930256075e , < ebeff038744c498a036e7a92eb8e433ae0a386d7 (git) Affected: ba20ba2e3743bac786dff777954c11930256075e , < d942e855324a60107025c116245095632476613e (git) Affected: ba20ba2e3743bac786dff777954c11930256075e , < 0f078f8ca93b28a34e20bd050f12cd4efeee7c0f (git) Affected: ba20ba2e3743bac786dff777954c11930256075e , < b2f11c6f3e1fc60742673b8675c95b78447f3dae (git)
Linux	Linux	Affected: 5.1 Unaffected: 0 , < 5.1 (semver) Unaffected: 5.4.284 , ≤ 5.4.* (semver) Unaffected: 5.10.226 , ≤ 5.10.* (semver) Unaffected: 5.15.167 , ≤ 5.15.* (semver) Unaffected: 6.1.110 , ≤ 6.1.* (semver) Unaffected: 6.6.51 , ≤ 6.6.* (semver) Unaffected: 6.10.10 , ≤ 6.10.* (semver) Unaffected: 6.11 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-47668",
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-10T13:21:11.227741Z",
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          "versions": [
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              "versionType": "git"
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              "value": "AV:L - The only genradix users with lock-free concurrent `__genradix_ptr_alloc()` on a shared tree are bcachefs (`bch2_quota_acct()` on the write/inode-create path, `__ec_stripe_mem_alloc()` in erasure coding), reached via ordinary local filesystem syscalls; SCTP\u0027s per-association trees are serialized under the socket lock and `fs/proc/base.c` uses a stack-local tree, so no remote path exists.\nAC:L - The attacker drives both sides of the race with their own threads \u2014 concurrent writes/creates from multiple tasks each call `genradix_ptr_alloc()` outside `q-\u003elock`, and the depth-increase point is deterministic (first access beyond current tree capacity), so it can be targeted and retried at will.\nPR:L - No capability is required: any unprivileged local user with write access on a mounted bcachefs volume triggers `bch2_quota_acct()`/stripe allocation through plain `write()`, `creat()`, and `chown()`, and reads the resulting corrupted counter back via `quotactl(Q_GETQUOTA)` for their own id.\nUI:N - The attacker\u0027s own concurrent threads perform every step; no victim action is needed once the filesystem is mounted as part of normal system operation.\nS:U - The corruption is confined to kernel heap objects managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A dirty node used as a leaf leaves a live kernel heap pointer where zeros are guaranteed, and for bcachefs quotas that value is returned to unprivileged userspace as `d_space` via `quotactl(Q_GETQUOTA)`; the interior-node aliasing additionally exposes unrelated tree contents and gives a read primitive over corrupted pointers.\nI:H - When the dirty node is installed at an interior level, two distinct indices alias onto the same node, so attacker-controlled u64 counter data overwrites live `children[]` pointers of a node still in the tree \u2014 a controlled write over kernel pointers that are later dereferenced and freed.\nA:H - The aliased node is reachable twice from `genradix_free_recurse()`, producing a double `kfree()` of a 512-byte slab object plus `kfree()` of fabricated pointer values, and corrupted quota counters directly trip `BUG_ON()` in `__bch2_quota_transfer()`/`__bch2_quota_reservation_put()` \u2014 all kernel panics."
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    "state": "PUBLISHED"
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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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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GHSA-R4V9-V8C5-298P

CVE-2024-47668 (GCVE-0-2024-47668)

Tags

Sightings

Nomenclature

Related by attack behaviour