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GHSA-MJP6-8Q33-2QX3

Vulnerability from github – Published: 2025-05-09 09:33 – Updated: 2025-11-17 15:30

Details

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

tracing: fprobe events: Fix possible UAF on modules

Commit ac91052f0ae5 ("tracing: tprobe-events: Fix leakage of module refcount") moved try_module_get() from __find_tracepoint_module_cb() to find_tracepoint() caller, but that introduced a possible UAF because the module can be unloaded before try_module_get(). In this case, the module object should be freed too. Thus, try_module_get() does not only fail but may access to the freed object.

To avoid that, try_module_get() in __find_tracepoint_module_cb() again.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37845"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-09T07:16:05Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: fprobe events: Fix possible UAF on modules\n\nCommit ac91052f0ae5 (\"tracing: tprobe-events: Fix leakage of module\nrefcount\") moved try_module_get() from __find_tracepoint_module_cb()\nto find_tracepoint() caller, but that introduced a possible UAF\nbecause the module can be unloaded before try_module_get(). In this\ncase, the module object should be freed too. Thus, try_module_get()\ndoes not only fail but may access to the freed object.\n\nTo avoid that, try_module_get() in __find_tracepoint_module_cb()\nagain.",
  "id": "GHSA-mjp6-8q33-2qx3",
  "modified": "2025-11-17T15:30:30Z",
  "published": "2025-05-09T09:33:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37845"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/626f01f4d26e8cf92e69c1df53036153c8e98a20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/868df4eb784c3ccc7e4340a9ea993cbbedca167e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a27d2de2472b1cc7d582ab405d1d5832a80481de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd941507a9486252d6fcf11814387666792020f3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-37845 (GCVE-0-2025-37845)

Vulnerability from cvelistv5 – Published: 2025-05-09 06:41 – Updated: 2026-08-05 11:57

Title

tracing: fprobe events: Fix possible UAF on modules

Summary

In the Linux kernel, the following vulnerability has been resolved: tracing: fprobe events: Fix possible UAF on modules Commit ac91052f0ae5 ("tracing: tprobe-events: Fix leakage of module refcount") moved try_module_get() from __find_tracepoint_module_cb() to find_tracepoint() caller, but that introduced a possible UAF because the module can be unloaded before try_module_get(). In this case, the module object should be freed too. Thus, try_module_get() does not only fail but may access to the freed object. To avoid that, try_module_get() in __find_tracepoint_module_cb() again.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/868df4eb784c3ccc7…
https://git.kernel.org/stable/c/a27d2de2472b1cc7d…
https://git.kernel.org/stable/c/626f01f4d26e8cf92…
https://git.kernel.org/stable/c/dd941507a9486252d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 71c9cf87776eaa556fc0a0a060df94200e1f521c , < 868df4eb784c3ccc7e4340a9ea993cbbedca167e (git) Affected: 9db2b8cf4ea07b579db588e0353d5680f5d1f071 , < a27d2de2472b1cc7d582ab405d1d5832a80481de (git) Affected: ac91052f0ae5be9e46211ba92cc31c0e3b0a933a , < 626f01f4d26e8cf92e69c1df53036153c8e98a20 (git) Affected: ac91052f0ae5be9e46211ba92cc31c0e3b0a933a , < dd941507a9486252d6fcf11814387666792020f3 (git) Affected: 6.12.21 , < 6.12.24 (semver) Affected: 6.13.9 , < 6.13.12 (semver)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.12.24 , ≤ 6.12.* (semver) Unaffected: 6.13.12 , ≤ 6.13.* (semver) Unaffected: 6.14.3 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: fprobe events: Fix possible UAF on modules\n\nCommit ac91052f0ae5 (\"tracing: tprobe-events: Fix leakage of module\nrefcount\") moved try_module_get() from __find_tracepoint_module_cb()\nto find_tracepoint() caller, but that introduced a possible UAF\nbecause the module can be unloaded before try_module_get(). In this\ncase, the module object should be freed too. Thus, try_module_get()\ndoes not only fail but may access to the freed object.\n\nTo avoid that, try_module_get() in __find_tracepoint_module_cb()\nagain."
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              "value": "AV:L - The vulnerable path is reached only by writing a tracepoint probe definition to the tracefs `dynamic_events` file (`trace_fprobe_create()` \u2192 `find_tracepoint()`), which requires local access to the machine. There is no network-facing consumer of this code.\nAC:L - The attacker drives both sides of the race \u2014 repeatedly issuing `t:` tprobe creations while causing module load/unload churn \u2014 and the operation can be retried indefinitely at no cost until the window between `mutex_unlock()` in `for_each_module_tracepoint()` and `try_module_get()` is hit. `CONFIG_FPROBE_EVENTS` is `default y`, so no rare configuration is required.\nPR:L - Exploitation needs write access to the tracefs `dynamic_events` interface, which is routinely delegated to non-root tracing/debug accounts and groups (Android shell/system, ChromeOS debugd, perf/tracing groups, container debug sidecars) rather than being an exclusively root-only capability. No credential check exists in the code path itself beyond file permissions.\nUI:N - The attacker performs the tracefs write and the concurrent module operations entirely on their own; no victim action or interaction is needed.\nS:U - The use-after-free corrupts kernel memory within the same security authority as the kernel itself; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The stale `struct module` and the stale tracepoint structure are read after being freed, and if the freed region is reclaimed by attacker-sprayed allocations the resulting values (`probestub` address, funcname resolved via `kallsyms_lookup()`) feed back into observable state, giving a path to kernel memory disclosure.\nI:H - `try_module_get()` performs an atomic increment into freed memory, and a \"successful\" get lets the code register a tracepoint probe and an ftrace hook using function pointers read out of freed, reclaimable memory \u2014 a write plus control-flow-hijack primitive.\nA:H - Touching the freed module allocation (vmalloc-backed, so frequently unmapped on free) produces an immediate oops or panic, and the subsequent probe registration on freed tracepoint data reliably destabilizes the kernel."
            }
          ]
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          "url": "https://git.kernel.org/stable/c/dd941507a9486252d6fcf11814387666792020f3"
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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.

Detection rules are retrieved from Rulezet.

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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