CVE-2023-52854 (GCVE-0-2023-52854)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:31 – Updated: 2025-05-04 12:49
VLAI?
Title
padata: Fix refcnt handling in padata_free_shell()
Summary
In the Linux kernel, the following vulnerability has been resolved: padata: Fix refcnt handling in padata_free_shell() In a high-load arm64 environment, the pcrypt_aead01 test in LTP can lead to system UAF (Use-After-Free) issues. Due to the lengthy analysis of the pcrypt_aead01 function call, I'll describe the problem scenario using a simplified model: Suppose there's a user of padata named `user_function` that adheres to the padata requirement of calling `padata_free_shell` after `serial()` has been invoked, as demonstrated in the following code: ```c struct request { struct padata_priv padata; struct completion *done; }; void parallel(struct padata_priv *padata) { do_something(); } void serial(struct padata_priv *padata) { struct request *request = container_of(padata, struct request, padata); complete(request->done); } void user_function() { DECLARE_COMPLETION(done) padata->parallel = parallel; padata->serial = serial; padata_do_parallel(); wait_for_completion(&done); padata_free_shell(); } ``` In the corresponding padata.c file, there's the following code: ```c static void padata_serial_worker(struct work_struct *serial_work) { ... cnt = 0; while (!list_empty(&local_list)) { ... padata->serial(padata); cnt++; } local_bh_enable(); if (refcount_sub_and_test(cnt, &pd->refcnt)) padata_free_pd(pd); } ``` Because of the high system load and the accumulation of unexecuted softirq at this moment, `local_bh_enable()` in padata takes longer to execute than usual. Subsequently, when accessing `pd->refcnt`, `pd` has already been released by `padata_free_shell()`, resulting in a UAF issue with `pd->refcnt`. The fix is straightforward: add `refcount_dec_and_test` before calling `padata_free_pd` in `padata_free_shell`.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 41aad9d6953984d134fc50f631f24ef476875d4d (git)
Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5 (git)
Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275 (git)
Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 1e901bcb8af19416b65f5063a4af7996e5a51d7f (git)
Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 1734a79e951914f1db2c65e635012a35db1c674b (git)
Affected: 07928d9bfc81640bab36f5190e8725894d93b659 , < 7ddc21e317b360c3444de3023bcc83b85fabae2f (git)
Affected: 13721e447acc2b82c19cf72e9e6c4291c77693ed (git)
Affected: 7a2ccb65f90168edc2348495bb56093c466ffa39 (git)
Affected: 928cf3d733c4efc221e1a78b14cb2ee066627260 (git)
Affected: c9da8ee1491719001a444f4af688b75e72b58418 (git)
Affected: dc34710a7aba5207e7cb99d11588c04535b3c53d (git)
Affected: 5fefc9b3e3584a1ce98da27c38e1b8dda1939d74 (git)
Affected: 26daf8e6515c2dcd25d235468420b9f46e0acdac (git)
Create a notification for this product.
    Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.201 , ≤ 5.10.* (semver)
Unaffected: 5.15.139 , ≤ 5.15.* (semver)
Unaffected: 6.1.63 , ≤ 6.1.* (semver)
Unaffected: 6.5.12 , ≤ 6.5.* (semver)
Unaffected: 6.6.2 , ≤ 6.6.* (semver)
Unaffected: 6.7 , ≤ * (original_commit_for_fix)
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Due to the lengthy analysis of\\nthe pcrypt_aead01 function call, I\u0027ll describe the problem scenario\\nusing a simplified model:\\n\\nSuppose there\u0027s a user of padata named `user_function` that adheres to\\nthe padata requirement of calling `padata_free_shell` after `serial()`\\nhas been invoked, as demonstrated in the following code:\\n\\n```c\\nstruct request {\\n    struct padata_priv padata;\\n    struct completion *done;\\n};\\n\\nvoid parallel(struct padata_priv *padata) {\\n    do_something();\\n}\\n\\nvoid serial(struct padata_priv *padata) {\\n    struct request *request = container_of(padata,\\n    \\t\\t\\t\\tstruct request,\\n\\t\\t\\t\\tpadata);\\n    complete(request-\u003edone);\\n}\\n\\nvoid user_function() {\\n    DECLARE_COMPLETION(done)\\n    padata-\u003eparallel = parallel;\\n    padata-\u003eserial = serial;\\n    padata_do_parallel();\\n    wait_for_completion(\u0026done);\\n    padata_free_shell();\\n}\\n```\\n\\nIn the corresponding padata.c file, there\u0027s the following code:\\n\\n```c\\nstatic void padata_serial_worker(struct work_struct *serial_work) {\\n    ...\\n    cnt = 0;\\n\\n    while (!list_empty(\u0026local_list)) {\\n        ...\\n        padata-\u003eserial(padata);\\n        cnt++;\\n    }\\n\\n    local_bh_enable();\\n\\n    if (refcount_sub_and_test(cnt, \u0026pd-\u003erefcnt))\\n        padata_free_pd(pd);\\n}\\n```\\n\\nBecause of the high system load and the accumulation of unexecuted\\nsoftirq at this moment, `local_bh_enable()` in padata takes longer\\nto execute than usual. Subsequently, when accessing `pd-\u003erefcnt`,\\n`pd` has already been released by `padata_free_shell()`, resulting\\nin a UAF issue with `pd-\u003erefcnt`.\\n\\nThe fix is straightforward: add `refcount_dec_and_test` before calling\\n`padata_free_pd` in `padata_free_shell`.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-05-29T05:18:30.184Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52854\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-02T23:11:36.064Z\", \"dateReserved\": \"2024-05-21T15:19:24.256Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:31:49.235Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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