{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-52854","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-21T15:19:24.256Z","datePublished":"2024-05-21T15:31:49.235Z","dateUpdated":"2025-05-04T12:49:42.224Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T12:49:42.224Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\npadata: Fix refcnt handling in padata_free_shell()\n\nIn a high-load arm64 environment, the pcrypt_aead01 test in LTP can lead\nto system UAF (Use-After-Free) issues. Due to the lengthy analysis of\nthe pcrypt_aead01 function call, I'll describe the problem scenario\nusing a simplified model:\n\nSuppose there's 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->done);\n}\n\nvoid user_function() {\n    DECLARE_COMPLETION(done)\n    padata->parallel = parallel;\n    padata->serial = serial;\n    padata_do_parallel();\n    wait_for_completion(&done);\n    padata_free_shell();\n}\n```\n\nIn the corresponding padata.c file, there's 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(&local_list)) {\n        ...\n        padata->serial(padata);\n        cnt++;\n    }\n\n    local_bh_enable();\n\n    if (refcount_sub_and_test(cnt, &pd->refcnt))\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->refcnt`,\n`pd` has already been released by `padata_free_shell()`, resulting\nin a UAF issue with `pd->refcnt`.\n\nThe fix is straightforward: add `refcount_dec_and_test` before calling\n`padata_free_pd` in `padata_free_shell`."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/padata.c"],"versions":[{"version":"07928d9bfc81640bab36f5190e8725894d93b659","lessThan":"41aad9d6953984d134fc50f631f24ef476875d4d","status":"affected","versionType":"git"},{"version":"07928d9bfc81640bab36f5190e8725894d93b659","lessThan":"0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5","status":"affected","versionType":"git"},{"version":"07928d9bfc81640bab36f5190e8725894d93b659","lessThan":"c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275","status":"affected","versionType":"git"},{"version":"07928d9bfc81640bab36f5190e8725894d93b659","lessThan":"1e901bcb8af19416b65f5063a4af7996e5a51d7f","status":"affected","versionType":"git"},{"version":"07928d9bfc81640bab36f5190e8725894d93b659","lessThan":"1734a79e951914f1db2c65e635012a35db1c674b","status":"affected","versionType":"git"},{"version":"07928d9bfc81640bab36f5190e8725894d93b659","lessThan":"7ddc21e317b360c3444de3023bcc83b85fabae2f","status":"affected","versionType":"git"},{"version":"13721e447acc2b82c19cf72e9e6c4291c77693ed","status":"affected","versionType":"git"},{"version":"7a2ccb65f90168edc2348495bb56093c466ffa39","status":"affected","versionType":"git"},{"version":"928cf3d733c4efc221e1a78b14cb2ee066627260","status":"affected","versionType":"git"},{"version":"c9da8ee1491719001a444f4af688b75e72b58418","status":"affected","versionType":"git"},{"version":"dc34710a7aba5207e7cb99d11588c04535b3c53d","status":"affected","versionType":"git"},{"version":"5fefc9b3e3584a1ce98da27c38e1b8dda1939d74","status":"affected","versionType":"git"},{"version":"26daf8e6515c2dcd25d235468420b9f46e0acdac","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/padata.c"],"versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.10.201","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.139","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.63","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.5.12","lessThanOrEqual":"6.5.*","status":"unaffected","versionType":"semver"},{"version":"6.6.2","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.201"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.139"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.63"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.5.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.172"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/41aad9d6953984d134fc50f631f24ef476875d4d"},{"url":"https://git.kernel.org/stable/c/0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5"},{"url":"https://git.kernel.org/stable/c/c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275"},{"url":"https://git.kernel.org/stable/c/1e901bcb8af19416b65f5063a4af7996e5a51d7f"},{"url":"https://git.kernel.org/stable/c/1734a79e951914f1db2c65e635012a35db1c674b"},{"url":"https://git.kernel.org/stable/c/7ddc21e317b360c3444de3023bcc83b85fabae2f"}],"title":"padata: Fix refcnt handling in padata_free_shell()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-52854","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-05-22T18:22:41.019729Z"}}}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-04T17:23:36.501Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T23:11:36.064Z"},"title":"CVE Program 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