{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-52854", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-52854", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2024-05-21T15:31:49.235Z", "updatedAt": "2026-05-23T15:27:22.967Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "padata: Fix refcnt handling in padata_free_shell()", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "07928d9bfc81640bab36f5190e8725894d93b659", "status": "affected", "versionType": "git", "lessThan": "41aad9d6953984d134fc50f631f24ef476875d4d" }, { "version": "07928d9bfc81640bab36f5190e8725894d93b659", "status": "affected", "versionType": "git", "lessThan": "0dd34a7ad395dbcf6ae60e48e9786050e25b9bc5" }, { "version": "07928d9bfc81640bab36f5190e8725894d93b659", "status": "affected", "versionType": "git", "lessThan": "c7c26d0ef5d20f00dbb2ae3befcabbe0efa77275" }, { "version": "07928d9bfc81640bab36f5190e8725894d93b659", "status": "affected", "versionType": "git", "lessThan": "1e901bcb8af19416b65f5063a4af7996e5a51d7f" }, { "version": "07928d9bfc81640bab36f5190e8725894d93b659", "status": "affected", "versionType": "git", "lessThan": "1734a79e951914f1db2c65e635012a35db1c674b" }, { "version": "07928d9bfc81640bab36f5190e8725894d93b659", "status": "affected", "versionType": "git", "lessThan": "7ddc21e317b360c3444de3023bcc83b85fabae2f" }, { "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" }, { "version": "3.16.84", "status": "affected", "versionType": "semver", "lessThan": "3.17" }, { "version": "4.4.215", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.9.215", "status": "affected", "versionType": "semver", "lessThan": "4.10" }, { "version": "4.14.172", "status": "affected", "versionType": "semver", "lessThan": "4.15" }, { "version": "4.19.103", "status": "affected", "versionType": "semver", "lessThan": "4.20" }, { "version": "5.4.19", "status": "affected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.5.3", "status": "affected", "versionType": "semver", "lessThan": "5.6" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.6" }, { "version": "5.10.201", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.139", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.63", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.5.12", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.5.*" }, { "version": "6.6.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.7", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }