CVE-2025-38584 (GCVE-0-2025-38584)
Vulnerability from cvelistv5
Published
2025-08-19 17:03
Modified
2026-10-15 22:02
Severity ?
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: padata: Fix pd UAF once and for all There is a race condition/UAF in padata_reorder that goes back to the initial commit. A reference count is taken at the start of the process in padata_do_parallel, and released at the end in padata_serial_worker. This reference count is (and only is) required for padata_replace to function correctly. If padata_replace is never called then there is no issue. In the function padata_reorder which serves as the core of padata, as soon as padata is added to queue->serial.list, and the associated spin lock released, that padata may be processed and the reference count on pd would go away. Fix this by getting the next padata before the squeue->serial lock is released. In order to make this possible, simplify padata_reorder by only calling it once the next padata arrives.
References
Impacted products
Vendor Product Version
Linux Linux Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
Version: 16295bec6398a3eedc9377e1af6ff4c71b98c300
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no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - The freed `struct parallel_data` and its freed percpu `reorder_list`/`squeue` are read after free (`pd-\u003ecpu`, `pd-\u003eprocessed`, `reorder-\u003elock`, list pointers), and reclaiming those allocations with attacker-sprayed objects turns the UAF into an arbitrary kernel-memory read primitive.\\nI:H - After the free, `padata_reorder()` writes into the freed object (`spin_unlock_bh(\u0026pd-\u003elock)`, `refcount_inc()`, `list_del_init()`) and queues `\u0026pd-\u003ereorder_work` and `\u0026squeue-\u003ework` \\u2014 work_structs inside freed memory whose `func` pointer is later invoked, giving control-flow hijack and privilege escalation once the slab is reclaimed.\\nA:H - Even unexploited, the use-after-free corrupts freed slab and percpu memory, takes a spinlock in freed storage, and queues a work item with a stale function pointer, reliably producing a kernel oops/panic.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"a2048e475e22b13dc3e53d485b7e6e11464ed9a6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"73f132e60857038416540c3599b1de6033d7575a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"609e59193fc6d9dd323f1c6ae1fdd721f1c79680\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"a11a12a9880ab37342b73c93cfe1a3ada02ff0db\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"f231d5d001ec75f5886c02d496a4c79edc383d45\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"dbe3e911a59bda6de96e7cae387ff882c2c177fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"cdf79bd2e1ecb3cc75631c73d8f4149be6019a52\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"16295bec6398a3eedc9377e1af6ff4c71b98c300\", \"lessThan\": \"71203f68c7749609d7fc8ae6ad054bdedeb24f91\", \"versionType\": \"git\"}], \"programFiles\": [\"include/linux/padata.h\", \"kernel/padata.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.34\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.34\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.140\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.86\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.16.*\"}, {\"status\": \"unaffected\", \"version\": \"6.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/linux/padata.h\", \"kernel/padata.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a2048e475e22b13dc3e53d485b7e6e11464ed9a6\"}, {\"url\": \"https://git.kernel.org/stable/c/73f132e60857038416540c3599b1de6033d7575a\"}, {\"url\": \"https://git.kernel.org/stable/c/609e59193fc6d9dd323f1c6ae1fdd721f1c79680\"}, {\"url\": \"https://git.kernel.org/stable/c/a11a12a9880ab37342b73c93cfe1a3ada02ff0db\"}, {\"url\": \"https://git.kernel.org/stable/c/f231d5d001ec75f5886c02d496a4c79edc383d45\"}, {\"url\": \"https://git.kernel.org/stable/c/dbe3e911a59bda6de96e7cae387ff882c2c177fa\"}, {\"url\": \"https://git.kernel.org/stable/c/cdf79bd2e1ecb3cc75631c73d8f4149be6019a52\"}, {\"url\": \"https://git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\npadata: Fix pd UAF once and for all\\n\\nThere is a race condition/UAF in padata_reorder that goes back\\nto the initial commit.  A reference count is taken at the start\\nof the process in padata_do_parallel, and released at the end in\\npadata_serial_worker.\\n\\nThis reference count is (and only is) required for padata_replace\\nto function correctly.  If padata_replace is never called then\\nthere is no issue.\\n\\nIn the function padata_reorder which serves as the core of padata,\\nas soon as padata is added to queue-\u003eserial.list, and the associated\\nspin lock released, that padata may be processed and the reference\\ncount on pd would go away.\\n\\nFix this by getting the next padata before the squeue-\u003eserial lock\\nis released.\\n\\nIn order to make this possible, simplify padata_reorder by only\\ncalling it once the next padata arrives.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.140\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.86\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15.10\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.1\", \"versionStartIncluding\": \"2.6.34\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"2.6.34\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:03:10.424Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38584\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T22:02:26.071Z\", \"dateReserved\": \"2025-04-16T04:51:24.026Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-08-19T17:03:06.172Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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