CVE-2025-38031 (GCVE-0-2025-38031)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2026-05-23 15:58
VLAI
Title
padata: do not leak refcount in reorder_work
Summary
In the Linux kernel, the following vulnerability has been resolved: padata: do not leak refcount in reorder_work A recent patch that addressed a UAF introduced a reference count leak: the parallel_data refcount is incremented unconditionally, regardless of the return value of queue_work(). If the work item is already queued, the incremented refcount is never decremented. Fix this by checking the return value of queue_work() and decrementing the refcount when necessary. Resolves: Unreferenced object 0xffff9d9f421e3d80 (size 192): comm "cryptomgr_probe", pid 157, jiffies 4294694003 hex dump (first 32 bytes): 80 8b cf 41 9f 9d ff ff b8 97 e0 89 ff ff ff ff ...A............ d0 97 e0 89 ff ff ff ff 19 00 00 00 1f 88 23 00 ..............#. backtrace (crc 838fb36): __kmalloc_cache_noprof+0x284/0x320 padata_alloc_pd+0x20/0x1e0 padata_alloc_shell+0x3b/0xa0 0xffffffffc040a54d cryptomgr_probe+0x43/0xc0 kthread+0xf6/0x1f0 ret_from_fork+0x2f/0x50 ret_from_fork_asm+0x1a/0x30
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0 , < b9ad8e50e8589607e68e6c4cefa7f72bf35a2cb1 (git)
Affected: 4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1 , < 1a426abdf1c86882c9203dd8182f3b8274b89938 (git)
Affected: 7000507bb0d2ceb545c0a690e0c707c897d102c2 , < cceb15864e1612ebfbc10ec4e4dcd19a10c0056c (git)
Affected: 6f45ef616775b0ce7889b0f6077fc8d681ab30bc , < 584a729615fa92f4de45480efb7e569d14be1516 (git)
Affected: 8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac , < 5300e487487d7a2e3e1e6e9d8f03ed9452e4019e (git)
Affected: dd7d37ccf6b11f3d95e797ebe4e9e886d0332600 , < 1c65ae4988714716101555fe2b9830e33136d6fb (git)
Affected: dd7d37ccf6b11f3d95e797ebe4e9e886d0332600 , < d6ebcde6d4ecf34f8495fb30516645db3aea8993 (git)
Affected: a54091c24220a4cd847d5b4f36d678edacddbaf0 (git)
Affected: 5.10.235 , < 5.10.238 (semver)
Affected: 5.15.179 , < 5.15.185 (semver)
Affected: 6.1.129 , < 6.1.141 (semver)
Affected: 6.6.76 , < 6.6.93 (semver)
Affected: 6.12.13 , < 6.12.31 (semver)
Affected: 6.13.2 , < 6.14 (semver)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.185 , ≤ 5.15.* (semver)
Unaffected: 6.1.141 , ≤ 6.1.* (semver)
Unaffected: 6.6.93 , ≤ 6.6.* (semver)
Unaffected: 6.12.31 , ≤ 6.12.* (semver)
Unaffected: 6.14.9 , ≤ 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\npadata: do not leak refcount in reorder_work\n\nA recent patch that addressed a UAF introduced a reference count leak:\nthe parallel_data refcount is incremented unconditionally, regardless\nof the return value of queue_work(). If the work item is already queued,\nthe incremented refcount is never decremented.\n\nFix this by checking the return value of queue_work() and decrementing\nthe refcount when necessary.\n\nResolves:\n\nUnreferenced object 0xffff9d9f421e3d80 (size 192):\n  comm \"cryptomgr_probe\", pid 157, jiffies 4294694003\n  hex dump (first 32 bytes):\n    80 8b cf 41 9f 9d ff ff b8 97 e0 89 ff ff ff ff  ...A............\n    d0 97 e0 89 ff ff ff ff 19 00 00 00 1f 88 23 00  ..............#.\n  backtrace (crc 838fb36):\n    __kmalloc_cache_noprof+0x284/0x320\n    padata_alloc_pd+0x20/0x1e0\n    padata_alloc_shell+0x3b/0xa0\n    0xffffffffc040a54d\n    cryptomgr_probe+0x43/0xc0\n    kthread+0xf6/0x1f0\n    ret_from_fork+0x2f/0x50\n    ret_from_fork_asm+0x1a/0x30"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38031\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:35.230\",\"lastModified\":\"2026-06-17T09:15:54.870\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npadata: do not leak refcount in reorder_work\\n\\nA recent patch that addressed a UAF introduced a reference count leak:\\nthe parallel_data refcount is incremented unconditionally, regardless\\nof the return value of queue_work(). If the work item is already queued,\\nthe incremented refcount is never decremented.\\n\\nFix this by checking the return value of queue_work() and decrementing\\nthe refcount when necessary.\\n\\nResolves:\\n\\nUnreferenced object 0xffff9d9f421e3d80 (size 192):\\n  comm \\\"cryptomgr_probe\\\", pid 157, jiffies 4294694003\\n  hex dump (first 32 bytes):\\n    80 8b cf 41 9f 9d ff ff b8 97 e0 89 ff ff ff ff  ...A............\\n    d0 97 e0 89 ff ff ff ff 19 00 00 00 1f 88 23 00  ..............#.\\n  backtrace (crc 838fb36):\\n    __kmalloc_cache_noprof+0x284/0x320\\n    padata_alloc_pd+0x20/0x1e0\\n    padata_alloc_shell+0x3b/0xa0\\n    0xffffffffc040a54d\\n    cryptomgr_probe+0x43/0xc0\\n    kthread+0xf6/0x1f0\\n    ret_from_fork+0x2f/0x50\\n    ret_from_fork_asm+0x1a/0x30\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: padata: no se filtra el recuento de referencias en reorder_work. Un parche reciente que solucion\u00f3 un UAF introdujo una fuga en el recuento de referencias: el recuento de referencias de parallel_data se incrementa incondicionalmente, independientemente del valor de retorno de queue_work(). Si el elemento de trabajo ya est\u00e1 en cola, el recuento incrementado nunca se decrementa. Para solucionar esto, verifique el valor de retorno de queue_work() y decremente el recuento cuando sea necesario. Resuelve: Objeto no referenciado 0xffff9d9f421e3d80 (tama\u00f1o 192): comm \\\"cryptomgr_probe\\\", pid 157, jiffies 4294694003 volcado hexadecimal (primeros 32 bytes): 80 8b cf 41 9f 9d ff ff b8 97 e0 89 ff ff ff ff ...A............ d0 97 e0 89 ff ff ff ff 19 00 00 00 1f 88 23 00 ..............#. seguimiento inverso (crc 838fb36): __kmalloc_cache_noprof+0x284/0x320 padata_alloc_pd+0x20/0x1e0 padata_alloc_shell+0x3b/0xa0 0xffffffffc040a54d cryptomgr_probe+0x43/0xc0 kthread+0xf6/0x1f0 ret_from_fork+0x2f/0x50 ret_from_fork_asm+0x1a/0x30\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/padata.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f4f1b1169fc3694f9bc3e28c6c68dbbf4cc744c0\",\"lessThan\":\"b9ad8e50e8589607e68e6c4cefa7f72bf35a2cb1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4c6209efea2208597dbd3e52dc87a0d1a8f2dbe1\",\"lessThan\":\"1a426abdf1c86882c9203dd8182f3b8274b89938\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7000507bb0d2ceb545c0a690e0c707c897d102c2\",\"lessThan\":\"cceb15864e1612ebfbc10ec4e4dcd19a10c0056c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f45ef616775b0ce7889b0f6077fc8d681ab30bc\",\"lessThan\":\"584a729615fa92f4de45480efb7e569d14be1516\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8ca38d0ca8c3d30dd18d311f1a7ec5cb56972cac\",\"lessThan\":\"5300e487487d7a2e3e1e6e9d8f03ed9452e4019e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd7d37ccf6b11f3d95e797ebe4e9e886d0332600\",\"lessThan\":\"1c65ae4988714716101555fe2b9830e33136d6fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"dd7d37ccf6b11f3d95e797ebe4e9e886d0332600\",\"lessThan\":\"d6ebcde6d4ecf34f8495fb30516645db3aea8993\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a54091c24220a4cd847d5b4f36d678edacddbaf0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.235\",\"lessThan\":\"5.10.238\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.179\",\"lessThan\":\"5.15.185\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.129\",\"lessThan\":\"6.1.141\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.76\",\"lessThan\":\"6.6.93\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.13\",\"lessThan\":\"6.12.31\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.13.2\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/padata.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.238\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.185\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.141\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.93\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.31\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.9\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10.235\",\"versionEndExcluding\":\"5.10.238\",\"matchCriteriaId\":\"ED872180-4736-41CF-AF8A-EE0647EC2341\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15.179\",\"versionEndExcluding\":\"5.15.185\",\"matchCriteriaId\":\"94482D26-A77D-412B-A082-66839F679C23\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1.129\",\"versionEndExcluding\":\"6.1.141\",\"matchCriteriaId\":\"CED757A3-6224-42EA-8EA1-DB2FA89CBB31\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6.76\",\"versionEndExcluding\":\"6.6.93\",\"matchCriteriaId\":\"C6A7D0F1-5932-4545-B658-373A044EFD16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_ker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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-03T07:20:16+00:00",
      "cve": "CVE-2025-38031",
      "id": "CVE-2025-38031",
      "initial_release_date": "2025-06-18T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: padata: do not leak refcount in reorder_work",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38031.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T17:03:09Z",
      "cve": "CVE-2025-38031",
      "id": "CVE-2025-38031",
      "initial_release_date": "2025-06-19T03:15:44Z",
      "product_status:known_affected": "591",
      "product_status:known_not_affected": "230",
      "product_status:recommended": "396",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38031",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38031.json",
      "version": "38"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.