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CVE-2024-56704 (GCVE-0-2024-56704)

Vulnerability from cvelistv5 – Published: 2024-12-28 09:46 – Updated: 2026-08-05 11:46
VLAI
Title
9p/xen: fix release of IRQ
Summary
In the Linux kernel, the following vulnerability has been resolved: 9p/xen: fix release of IRQ Kernel logs indicate an IRQ was double-freed. Pass correct device ID during IRQ release. [Dominique: remove confusing variable reset to 0]
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:58 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < 692eb06703afc3e24d889d77e94a0e20229f6a4a (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < d74b4b297097bd361b8a9abfde9b521ff464ea9c (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < 7f5a2ed5c1810661e6b03f5a4ebf17682cdea850 (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < 4950408793b118cb8075bcee1f033b543fb719fa (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < b9e26059664bd9ebc64a0e8f5216266fc9f84265 (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < 2bb3ee1bf237557daea1d58007d2e1d4a6502ccf (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < d888f5f5d76b2722c267e6bdf51d445d60647b7b (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < 530bc9f03a102fac95b07cda513bfc16ff69e0ee (git)
Affected: 71ebd71921e451f0f942ddfe85d01e31ddc6eb88 , < e43c608f40c065b30964f0a806348062991b802d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.19.325 , ≤ 4.19.* (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.11.11 , ≤ 6.11.* (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "cve": "CVE-2024-56704",
      "id": "msrc_CVE-2024-56704",
      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:fixed": "4",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "9p/xen: fix release of IRQ",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-56704.json",
      "version": "3"
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    "redhat_vex": {
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      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: 9p/xen: fix release of IRQ",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56704.json",
      "version": "3"
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      "product_status:known_not_affected": "74",
      "product_status:recommended": "704",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-56704",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-56704.json",
      "version": "81"
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Guest-side triggering (driver unbind, device teardown) is likewise local.\\nAC:L - The wrong-dev_id `free_irq()` fails deterministically on every single ring teardown, so the WARN, the leaked irqaction and the missing `synchronize_irq()` barrier are guaranteed, and the attacker controls both sides of the resulting race by choosing when to drive the device to Closing/removal while continuously notifying the event channel. No condition lies outside the attacker\u0027s influence.\\nPR:N - The realistic attacker is a compromised or malicious 9pfs backend/driver domain, which in Xen\u0027s disaggregated threat model holds zero privileges within the victim guest kernel yet fully controls the xenbus state transitions and event-channel notifications needed to trigger and race the teardown.\\nUI:N - Device teardown is driven entirely by backend-initiated xenbus state changes and requires no action from any user in the guest; having a 9pfs device attached is a configuration precondition, not victim interaction.\\nS:U - The corrupted memory and the resulting control-flow impact are all inside the victim guest\u0027s own Linux kernel, so the vulnerable and impacted components share one security authority; no VM-escape, IOMMU or sandbox boundary is crossed by the flaw itself.\\nC:H - Because `synchronize_irq()` is skipped, `xen_9pfs_front_event_handler()` and the subsequently queued `p9_xen_response()` read `ring-\u003epriv-\u003eclient`, `ring-\u003eintf`, `ring-\u003edata.in` and the `p9_client`/`p9_req_t` structures after `kfree(priv-\u003erings)`/`kfree(priv)`, giving a use-after-free read over reclaimable kernel heap contents, which per guidance is High.\\nI:H - `schedule_work(\u0026ring-\u003ework)` writes workqueue list pointers into the freed `xen_9pfs_dataring` allocation and later executes `p9_xen_response()` against attacker-reclaimable memory including the `p9_client` and its callback state, yielding a use-after-free write and control-flow hijack primitive suitable for privilege escalation inside the guest.\\nA:H - Every teardown hits `WARN(1, \\\"Trying to free already-free IRQ\\\")`, which is an immediate panic under `panic_on_warn`, and the descriptor is freed with a live irqaction attached while the ring memory is released underneath a possibly-running handler, producing oopses and slab corruption; each cycle additionally leaks the `struct irqaction` and its module/PM references.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"71ebd71921e451f0f942ddfe85d01e31ddc6eb88\", \"lessThan\": \"692eb06703afc3e24d889d77e94a0e20229f6a4a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"71ebd71921e451f0f942ddfe85d01e31ddc6eb88\", \"lessThan\": \"d74b4b297097bd361b8a9abfde9b521ff464ea9c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"71ebd71921e451f0f942ddfe85d01e31ddc6eb88\", \"lessThan\": \"7f5a2ed5c1810661e6b03f5a4ebf17682cdea850\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"71ebd71921e451f0f942ddfe85d01e31ddc6eb88\", \"lessThan\": \"4950408793b118cb8075bcee1f033b543fb719fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"71ebd71921e451f0f942ddfe85d01e31ddc6eb88\", \"lessThan\": 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[{\"status\": \"affected\", \"version\": \"4.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.325\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.287\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.231\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.174\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.120\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.64\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/9p/trans_xen.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/692eb06703afc3e24d889d77e94a0e20229f6a4a\"}, {\"url\": \"https://git.kernel.org/stable/c/d74b4b297097bd361b8a9abfde9b521ff464ea9c\"}, {\"url\": \"https://git.kernel.org/stable/c/7f5a2ed5c1810661e6b03f5a4ebf17682cdea850\"}, {\"url\": \"https://git.kernel.org/stable/c/4950408793b118cb8075bcee1f033b543fb719fa\"}, {\"url\": \"https://git.kernel.org/stable/c/b9e26059664bd9ebc64a0e8f5216266fc9f84265\"}, {\"url\": \"https://git.kernel.org/stable/c/2bb3ee1bf237557daea1d58007d2e1d4a6502ccf\"}, {\"url\": \"https://git.kernel.org/stable/c/d888f5f5d76b2722c267e6bdf51d445d60647b7b\"}, {\"url\": \"https://git.kernel.org/stable/c/530bc9f03a102fac95b07cda513bfc16ff69e0ee\"}, {\"url\": \"https://git.kernel.org/stable/c/e43c608f40c065b30964f0a806348062991b802d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\n9p/xen: fix release of IRQ\\n\\nKernel logs indicate an IRQ was double-freed.\\n\\nPass correct device ID during IRQ release.\\n\\n[Dominique: remove confusing variable reset to 0]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.325\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.287\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.231\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.174\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.120\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.64\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.11\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.2\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:46:10.332Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-56704\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:46:10.332Z\", \"dateReserved\": \"2024-12-27T15:00:39.856Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-12-28T09:46:25.766Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.