CVE-2024-56704 (GCVE-0-2024-56704)
Vulnerability from cvelistv5 – Published: 2024-12-28 09:46 – Updated: 2026-08-05 11:46
VLAI
EPSS
VEX
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)
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:58 UTC
CWE
- CWE-415 - Double Free
Assigner
References
11 references
Impacted products
2 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 | |
| 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 |
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.64",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.11.11",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.2",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.13",
"versionStartIncluding": "4.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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]"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The Xen 9pfs frontend is reached through hypervisor-mediated grant-shared rings, event channels and xenstore state transitions, not through the network stack, so the attack path is a local read/write/signal channel into the guest kernel rather than a network protocol. 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:46:10.332Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
],
"title": "9p/xen: fix release of IRQ",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-56704",
"datePublished": "2024-12-28T09:46:25.766Z",
"dateReserved": "2024-12-27T15:00:39.856Z",
"dateUpdated": "2026-08-05T11:46:10.332Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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