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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"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."
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.