CVE-2024-56764 (GCVE-0-2024-56764)
Vulnerability from cvelistv5 – Published: 2025-01-06 16:20 – Updated: 2026-08-05 11:46
VLAI
EPSS
VEX
Title
ublk: detach gendisk from ublk device if add_disk() fails
Summary
In the Linux kernel, the following vulnerability has been resolved:
ublk: detach gendisk from ublk device if add_disk() fails
Inside ublk_abort_requests(), gendisk is grabbed for aborting all
inflight requests. And ublk_abort_requests() is called when exiting
the uring context or handling timeout.
If add_disk() fails, the gendisk may have been freed when calling
ublk_abort_requests(), so use-after-free can be caused when getting
disk's reference in ublk_abort_requests().
Fixes the bug by detaching gendisk from ublk device if add_disk() fails.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-11 15:41 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
bd23f6c2c2d00518e2f27f2d25cef795de9bee56 , < 7d680f2f76a3417fdfc3946da7471e81464f7b41
(git)
Affected: bd23f6c2c2d00518e2f27f2d25cef795de9bee56 , < 75cd4005da5492129917a4a4ee45e81660556104 (git) |
guessed | |
| Linux | Linux |
Affected:
6.7
Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.8 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix) |
guessed |
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/block/ublk_drv.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7d680f2f76a3417fdfc3946da7471e81464f7b41",
"status": "affected",
"version": "bd23f6c2c2d00518e2f27f2d25cef795de9bee56",
"versionType": "git"
},
{
"lessThan": "75cd4005da5492129917a4a4ee45e81660556104",
"status": "affected",
"version": "bd23f6c2c2d00518e2f27f2d25cef795de9bee56",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/block/ublk_drv.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"lessThan": "6.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.8",
"versionStartIncluding": "6.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.13",
"versionStartIncluding": "6.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nublk: detach gendisk from ublk device if add_disk() fails\n\nInside ublk_abort_requests(), gendisk is grabbed for aborting all\ninflight requests. And ublk_abort_requests() is called when exiting\nthe uring context or handling timeout.\n\nIf add_disk() fails, the gendisk may have been freed when calling\nublk_abort_requests(), so use-after-free can be caused when getting\ndisk\u0027s reference in ublk_abort_requests().\n\nFixes the bug by detaching gendisk from ublk device if add_disk() fails."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is reached through an io_uring passthrough control command on the local /dev/ublk-control device; no network vector exists.\nAC:L - After add_disk() fails, ub-\u003eub_disk is a persistent dangling pointer (not a narrow race window), and the attacker deterministically triggers the abort path by exiting the io_uring daemon they control.\nPR:L - ublk explicitly supports UBLK_F_UNPRIVILEGED_DEV, allowing a non-CAP_SYS_ADMIN user to create and start a user-owned ublk device, so an unprivileged local user can reach ublk_ctrl_start_dev().\nUI:N - The attacker performs all steps (create device, run daemon, start dev, exit daemon) with no victim interaction required.\nS:U - The use-after-free is confined to the kernel\u0027s own memory and privilege domain with no crossing of a security boundary.\nC:H - The UAF on the freed gendisk can be reallocated and sprayed by the attacker, enabling disclosure of controlled/adjacent kernel memory contents.\nI:H - The UAF writes into freed memory (get_device refcount) and dereferences disk-\u003equeue, giving heap-spray-based write/control-flow primitives.\nA:H - Dereferencing and modifying the freed gendisk reliably causes kernel memory corruption and oops/panic."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:46:24.574Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7d680f2f76a3417fdfc3946da7471e81464f7b41"
},
{
"url": "https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104"
}
],
"title": "ublk: detach gendisk from ublk device if add_disk() fails",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-56764",
"datePublished": "2025-01-06T16:20:43.256Z",
"dateReserved": "2024-12-29T11:26:39.762Z",
"dateUpdated": "2026-08-05T11:46:24.574Z",
"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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