CVE-2024-27058 (GCVE-0-2024-27058)
Vulnerability from cvelistv5 – Published: 2024-05-01 13:00 – Updated: 2026-08-05 11:29
VLAI
EPSS
VEX
Title
tmpfs: fix race on handling dquot rbtree
Summary
In the Linux kernel, the following vulnerability has been resolved:
tmpfs: fix race on handling dquot rbtree
A syzkaller reproducer found a race while attempting to remove dquot
information from the rb tree.
Fetching the rb_tree root node must also be protected by the
dqopt->dqio_sem, otherwise, giving the right timing, shmem_release_dquot()
will trigger a warning because it couldn't find a node in the tree, when
the real reason was the root node changing before the search starts:
Thread 1 Thread 2
- shmem_release_dquot() - shmem_{acquire,release}_dquot()
- fetch ROOT - Fetch ROOT
- acquire dqio_sem
- wait dqio_sem
- do something, triger a tree rebalance
- release dqio_sem
- acquire dqio_sem
- start searching for the node, but
from the wrong location, missing
the node, and triggering a warning.
Severity
7.8 (High)
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-17 15:12 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
eafc474e202978ac735c551d5ee1eb8c02e2be54 , < c7077f43f30d817d10a9f8245e51576ac114b2f0
(git)
Affected: eafc474e202978ac735c551d5ee1eb8c02e2be54 , < 617d55b90e73c7b4aa2733ca6cc3f9b72d1124bb (git) Affected: eafc474e202978ac735c551d5ee1eb8c02e2be54 , < f82f184874d2761ebaa60dccf577921a0dbb3810 (git) Affected: eafc474e202978ac735c551d5ee1eb8c02e2be54 , < 0a69b6b3a026543bc215ccc866d0aea5579e6ce2 (git) |
guessed | |
| Linux | Linux |
Affected:
6.6
Unaffected: 0 , < 6.6 (semver) Unaffected: 6.6.24 , ≤ 6.6.* (semver) Unaffected: 6.7.12 , ≤ 6.7.* (semver) Unaffected: 6.8.3 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntmpfs: fix race on handling dquot rbtree\n\nA syzkaller reproducer found a race while attempting to remove dquot\ninformation from the rb tree.\n\nFetching the rb_tree root node must also be protected by the\ndqopt-\u003edqio_sem, otherwise, giving the right timing, shmem_release_dquot()\nwill trigger a warning because it couldn\u0027t find a node in the tree, when\nthe real reason was the root node changing before the search starts:\n\nThread 1\t\t\t\tThread 2\n- shmem_release_dquot()\t\t\t- shmem_{acquire,release}_dquot()\n\n- fetch ROOT\t\t\t\t- Fetch ROOT\n\n\t\t\t\t\t- acquire dqio_sem\n- wait dqio_sem\n\n\t\t\t\t\t- do something, triger a tree rebalance\n\t\t\t\t\t- release dqio_sem\n\n- acquire dqio_sem\n- start searching for the node, but\n from the wrong location, missing\n the node, and triggering a warning."
},
{
"lang": "es",
"value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: tmpfs: corrige la ejecuci\u00f3n al manejar dquot rbtree Un reproductor syzkaller encontr\u00f3 una ejecuci\u00f3n al intentar eliminar informaci\u00f3n de dquot del \u00e1rbol rb. La recuperaci\u00f3n del nodo ra\u00edz de rb_tree tambi\u00e9n debe estar protegida por dqopt-\u0026gt;dqio_sem; de lo contrario, si se da el momento adecuado, shmem_release_dquot() activar\u00e1 una advertencia porque no pudo encontrar un nodo en el \u00e1rbol, cuando la verdadera raz\u00f3n era el nodo ra\u00edz. cambiando antes de que comience la b\u00fasqueda: Hilo 1 Hilo 2 - shmem_release_dquot() - shmem_{acquire,release}_dquot() - buscar ROOT - Obtener ROOT - adquirir dqio_sem - esperar dqio_sem - hacer algo, activar un reequilibrio de \u00e1rbol - liberar dqio_sem - adquirir dqio_sem - comienza a buscar el nodo, pero desde la ubicaci\u00f3n incorrecta, pierde el nodo y genera una advertencia."
}
],
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"vulnStatus": "Modified",
"weaknesses": [
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"description": [
{
"lang": "en",
"value": "CWE-362"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
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"cve": "CVE-2024-27058",
"id": "CVE-2024-27058",
"initial_release_date": "2024-05-01T00:00:00+00:00",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: tmpfs: fix race on handling dquot rbtree",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-27058.json",
"version": "3"
},
"suse_vex": {
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"current_release_date": "2026-09-02T01:32:41Z",
"cve": "CVE-2024-27058",
"id": "CVE-2024-27058",
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"product_status:known_not_affected": "385",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2024-27058",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-27058.json",
"version": "19"
},
"vulnrichment": {
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"url": "https://git.kernel.org/stable/c/0a69b6b3a026543bc215ccc866d0aea5579e6ce2"
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"title": "CVE Program Container"
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"shortName": "CISA-ADP"
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}
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"value": "AV:L - The vulnerable code is reached through local filesystem operations (create/chgrp/unlink) on a quota-enabled tmpfs and through the quotactl syscall; there is no network-facing path.\nAC:L - The attacker controls both sides of the race \u2014 spawning concurrent threads that force rb-tree insertions/rotations via dquot_initialize()/dquot_transfer() while the quota release worker walks the tree from its stale root \u2014 and the window spans two blocking lock acquisitions (dq_lock, then dqio_sem) that the attacker can widen by contending dqio_sem; a syzkaller reproducer exists.\nPR:L - Only an unprivileged local user with write access to the quota-enabled tmpfs is needed, since shmem_acquire_dquot()/shmem_release_dquot() run on ordinary inode creation and chown/chgrp with no capability check; enabling quota at mount time is an administrator-side deployment precondition, not an attacker privilege.\nUI:N - The attacker triggers the race entirely from their own processes doing normal file operations; no action by any other user is required.\nS:U - The corruption and crash are confined to the kernel\u0027s own memory and the tmpfs quota subsystem, with no crossing into another security authority such as a hypervisor or IOMMU boundary.\nC:H - Because the root is fetched outside dqio_sem, the traversal can continue into a quota_id object that a concurrent shmem_release_dquot() already rb_erase()d and kfree()d, reading entry-\u003eid and following rb_left/rb_right out of freed kmalloc-64 memory that can be groomed with attacker data, and via Q_GETNEXTQUOTA that freed content is returned to userspace as a qid.\nI:H - After following stale/freed tree pointers the found: path stores four attacker-influenced 64-bit limit values into the located \"entry\", then rb_erase()s and kfree()s it, giving writes and a free against a reallocated heap object \u2014 heap corruption exploitable beyond a simple crash.\nA:H - The race reliably triggers WARN_ONCE() in shmem_release_dquot() (a panic under panic_on_warn) and returns -ENOENT with DQ_ACTIVE_B still set, so quota_release_workfn() restarts on the same dquot and can spin, stalling all quota releases and blocking flush_delayed_work()/quotaoff/umount; the unlocked info-\u003edqi_priv deref in shmem_get_next_id() also NULL-derefs before its sb_has_quota_active() check."
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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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