CVE-2024-35887 (GCVE-0-2024-35887)
Vulnerability from cvelistv5 – Published: 2024-05-19 08:34 – Updated: 2026-09-14 11:57
VLAI
EPSS
VEX
Title
ax25: fix use-after-free bugs caused by ax25_ds_del_timer
Summary
In the Linux kernel, the following vulnerability has been resolved:
ax25: fix use-after-free bugs caused by ax25_ds_del_timer
When the ax25 device is detaching, the ax25_dev_device_down()
calls ax25_ds_del_timer() to cleanup the slave_timer. When
the timer handler is running, the ax25_ds_del_timer() that
calls del_timer() in it will return directly. As a result,
the use-after-free bugs could happen, one of the scenarios
is shown below:
(Thread 1) | (Thread 2)
| ax25_ds_timeout()
ax25_dev_device_down() |
ax25_ds_del_timer() |
del_timer() |
ax25_dev_put() //FREE |
| ax25_dev-> //USE
In order to mitigate bugs, when the device is detaching, use
timer_shutdown_sync() to stop the timer.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-29 18:31 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 28f2d36ac52225a13e020c2589833f1816a0cfc6
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8a912ef5b7c5d14fb41b9a7935d1df5bb87058bf (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 74204bf9050f7627aead9875fe4e07ba125cb19b (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c6a368f9c7af4c14b14d390c2543af8001c9bdb9 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fd819ad3ecf6f3c232a06b27423ce9ed8c20da89 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.26 , ≤ 6.6.* (semver) Unaffected: 6.8.5 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
guessed |
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"tags": [
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],
"url": "https://git.kernel.org/stable/c/fd819ad3ecf6f3c232a06b27423ce9ed8c20da89"
}
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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],
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"redhat_vex": {
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"current_release_date": "2026-11-05T12:23:02+00:00",
"cve": "CVE-2024-35887",
"id": "CVE-2024-35887",
"initial_release_date": "2024-05-19T00:00:00+00:00",
"product_status:known_affected": "42",
"product_status:known_not_affected": "157",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ax25: fix use-after-free bugs caused by ax25_ds_del_timer",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35887.json",
"version": "3"
},
"vulnrichment": {
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nax25: fix use-after-free bugs caused by ax25_ds_del_timer\n\nWhen the ax25 device is detaching, the ax25_dev_device_down()\ncalls ax25_ds_del_timer() to cleanup the slave_timer. When\nthe timer handler is running, the ax25_ds_del_timer() that\ncalls del_timer() in it will return directly. As a result,\nthe use-after-free bugs could happen, one of the scenarios\nis shown below:\n\n (Thread 1) | (Thread 2)\n | ax25_ds_timeout()\nax25_dev_device_down() |\n ax25_ds_del_timer() |\n del_timer() |\n ax25_dev_put() //FREE |\n | ax25_dev-\u003e //USE\n\nIn order to mitigate bugs, when the device is detaching, use\ntimer_shutdown_sync() to stop the timer."
}
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"value": "AV:A - The DAMA slave timer that is used after free is armed and repeatedly re-armed solely by frames from a remote AX.25 peer (SABM with the DAMA bit at net/ax25/ax25_in.c:407, and DAMA polls via ax25_ds_enquiry_response() \u2192 mod_timer()), reached over a point-to-point RF link or bpqether on the local Ethernet segment.\nAC:L - The attacker fully controls the racing side \u2014 keeping a DAMA-slave link up makes ax25_ds_timeout() fire every second and lets the attacker drive mod_timer() from the RX softirq at frame rate, so the window against ax25_dev_device_down()\u0027s non-synchronous del_timer() can be hammered until it is hit, and a single re-arm after the free leaves an armed timer in freed memory.\nPR:N - AX.25 has no authentication whatsoever \u2014 the attacker only needs to transmit frames to a listening AX.25 port to turn on DAMA slave mode and arm the device timer; no account or credential on the target is involved.\nUI:N - No victim action on attacker-supplied content is needed; the free is triggered by a routine port/interface teardown (script-driven port cycling, TNC/serial or bpqether underlying device going down, module unload) while the attacker-maintained timer is active.\nS:U - The corruption is confined to kernel heap memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed ax25_dev is a kfree\u0027d slab object that can be reallocated and read back through the still-live timer handler, and the surviving armed timer_list gives an attacker-influenced read of freed/reallocated memory usable for kernel address and data disclosure.\nI:H - mod_timer() on the freed object writes into reallocated memory, and the timer core later loads and calls -\u003efunction from the freed ax25_dev, yielding a heap-spray-based control-flow hijack primitive and arbitrary kernel memory modification.\nA:H - Even unexploited, dereferencing and re-arming a timer embedded in freed memory reliably causes slab corruption, list corruption, and kernel oops/panic, taking the system down."
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"cveId": "CVE-2024-35887",
"datePublished": "2024-05-19T08:34:43.507Z",
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}
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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.