CVE-2024-36898 (GCVE-0-2024-36898)
Vulnerability from cvelistv5 – Published: 2024-05-30 15:29 – Updated: 2026-08-05 11:31
VLAI
EPSS
VEX
Title
gpiolib: cdev: fix uninitialised kfifo
Summary
In the Linux kernel, the following vulnerability has been resolved:
gpiolib: cdev: fix uninitialised kfifo
If a line is requested with debounce, and that results in debouncing
in software, and the line is subsequently reconfigured to enable edge
detection then the allocation of the kfifo to contain edge events is
overlooked. This results in events being written to and read from an
uninitialised kfifo. Read events are returned to userspace.
Initialise the kfifo in the case where the software debounce is
already active.
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-10 18:49 UTC
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
65cff70464068a823b3f4a28074000febdce0630 , < c87cc32bc48b187067e089b15ab7a6a7eed5767d
(git)
Affected: 65cff70464068a823b3f4a28074000febdce0630 , < 1a51e24404d77bb3307c1e39eee0d8e86febb1a5 (git) Affected: 65cff70464068a823b3f4a28074000febdce0630 , < 883e4bbf06eb5fb7482679e4edb201093e9f55a2 (git) Affected: 65cff70464068a823b3f4a28074000febdce0630 , < bd7139a70ee8d8ea872b223e043730cf6f5e2b0e (git) Affected: 65cff70464068a823b3f4a28074000febdce0630 , < ee0166b637a5e376118e9659e5b4148080f1d27e (git) |
guessed | |
| Linux | Linux |
Affected:
5.10
Unaffected: 0 , < 5.10 (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.91 , ≤ 6.1.* (semver) Unaffected: 6.6.31 , ≤ 6.6.* (semver) Unaffected: 6.8.10 , ≤ 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/ee0166b637a5e376118e9659e5b4148080f1d27e"
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"tags": [
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"url": "https://git.kernel.org/stable/c/1a51e24404d77bb3307c1e39eee0d8e86febb1a5"
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"tags": [
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"url": "https://git.kernel.org/stable/c/883e4bbf06eb5fb7482679e4edb201093e9f55a2"
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"tags": [
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"tags": [
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"url": "https://git.kernel.org/stable/c/ee0166b637a5e376118e9659e5b4148080f1d27e"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
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"description": [
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"lang": "en",
"value": "CWE-908"
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],
"source": "nvd@nist.gov",
"type": "Primary"
}
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}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-11-06T14:02:58+00:00",
"cve": "CVE-2024-36898",
"id": "CVE-2024-36898",
"initial_release_date": "2024-05-30T00:00:00+00:00",
"product_status:known_affected": "151",
"product_status:known_not_affected": "48",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: gpiolib: cdev: fix uninitialised kfifo",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-36898.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-02T03:43:50.051Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
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"references": [
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"url": "https://git.kernel.org/stable/c/1a51e24404d77bb3307c1e39eee0d8e86febb1a5"
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{
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"url": "https://git.kernel.org/stable/c/883e4bbf06eb5fb7482679e4edb201093e9f55a2"
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"url": "https://git.kernel.org/stable/c/ee0166b637a5e376118e9659e5b4148080f1d27e"
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"title": "CVE Program Container"
},
{
"metrics": [
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"other": {
"content": {
"id": "CVE-2024-36898",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-06-10T18:49:07.029417Z",
"version": "2.0.3"
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"type": "ssvc"
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],
"providerMetadata": {
"dateUpdated": "2024-06-10T18:49:12.126Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"cna": {
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"product": "Linux",
"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "65cff70464068a823b3f4a28074000febdce0630",
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{
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"status": "affected",
"version": "65cff70464068a823b3f4a28074000febdce0630",
"versionType": "git"
},
{
"lessThan": "883e4bbf06eb5fb7482679e4edb201093e9f55a2",
"status": "affected",
"version": "65cff70464068a823b3f4a28074000febdce0630",
"versionType": "git"
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{
"lessThan": "bd7139a70ee8d8ea872b223e043730cf6f5e2b0e",
"status": "affected",
"version": "65cff70464068a823b3f4a28074000febdce0630",
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"status": "affected",
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"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "5.10"
},
{
"lessThan": "5.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.91",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.31",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"version": "6.8.10",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.9",
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"vulnerable": true
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.91",
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"vulnerable": true
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{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: cdev: fix uninitialised kfifo\n\nIf a line is requested with debounce, and that results in debouncing\nin software, and the line is subsequently reconfigured to enable edge\ndetection then the allocation of the kfifo to contain edge events is\noverlooked. This results in events being written to and read from an\nuninitialised kfifo. Read events are returned to userspace.\n\nInitialise the kfifo in the case where the software debounce is\nalready active."
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"value": "AV:L - Exploitation requires opening the /dev/gpiochipN character device and issuing GPIO_V2_GET_LINE_IOCTL / GPIO_V2_LINE_SET_CONFIG_IOCTL plus read(), all local syscall interfaces. There is no remote or adjacent-network path into gpiolib-cdev.\nAC:L - The trigger is a deterministic, race-free ioctl sequence, and the attacker can generate the required edges themselves by flipping BIAS_PULL_UP/PULL_DOWN via SET_CONFIG or driving a loopback line. Software debouncing (gpiod_set_debounce returning -ENOTSUPP) and CONFIG_GPIO_CDEV are the default on essentially all GPIO controllers and embedded kernels.\nPR:L - No capability check exists anywhere along gpio_chrdev_open \u2192 gpio_ioctl \u2192 linereq_create \u2192 linereq_set_config \u2192 linereq_read; access is governed solely by file permissions on /dev/gpiochipN, typically root:gpio 0660. An unprivileged local user in the gpio group \u2014 the standard configuration on embedded, industrial, and single-board Linux systems whose applications drive GPIO from userspace \u2014 is sufficient.\nUI:N - The attacker performs every step unaided, including generating the GPIO edges via bias reconfiguration or a driven loopback line. No victim action is required at any point.\nS:U - The uninitialized kfifo, the leaked stack data, and the NULL dereference are all confined to the kernel\u0027s own security authority on the same host. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Every read() returns 48 bytes of uninitialized kernel stack from linereq_read\u0027s own frame directly to userspace, repeatable without limit, and the attacker can groom that stack region with preceding syscalls to steer what is disclosed. This yields kernel pointers, stack canaries, and residual syscall data \u2014 a KASLR/canary bypass and a broad kernel memory disclosure primitive.\nI:N - With esize=0 the kfifo write path copies zero bytes, and data is always NULL whenever mask is 0, so no kernel memory is modified. The bug produces disclosure and a fault, not a write primitive into valid kernel memory.\nA:H - Because the buggy branch commits edflags while leaving the fifo unallocated, an attacker supplying event_buffer_size=1 across two lines reaches kfifo_copy_in() with esize=48, mask=0, data=NULL, causing memcpy() to a NULL destination in workqueue context \u2014 a kernel oops. Any such crash is scored High."
}
]
}
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},
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},
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],
"title": "gpiolib: cdev: fix uninitialised kfifo",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-36898",
"datePublished": "2024-05-30T15:29:02.011Z",
"dateReserved": "2024-05-30T15:25:07.066Z",
"dateUpdated": "2026-08-05T11:31:54.352Z",
"state": "PUBLISHED"
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"dataVersion": "5.2"
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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.