CVE-2026-23359 (GCVE-0-2026-23359)
Vulnerability from cvelistv5
Published
2026-03-25 10:27
Modified
2026-04-18 08:58
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix stack-out-of-bounds write in devmap
get_upper_ifindexes() iterates over all upper devices and writes their
indices into an array without checking bounds.
Also the callers assume that the max number of upper devices is
MAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack,
but that assumption is not correct and the number of upper devices could
be larger than MAX_NEST_DEV (e.g., many macvlans), causing a
stack-out-of-bounds write.
Add a max parameter to get_upper_ifindexes() to avoid the issue.
When there are too many upper devices, return -EOVERFLOW and abort the
redirect.
To reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with
an XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.
Then send a packet to the device to trigger the XDP redirect path.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: aeea1b86f9363f3feabb496534d886f082a89f21 Version: aeea1b86f9363f3feabb496534d886f082a89f21 Version: aeea1b86f9363f3feabb496534d886f082a89f21 Version: aeea1b86f9363f3feabb496534d886f082a89f21 Version: aeea1b86f9363f3feabb496534d886f082a89f21 Version: aeea1b86f9363f3feabb496534d886f082a89f21 Version: aeea1b86f9363f3feabb496534d886f082a89f21 |
||
{
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{
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"status": "unaffected",
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"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
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],
"cpeApplicability": [
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"negate": false,
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stack-out-of-bounds write in devmap\n\nget_upper_ifindexes() iterates over all upper devices and writes their\nindices into an array without checking bounds.\n\nAlso the callers assume that the max number of upper devices is\nMAX_NEST_DEV and allocate excluded_devices[1+MAX_NEST_DEV] on the stack,\nbut that assumption is not correct and the number of upper devices could\nbe larger than MAX_NEST_DEV (e.g., many macvlans), causing a\nstack-out-of-bounds write.\n\nAdd a max parameter to get_upper_ifindexes() to avoid the issue.\nWhen there are too many upper devices, return -EOVERFLOW and abort the\nredirect.\n\nTo reproduce, create more than MAX_NEST_DEV(8) macvlans on a device with\nan XDP program attached using BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS.\nThen send a packet to the device to trigger the XDP redirect path."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-18T08:58:10.801Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/88df604f0d16a692867582350ce3f2fcd22243f1"
},
{
"url": "https://git.kernel.org/stable/c/5000e40acc8d0c36ab709662e32120986ac22e7e"
},
{
"url": "https://git.kernel.org/stable/c/8a95fb9df1105b1618872c2846a6c01e3ba20b45"
},
{
"url": "https://git.kernel.org/stable/c/d2c31d8e03d05edc16656e5ffe187f0d1da763d7"
},
{
"url": "https://git.kernel.org/stable/c/75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2"
},
{
"url": "https://git.kernel.org/stable/c/ca831567908fd3f73cf97d8a6c09a5054697a182"
},
{
"url": "https://git.kernel.org/stable/c/b7bf516c3ecd9a2aae2dc2635178ab87b734fef1"
}
],
"title": "bpf: Fix stack-out-of-bounds write in devmap",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-23359",
"datePublished": "2026-03-25T10:27:43.070Z",
"dateReserved": "2026-01-13T15:37:46.000Z",
"dateUpdated": "2026-04-18T08:58:10.801Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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