CVE-2026-31428 (GCVE-0-2026-31428)
Vulnerability from cvelistv5
Published
2026-04-13 13:40
Modified
2026-04-13 13:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
__build_packet_message() manually constructs the NFULA_PAYLOAD netlink
attribute using skb_put() and skb_copy_bits(), bypassing the standard
nla_reserve()/nla_put() helpers. While nla_total_size(data_len) bytes
are allocated (including NLA alignment padding), only data_len bytes
of actual packet data are copied. The trailing nla_padlen(data_len)
bytes (1-3 when data_len is not 4-byte aligned) are never initialized,
leaking stale heap contents to userspace via the NFLOG netlink socket.
Replace the manual attribute construction with nla_reserve(), which
handles the tailroom check, header setup, and padding zeroing via
__nla_reserve(). The subsequent skb_copy_bits() fills in the payload
data on top of the properly initialized attribute.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: df6fb868d6118686805c2fa566e213a8f31c8e4f Version: df6fb868d6118686805c2fa566e213a8f31c8e4f Version: df6fb868d6118686805c2fa566e213a8f31c8e4f Version: df6fb868d6118686805c2fa566e213a8f31c8e4f Version: df6fb868d6118686805c2fa566e213a8f31c8e4f Version: df6fb868d6118686805c2fa566e213a8f31c8e4f |
||
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"status": "unaffected",
"version": "6.12.80",
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{
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"status": "unaffected",
"version": "6.18.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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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\nnetfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD\n\n__build_packet_message() manually constructs the NFULA_PAYLOAD netlink\nattribute using skb_put() and skb_copy_bits(), bypassing the standard\nnla_reserve()/nla_put() helpers. While nla_total_size(data_len) bytes\nare allocated (including NLA alignment padding), only data_len bytes\nof actual packet data are copied. The trailing nla_padlen(data_len)\nbytes (1-3 when data_len is not 4-byte aligned) are never initialized,\nleaking stale heap contents to userspace via the NFLOG netlink socket.\n\nReplace the manual attribute construction with nla_reserve(), which\nhandles the tailroom check, header setup, and padding zeroing via\n__nla_reserve(). The subsequent skb_copy_bits() fills in the payload\ndata on top of the properly initialized attribute."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-13T13:40:30.987Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482"
},
{
"url": "https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c"
},
{
"url": "https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a"
},
{
"url": "https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926"
},
{
"url": "https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5"
},
{
"url": "https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7"
}
],
"title": "netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31428",
"datePublished": "2026-04-13T13:40:30.987Z",
"dateReserved": "2026-03-09T15:48:24.089Z",
"dateUpdated": "2026-04-13T13:40:30.987Z",
"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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