netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
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.
CVE-2026-31428
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31428
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "7f3e5d72455936f42709116fabeca3bb216cda62",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "21d8efda029948d3666b0db5afcc0d36c0984aae",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "fc961dd7272b5e4a462999635e44a4770d7f2482",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "a8365d1064ded323797c5e28e91070c52f44b76c",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "a2f6ff3444b663d6cfa63eadd61327a18592885a",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "c9f6c51d36482805ac3ffadb9663fe775a13e926",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "7eff72968161fb8ddb26113344de3b92fb7d7ef5",
"versionType": "git"
},
{
"status": "affected",
"version": "df6fb868d6118686805c2fa566e213a8f31c8e4f",
"lessThan": "52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nfnetlink_log.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.24",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.131",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.80",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.21",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.11",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nfnetlink_log.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31428
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28276 · Revision 1
- Added to Heist Feed
- Publisher date