Description
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.
Product status
df6fb868d6118686805c2fa566e213a8f31c8e4f (git) before fc961dd7272b5e4a462999635e44a4770d7f2482
df6fb868d6118686805c2fa566e213a8f31c8e4f (git) before a8365d1064ded323797c5e28e91070c52f44b76c
df6fb868d6118686805c2fa566e213a8f31c8e4f (git) before a2f6ff3444b663d6cfa63eadd61327a18592885a
df6fb868d6118686805c2fa566e213a8f31c8e4f (git) before c9f6c51d36482805ac3ffadb9663fe775a13e926
df6fb868d6118686805c2fa566e213a8f31c8e4f (git) before 7eff72968161fb8ddb26113344de3b92fb7d7ef5
df6fb868d6118686805c2fa566e213a8f31c8e4f (git) before 52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7
2.6.24
Any version before 2.6.24
6.1.168 (semver)
6.6.131 (semver)
6.12.80 (semver)
6.18.21 (semver)
6.19.11 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/…c/fc961dd7272b5e4a462999635e44a4770d7f2482
git.kernel.org/…c/a8365d1064ded323797c5e28e91070c52f44b76c
git.kernel.org/…c/a2f6ff3444b663d6cfa63eadd61327a18592885a
git.kernel.org/…c/c9f6c51d36482805ac3ffadb9663fe775a13e926
git.kernel.org/…c/7eff72968161fb8ddb26113344de3b92fb7d7ef5
git.kernel.org/…c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7
