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.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-908
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24245bac00> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23af2be680> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d242a706a80> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23af2bf9c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24245bbf00> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24245ba600> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d23a5985200> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23a5984b00> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23af2be9c0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d24245bb080> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d24247c17c0> | Operating System |
| linux | linux_kernel | 7.0 | <built-in method update of dict object at 0x7d23beb169c0> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |