In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: avoid leaking percpu counter pointers The native and compat get-entries paths copy the fixed rule entry header from the kernelized rule blob to userspace before overwriting the entry's counter fields with a sanitized counter snapshot. On SMP kernels, entry->counters.pcnt contains the percpu allocation address used by x_tables rule counters. A caller can provide a userspace buffer that faults during the initial fixed-header copy after pcnt has been copied but before the later sanitized counter copy runs. The syscall then returns -EFAULT while leaving the raw percpu pointer in userspace. Copy only the fixed entry prefix before counters from the kernelized rule blob, then copy the sanitized counter snapshot into the counter field. Apply this ordering to the IPv4, IPv6, and ARP native and compat get-entries implementations so a fault cannot expose the internal percpu counter pointer.
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
NVD-CWE-noinfo
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| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2364d6a440> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24245b8440> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24245b9140> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24246535c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d2364d68740> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d24243de0c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7d236440c040> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d23a52f4c00> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d24247355c0> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d2364d6bb80> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d24245bbc80> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d2364d68100> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d2364d6b7c0> | Operating System |
| linux | linux_kernel | 7.1 | <built-in method update of dict object at 0x7d2364d6a2c0> | 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:7.1:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.1:rc6:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:7.1:rc7:*:*:*:*:*:* |