In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netem: Actualizar sch->q.qlen antes de qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifica a la qdisc principal solo si la qdisc secundaria se vacía, por lo tanto, debemos reducir el backlog de la qdisc secundaria antes de llamarla. De lo contrario, perdería la oportunidad de llamar a cops->qlen_notify(), en el caso de DRR, resultó en UAF ya que DRR usa ->qlen_notify() para mantener su lista activa.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | HIGH |
| Integrity Impact | HIGH |
| Availability Impact | HIGH |
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Type: Secondary
Exploitability Score: 1.8
Impact Score: 5.9
| Source | Type | Description |
|---|---|---|
| 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary |
en
CWE-416
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36a02ebc0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd2dbcaaf40> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36b3c1800> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd369e21440> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd36041d9c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd384a64e80> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x7fd369d6e7c0> | Operating System |
| linux | linux_kernel | 6.14 | <built-in method update of dict object at 0x7fd36b3c27c0> | 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:6.14:rc1:*:*:*:*:*:* |