In the Linux kernel, the following vulnerability has been resolved: nfsd: Initialize ssc before laundromat_work to prevent NULL dereference In nfs4_state_start_net(), laundromat_work may access nfsd_ssc through nfs4_laundromat -> nfsd4_ssc_expire_umount. If nfsd_ssc isn't initialized, this can cause NULL pointer dereference. Normally the delayed start of laundromat_work allows sufficient time for nfsd_ssc initialization to complete. However, when the kernel waits too long for userspace responses (e.g. in nfs4_state_start_net -> nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done -> cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion path), the delayed work may start before nfsd_ssc initialization finishes. Fix this by moving nfsd_ssc initialization before starting laundromat_work.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: Inicializar ssc antes de laundromat_work para evitar la desreferencia de punteros NULL. En nfs4_state_start_net(), laundromat_work puede acceder a nfsd_ssc a través de nfs4_laundromat -> nfsd4_ssc_expire_umount. Si nfsd_ssc no se inicializa, esto puede causar la desreferencia de punteros NULL. Normalmente, el inicio retrasado de laundromat_work permite que la inicialización de nfsd_ssc se complete con tiempo suficiente. Sin embargo, cuando el núcleo espera demasiado tiempo las respuestas del espacio de usuario (p. ej., en la ruta nfs4_state_start_net -> nfsd4_end_grace -> nfsd4_record_grace_done -> nfsd4_cld_grace_done -> cld_pipe_upcall -> __cld_pipe_upcall -> wait_for_completion), el trabajo retrasado puede comenzar antes de que finalice la inicialización de nfsd_ssc. Para solucionar esto, mueva la inicialización de nfsd_ssc antes de iniciar laundromat_work.
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-476
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x702ba70f4800> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702b53f53500> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bde495780> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702ba70f46c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702ba70f7840> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bcbbf7f40> | Operating System |
| debian | debian_linux | 11.0 | <built-in method update of dict object at 0x702bdd4608c0> | 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:*:*:*:*:*:*:*:* |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |