CVE-2021-47507
In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix nsfd startup race (again) Commit bd5ae9288d64 ("nfsd: register pernet ops last, unregister first") has re-opened rpc_pipefs_event() race against nfsd_net_id registration…
Does this matter?
Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix nsfd startup race (again) Commit bd5ae9288d64 ("nfsd: register pernet ops last, unregister first") has re-opened rpc_pipefs_event() race against nfsd_net_id registration (register_pernet_subsys()) which has been fixed by commit bb7ffbf29e76 ("nfsd: fix nsfd startup race triggering BUG_ON"). Restore the order of register_pernet_subsys() vs register_cld_notifier(). Add WARN_ON() to prevent a future regression. Crash info: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000012 CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1 pc : rpc_pipefs_event+0x54/0x120 [nfsd] lr : rpc_pipefs_event+0x48/0x120 [nfsd] Call trace: rpc_pipefs_event+0x54/0x120 [nfsd] blocking_notifier_call_chain rpc_fill_super get_tree_keyed rpc_fs_get_tree vfs_get_tree do_mount ksys_mount __arm64_sys_mount el0_svc_handler el0_svc
- CVSS 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.19% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/8bf902fee5893cfc2f04a698abab47629699ae9aPatch
- https://git.kernel.org/stable/c/b10252c7ae9c9d7c90552f88b544a44ee773af64Patch
- https://git.kernel.org/stable/c/c520943a00ad5015704969ad3304c956bcd49d25Patch
- https://git.kernel.org/stable/c/f5734b1714ca355703e9ea8fb61d04beff1790b9Patch
- https://git.kernel.org/stable/c/8bf902fee5893cfc2f04a698abab47629699ae9aPatch
- https://git.kernel.org/stable/c/b10252c7ae9c9d7c90552f88b544a44ee773af64Patch
- https://git.kernel.org/stable/c/c520943a00ad5015704969ad3304c956bcd49d25Patch
- https://git.kernel.org/stable/c/f5734b1714ca355703e9ea8fb61d04beff1790b9Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.