7.5

CVE-2021-47259

NFS: Fix use-after-free in nfs4_init_client()

In the Linux kernel, the following vulnerability has been resolved:

NFS: Fix use-after-free in nfs4_init_client()

KASAN reports a use-after-free when attempting to mount two different
exports through two different NICs that belong to the same server.

Olga was able to hit this with kernels starting somewhere between 5.7
and 5.10, but I traced the patch that introduced the clear_bit() call to
4.13. So something must have changed in the refcounting of the clp
pointer to make this call to nfs_put_client() the very last one.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.13 < 4.14.237
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.195
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.126
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.44
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.11
Linux ≫ Linux Kernel Version5.13 Updaterc1
Linux ≫ Linux Kernel Version5.13 Updaterc2
Linux ≫ Linux Kernel Version5.13 Updaterc3
Linux ≫ Linux Kernel Version5.13 Updaterc4
Linux ≫ Linux Kernel Version5.13 Updaterc5
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.11% 0.616
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.5 1.6 5.9
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/3e3c7ebbfac152d08be75c92802a64a1f6471a15
Patch
https://git.kernel.org/stable/c/42c10b0db064e45f5c5ae7019bbf2168ffab766c
Patch
https://git.kernel.org/stable/c/476bdb04c501fc64bf3b8464ffddefc8dbe01577
Patch
https://git.kernel.org/stable/c/72651c6579a25317a90536181d311c663d0329ab
Patch
https://git.kernel.org/stable/c/c3b6cf64dfe4ef96e7341508d50d6998da7062c7
Patch
https://git.kernel.org/stable/c/c7eab9e2d7b4e983ce280276fb920af649955897
Patch