5.5

CVE-2021-47353

udf: Fix NULL pointer dereference in udf_symlink function

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

udf: Fix NULL pointer dereference in udf_symlink function

In function udf_symlink, epos.bh is assigned with the value returned
by udf_tgetblk. The function udf_tgetblk is defined in udf/misc.c
and returns the value of sb_getblk function that could be NULL.
Then, epos.bh is used without any check, causing a possible
NULL pointer dereference when sb_getblk fails.

This fix adds a check to validate the value of epos.bh.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.4.276
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.276
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.240
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.198
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.133
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.51
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.18
Linux ≫ Linux Kernel Version >= 5.13 < 5.13.3
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.31% 0.224
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/21bf1414580c36ffc8d8de043beb3508cf812238
Patch
https://git.kernel.org/stable/c/2f3d9ddd32a28803baa547e6274983b67d5e287c
Patch
https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5
Patch
https://git.kernel.org/stable/c/371566f63cbd0bb6fbb25b8fe9d5798268d35af9
Patch
https://git.kernel.org/stable/c/5150877e4d99f85057a458daac7cd7c01005d5c6
Patch
https://git.kernel.org/stable/c/80d505aee6398cf8beb72475c7edcf1733c1c68b
Patch
https://git.kernel.org/stable/c/aebed6b19e51a34003d998da5ebb1dfdd2cb1d02
Patch
https://git.kernel.org/stable/c/baea588a42d675e35daeaddd10fbc9700550bc4d
Patch
https://git.kernel.org/stable/c/fa236c2b2d4436d9f19ee4e5d5924e90ffd7bb43
Patch