Vulnerability CVE-2021-22555
Published: 2021-07-07

Description:
A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space

See advisories in our WLB2 database:
Topic
Author
Date
High
Linux Kernel Netfilter Heap Out-Of-Bounds Write
Andy Nguyen
16.07.2021
Med.
Linux Kernel 2.6.19 < 5.9 Netfilter Local Privilege Escalation
Nguyen
23.07.2021
High
Netfilter x_tables Heap Out-Of-Bounds Write / Privilege Escalation
Brendan Coles
09.10.2021

Type:

CWE-787

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.6/10
6.4/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Linux -> Linux kernel 

 References:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d
https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21
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