Bug 1220952 (CVE-2021-47086)

Summary:	VUL-0: CVE-2021-47086: kernel: phonet/pep: refuse to enable an unbound pipe
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	NEW ---	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	andrea.mattiazzo, denis.kirjanov, mhocko, pmladek
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/396232/
Whiteboard:	CVSSv3.1:SUSE:CVE-2021-47086:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-03-05 10:22:56 UTC

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

phonet/pep: refuse to enable an unbound pipe

This ioctl() implicitly assumed that the socket was already bound to
a valid local socket name, i.e. Phonet object. If the socket was not
bound, two separate problems would occur:

1) We'd send an pipe enablement request with an invalid source object.
2) Later socket calls could BUG on the socket unexpectedly being
   connected yet not bound to a valid object.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47086
https://www.cve.org/CVERecord?id=CVE-2021-47086
https://lore.kernel.org/linux-cve-announce/2024030455-CVE-2021-47086-cdaa@gregkh/

Patch:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=75a2f3152009

Comment 1 Andrea Mattiazzo 2024-03-05 10:28:27 UTC

Tracking as affected:
-cve/linux-5.14

cve/linux-4.12, cve/linux-4.4, cve/linux-5.3 not affected due to CONFIG_PHONET not set

SLE15-SP6 and stable already fixed

Comment 3 Petr Mladek 2024-03-05 14:48:02 UTC

Michal, could you please look at it?