Bug 1226695 (CVE-2022-48757)

Summary: VUL-0: CVE-2022-48757: kernel: net: fix information leakage in /proc/net/ptype
Product: [Novell Products] SUSE Security Incidents Reporter: SMASH SMASH <smash_bz>
Component: IncidentsAssignee: Davide Benini <davide.benini>
Status: NEW --- QA Contact: Security Team bot <security-team>
Severity: Normal    
Priority: P3 - Medium CC: davide.benini, denis.kirjanov, gabriele.sonnu, miroslav.franc, mkubecek
Version: unspecified   
Target Milestone: ---   
Hardware: Other   
OS: Other   
URL: https://smash.suse.de/issue/411597/
Whiteboard: CVSSv3.1:SUSE:CVE-2022-48757:5.5:(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 2024-06-21 08:27:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: fix information leakage in /proc/net/ptype

In one net namespace, after creating a packet socket without binding
it to a device, users in other net namespaces can observe the new
`packet_type` added by this packet socket by reading `/proc/net/ptype`
file. This is minor information leakage as packet socket is
namespace aware.

Add a net pointer in `packet_type` to keep the net namespace of
of corresponding packet socket. In `ptype_seq_show`, this net pointer
must be checked when it is not NULL.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-48757
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-48757.mbox
https://git.kernel.org/stable/c/8f88c78d24f6f346919007cd459fd7e51a8c7779
https://git.kernel.org/stable/c/be1ca30331c7923c6f376610c1bd6059be9b1908
https://git.kernel.org/stable/c/c38023032a598ec6263e008d62c7f02def72d5c7
https://git.kernel.org/stable/c/b67ad6170c0ea87391bb253f35d1f78857736e54
https://git.kernel.org/stable/c/e372ecd455b6ebc7720f52bf4b5f5d44d02f2092
https://git.kernel.org/stable/c/db044d97460ea792110eb8b971e82569ded536c6
https://git.kernel.org/stable/c/e43669c77cb3a742b7d84ecdc7c68c4167a7709b
https://git.kernel.org/stable/c/839ec7039513a4f84bfbaff953a9393471176bee
https://git.kernel.org/stable/c/47934e06b65637c88a762d9c98329ae6e3238888
https://www.cve.org/CVERecord?id=CVE-2022-48757
https://bugzilla.redhat.com/show_bug.cgi?id=2293383