CVE-2023-4194
This issue could allow a local user to bypass network filters and gain unauthorized access to some resources.
Does this matter?
Lower severity and a low EPSS score (0.27%). Track it; it rarely justifies an emergency change on its own.
Description
A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 0.27% probability · 20th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-843, CWE-863
- Affected
- linux/linux kernel · redhat/enterprise linux · fedoraproject/fedora · debian/debian linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/errata/RHSA-2023:6583Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-4194Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2229498Issue Tracking, Third Party Advisory
- https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
- https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
- https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2023:6583Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2023-4194Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2229498Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q/
- https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
- https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
- https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com/Mailing List, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20231027-0002/
- https://www.debian.org/security/2023/dsa-5480
- https://www.debian.org/security/2023/dsa-5492
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.