Bugzilla – Bug 1227939
VUL-0: CVE-2022-48779: kernel: net: mscc: ocelot: fix use-after-free in ocelot_vlan_del()
Last modified: 2024-07-18 11:16:04 UTC
Description =========== In the Linux kernel, the following vulnerability has been resolved: net: mscc: ocelot: fix use-after-free in ocelot_vlan_del() ocelot_vlan_member_del() will free the struct ocelot_bridge_vlan, so if this is the same as the port's pvid_vlan which we access afterwards, what we're accessing is freed memory. Fix the bug by determining whether to clear ocelot_port->pvid_vlan prior to calling ocelot_vlan_member_del(). The Linux kernel CVE team has assigned CVE-2022-48779 to this issue. Affected and fixed versions =========================== Issue introduced in 5.16 with commit d4004422f6f9 and fixed in 5.16.11 with commit c98bed60cdd7 Issue introduced in 5.16 with commit d4004422f6f9 and fixed in 5.17 with commit ef5764057540 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2022-48779 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/net/ethernet/mscc/ocelot.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/c98bed60cdd7f22237ae256cc9c1c3087206b8a2 https://git.kernel.org/stable/c/ef57640575406f57f5b3393cf57f457b0ace837e References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-48779 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-48779.mbox https://git.kernel.org/stable/c/c98bed60cdd7f22237ae256cc9c1c3087206b8a2 https://git.kernel.org/stable/c/ef57640575406f57f5b3393cf57f457b0ace837e