{"id":"CVE-2023-53600","summary":"tunnels: fix kasan splat when generating ipv4 pmtu error","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: fix kasan splat when generating ipv4 pmtu error\n\nIf we try to emit an icmp error in response to a nonliner skb, we get\n\nBUG: KASAN: slab-out-of-bounds in ip_compute_csum+0x134/0x220\nRead of size 4 at addr ffff88811c50db00 by task iperf3/1691\nCPU: 2 PID: 1691 Comm: iperf3 Not tainted 6.5.0-rc3+ #309\n[..]\n kasan_report+0x105/0x140\n ip_compute_csum+0x134/0x220\n iptunnel_pmtud_build_icmp+0x554/0x1020\n skb_tunnel_check_pmtu+0x513/0xb80\n vxlan_xmit_one+0x139e/0x2ef0\n vxlan_xmit+0x1867/0x2760\n dev_hard_start_xmit+0x1ee/0x4f0\n br_dev_queue_push_xmit+0x4d1/0x660\n [..]\n\nip_compute_csum() cannot deal with nonlinear skbs, so avoid it.\nAfter this change, splat is gone and iperf3 is no longer stuck.","modified":"2026-04-02T09:44:33.319444Z","published":"2025-10-04T15:44:11.775Z","related":["SUSE-SU-2025:21040-1","SUSE-SU-2025:21052-1","SUSE-SU-2025:21056-1","SUSE-SU-2025:21064-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4128-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4140-1","SUSE-SU-2025:4141-1","SUSE-SU-2025:4301-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53600.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5850c391fd7e25662334cb3cbf29a62bcbff1084"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e95808121953410db8c59f0abfde70ac0d34222c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fe6a9f7516735be9fdabab00e47ef7a3403a174d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53600.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53600"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4cb47a8644cc9eb8ec81190a50e79e6530d0297f"},{"fixed":"5850c391fd7e25662334cb3cbf29a62bcbff1084"},{"fixed":"e95808121953410db8c59f0abfde70ac0d34222c"},{"fixed":"da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc"},{"fixed":"fe6a9f7516735be9fdabab00e47ef7a3403a174d"},{"fixed":"6a7ac3d20593865209dceb554d8b3f094c6bd940"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53600.json"}}],"schema_version":"1.7.5"}