{"id":"CVE-2023-53600","title":"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_co…","summary":"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_co…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-125"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.9, < 5.10.191","linux_kernel >= 5.11, < 5.15.127","linux_kernel >= 5.16, < 6.1.46","linux_kernel >= 6.2, < 6.4.11","linux_kernel = 6.5"],"patched":["linux_kernel 6.4.11"],"published":"2025-10-04","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:43.897","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53600","references":[{"url":"https://git.kernel.org/stable/c/5850c391fd7e25662334cb3cbf29a62bcbff1084","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e95808121953410db8c59f0abfde70ac0d34222c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fe6a9f7516735be9fdabab00e47ef7a3403a174d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00297,"epssPercentile":0.22226,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T21:35:49.694567Z"},"ingestedAt":"2026-10-15T22:48:25.411Z","slug":"CVE-2023-53600","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 5.9, < 5.10.191`\n- `linux_kernel >= 5.11, < 5.15.127`\n- `linux_kernel >= 5.16, < 6.1.46`\n- `linux_kernel >= 6.2, < 6.4.11`\n- `linux_kernel = 6.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.4.11`","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}