Vulnerability details
CVE-2023-53600
tunnels: fix kasan splat when generating ipv4 pmtu error
Official description
In the Linux kernel, the following vulnerability has been resolved: tunnels: fix kasan splat when generating ipv4 pmtu error If we try to emit an icmp error in response to a nonliner skb, we get BUG: KASAN: slab-out-of-bounds in ip_compute_csum+0x134/0x220 Read of size 4 at addr ffff88811c50db00 by task iperf3/1691 CPU: 2 PID: 1691 Comm: iperf3 Not tainted 6.5.0-rc3+ #309 [..] kasan_report+0x105/0x140 ip_compute_csum+0x134/0x220 iptunnel_pmtud_build_icmp+0x554/0x1020 skb_tunnel_check_pmtu+0x513/0xb80 vxlan_xmit_one+0x139e/0x2ef0 vxlan_xmit+0x1867/0x2760 dev_hard_start_xmit+0x1ee/0x4f0 br_dev_queue_push_xmit+0x4d1/0x660 [..] ip_compute_csum() cannot deal with nonlinear skbs, so avoid it. After this change, splat is gone and iperf3 is no longer stuck.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 5.9 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 4cb47a8644cc9eb8ec81190a50e79e6530d0297f ≤ v < 5850c391fd7e25662334cb3cbf29a62bcbff1084 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 4cb47a8644cc9eb8ec81190a50e79e6530d0297f ≤ v < e95808121953410db8c59f0abfde70ac0d34222c | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 4cb47a8644cc9eb8ec81190a50e79e6530d0297f ≤ v < da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 4cb47a8644cc9eb8ec81190a50e79e6530d0297f ≤ v < fe6a9f7516735be9fdabab00e47ef7a3403a174d | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 4cb47a8644cc9eb8ec81190a50e79e6530d0297f ≤ v < 6a7ac3d20593865209dceb554d8b3f094c6bd940 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://git.kernel.org/stable/c/5850c391fd7e25662334cb3cbf29a62bcbff1084
- https://git.kernel.org/stable/c/e95808121953410db8c59f0abfde70ac0d34222c
- https://git.kernel.org/stable/c/da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc
- https://git.kernel.org/stable/c/fe6a9f7516735be9fdabab00e47ef7a3403a174d
- https://git.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940
Details
- Published
- 2025-10-04
- Last updated
- 2026-10-16
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- —