CVE-2023-53600
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-04

Last updated on: 2026-03-23

Assigner: kernel.org

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.
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Meta Information
Published
2025-10-04
Last Modified
2026-03-23
Generated
2026-06-16
AI Q&A
2025-10-04
EPSS Evaluated
2026-06-15
NVD
CVE-2023-53600
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.2 (inc) to 6.4.11 (inc)
iperf3 iperf3 *
linux linux_kernel 6.5.0-rc3
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.
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Executive Summary

This vulnerability occurs in the Linux kernel's handling of network tunnels. Specifically, when the kernel tries to emit an ICMP error in response to a nonlinear socket buffer (skb), it triggers a bug related to the ip_compute_csum() function, which cannot handle nonlinear skbs properly. This leads to a slab-out-of-bounds memory read error detected by KASAN (Kernel Address Sanitizer), causing the kernel to crash or become unstable. The fix avoids calling ip_compute_csum() on nonlinear skbs, preventing this error.

Impact Analysis

This vulnerability can cause the Linux kernel to crash or become unstable when processing certain network packets, specifically when generating ICMP errors for nonlinear socket buffers. This can lead to denial of service conditions, where network communication is disrupted or the system becomes unresponsive.

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