CVE-2023-53600 (GCVE-0-2023-53600)
Vulnerability from cvelistv5
Published
2025-10-04 15:44
Modified
2025-10-04 15:44
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
{
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},
{
"url": "https://git.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940"
}
],
"title": "tunnels: fix kasan splat when generating ipv4 pmtu error",
"x_generator": {
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"assignerShortName": "Linux",
"cveId": "CVE-2023-53600",
"datePublished": "2025-10-04T15:44:11.775Z",
"dateReserved": "2025-10-04T15:40:38.479Z",
"dateUpdated": "2025-10-04T15:44:11.775Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.1",
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}