CVE-2023-53600

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 5850c391fd7e25662334cb3cbf29a62bcbff1084affected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < e95808121953410db8c59f0abfde70ac0d34222caffected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5ccaffected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < fe6a9f7516735be9fdabab00e47ef7a3403a174daffected
LinuxLinux4cb47a8644cc9eb8ec81190a50e79e6530d0297f < 6a7ac3d20593865209dceb554d8b3f094c6bd940affected
LinuxLinux5.9affected
LinuxLinux0 < 5.9unaffected
LinuxLinux5.10.191 <= 5.10.*unaffected
LinuxLinux5.15.127 <= 5.15.*unaffected
LinuxLinux6.1.46 <= 6.1.*unaffected
LinuxLinux6.4.11 <= 6.4.*unaffected
LinuxLinux6.5 <= *unaffected

Weaknesses

References