by Kastro
Paper/Archive/CVE-2023-53600

CVE-2023-53600

Linux Linux — tunnels: fix kasan splat when generating ipv4 pmtu error

EPSS 0.3%CVSS 9.1
critical.is priorityof 100
32
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 22.3.223 × 204.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Linux4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 5850c391fd7e25662334cb3cbf29a62bcbff10845850c391fd7e25662334cb3cbf29a62bcbff1084CNA
Linux4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < e95808121953410db8c59f0abfde70ac0d34222ce95808121953410db8c59f0abfde70ac0d34222cCNA
Linux4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5ccda5f42a6e7485fbb7a6dbd6a2b3045e19e4df5ccCNA
Linux4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < fe6a9f7516735be9fdabab00e47ef7a3403a174dfe6a9f7516735be9fdabab00e47ef7a3403a174dCNA
Linux4cb47a8644cc9eb8ec81190a50e79e6530d0297f – < 6a7ac3d20593865209dceb554d8b3f094c6bd9406a7ac3d20593865209dceb554d8b3f094c6bd940CNA
Linux5.95.10.191CNA

Scores by source

Linux (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgit.kernel.org/stable/c/5850c391fd7e25662334cb3cbf29a62bcbff1084refgit.kernel.org/stable/c/e95808121953410db8c59f0abfde70ac0d34222crefgit.kernel.org/stable/c/da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5ccrefgit.kernel.org/stable/c/fe6a9f7516735be9fdabab00e47ef7a3403a174drefgit.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940