tunnels: fix kasan splat when generating ipv4 pmtu error

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2023-53600
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-04 16:15:56 UTC
Updated2026-08-04 10:19:14 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Problem Types: CWE-125

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f 5850c391fd7e25662334cb3cbf29a62bcbff1084 git Not specified
CNA Linux Linux affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f e95808121953410db8c59f0abfde70ac0d34222c git Not specified
CNA Linux Linux affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc git Not specified
CNA Linux Linux affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f fe6a9f7516735be9fdabab00e47ef7a3403a174d git Not specified
CNA Linux Linux affected 4cb47a8644cc9eb8ec81190a50e79e6530d0297f 6a7ac3d20593865209dceb554d8b3f094c6bd940 git Not specified
CNA Linux Linux affected 5.9 Not specified
CNA Linux Linux unaffected 5.9 semver Not specified
CNA Linux Linux unaffected 5.10.191 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.127 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.46 6.1.* semver Not specified
CNA Linux Linux unaffected 6.4.11 6.4.* semver Not specified
CNA Linux Linux unaffected 6.5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/da5f42a6e7485fbb7a6dbd6a2b3045e19e4df5cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6a7ac3d20593865209dceb554d8b3f094c6bd940 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e95808121953410db8c59f0abfde70ac0d34222c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fe6a9f7516735be9fdabab00e47ef7a3403a174d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5850c391fd7e25662334cb3cbf29a62bcbff1084 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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