riscv, bpf: Fix kernel stack corruption in tailcall with CFI

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92518
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:54 UTC
Updated2026-09-18 18:18:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: riscv, bpf: Fix kernel stack corruption in tailcall with CFI When CONFIG_CFI_CLANG is enabled, prog->bpf_func already skips the kcfi instruction during setup. Including it again in the tailcall jump offset causes it to jump over an extra 4 bytes, skipping the stack pointer adjustment, which will result in kernel stack corruption.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001620000 probability, percentile 0.057800000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 30a59cc79754fd9ff3f41b7ee2eb21da85988548 34b1bb33a025787e05f966e74de18cd36276f801 git Not specified
CNA Linux Linux affected 30a59cc79754fd9ff3f41b7ee2eb21da85988548 a6e11a81da3420fd37f1518d4f238c4d5784086e git Not specified
CNA Linux Linux affected 30a59cc79754fd9ff3f41b7ee2eb21da85988548 52fb1756ea1d2759dfef2d86245be00b05dac3a2 git Not specified
CNA Linux Linux affected fe5b68fdcec0f3d97a32f4c4acfef59cf90718f7 git Not specified
CNA Linux Linux affected 6.11.6 6.12 semver Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/52fb1756ea1d2759dfef2d86245be00b05dac3a2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a6e11a81da3420fd37f1518d4f238c4d5784086e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/34b1bb33a025787e05f966e74de18cd36276f801 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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