bpf: Reject non-scalar bpf_loop iteration counts

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98007
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:28 UTC
Updated2026-09-25 11:17:28 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject non-scalar bpf_loop iteration counts bpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged programs may pass pointer values to such arguments, so check_func_arg() lets a pointer-valued R1 reach the helper-specific checks. Since commit bb124da69c47 ("bpf: keep track of max number of bpf_loop callback iterations"), the verifier marks R1 precise and reads its upper bound to limit callback simulation. Precision backtracking only accepts scalar registers, so passing a pointer instead triggers the "backtracking misuse" verifier warning. Kernels with panic_on_warn enabled subsequently panic. Introduce ARG_SCALAR for helper arguments that only accept scalar values and use it for bpf_loop() nr_loops. Generic helper argument validation then rejects pointers before loop inlining and precision processing.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.053860000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bb124da69c47dd98d69361ec13244ece50bec63e 656d40d1ca228ee21a9b3280432479fc9eae75ab git Not specified
CNA Linux Linux affected bb124da69c47dd98d69361ec13244ece50bec63e e2e1161e03fecff6d2229a81b024337144bfcd97 git Not specified
CNA Linux Linux affected bb124da69c47dd98d69361ec13244ece50bec63e f8ae8275c721334ee50fafdd986fb83294eb941a git Not specified
CNA Linux Linux affected bb124da69c47dd98d69361ec13244ece50bec63e c3fd8e5fd100f122bad503bdc0e9277219533253 git Not specified
CNA Linux Linux affected bfc5c19b4b48840627af0d0f1c8f4461b276e508 git Not specified
CNA Linux Linux affected 6.6.15 6.7 semver Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e2e1161e03fecff6d2229a81b024337144bfcd97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3fd8e5fd100f122bad503bdc0e9277219533253 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/656d40d1ca228ee21a9b3280432479fc9eae75ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f8ae8275c721334ee50fafdd986fb83294eb941a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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