CVE-2026-98007 (GCVE-0-2026-98007)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-10-03 11:01
VLAI
Title
bpf: Reject non-scalar bpf_loop iteration counts
Summary
In 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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7100 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bfc5c19b4b48840627af0d0f1c8f4461b276e508 , < 2ff38b3552af53238aee6c877ae64cc798d46fce (git)
Affected: bb124da69c47dd98d69361ec13244ece50bec63e , < 656d40d1ca228ee21a9b3280432479fc9eae75ab (git)
Affected: bb124da69c47dd98d69361ec13244ece50bec63e , < e2e1161e03fecff6d2229a81b024337144bfcd97 (git)
Affected: bb124da69c47dd98d69361ec13244ece50bec63e , < f8ae8275c721334ee50fafdd986fb83294eb941a (git)
Affected: bb124da69c47dd98d69361ec13244ece50bec63e , < c3fd8e5fd100f122bad503bdc0e9277219533253 (git)
Affected: 6.6.15 , < 6.6.158 (semver)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc2 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject non-scalar bpf_loop iteration counts\n\nbpf_loop() declares its nr_loops argument as ARG_ANYTHING. Privileged\nprograms may pass pointer values to such arguments, so check_func_arg()\nlets a pointer-valued R1 reach the helper-specific checks.\n\nSince commit bb124da69c47 (\"bpf: keep track of max number of bpf_loop\ncallback iterations\"), the verifier marks R1 precise and reads its upper\nbound to limit callback simulation. Precision backtracking only accepts\nscalar registers, so passing a pointer instead triggers the \"backtracking\nmisuse\" verifier warning. Kernels with panic_on_warn enabled subsequently\npanic.\n\nIntroduce ARG_SCALAR for helper arguments that only accept scalar values\nand use it for bpf_loop() nr_loops. Generic helper argument validation then\nrejects pointers before loop inlining and precision processing."
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}



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