bpf: Reject non-scalar bpf_loop iteration counts
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.
CVE-2026-98007
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98007
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "bfc5c19b4b48840627af0d0f1c8f4461b276e508",
"lessThan": "2ff38b3552af53238aee6c877ae64cc798d46fce",
"versionType": "git"
},
{
"status": "affected",
"version": "bb124da69c47dd98d69361ec13244ece50bec63e",
"lessThan": "656d40d1ca228ee21a9b3280432479fc9eae75ab",
"versionType": "git"
},
{
"status": "affected",
"version": "bb124da69c47dd98d69361ec13244ece50bec63e",
"lessThan": "e2e1161e03fecff6d2229a81b024337144bfcd97",
"versionType": "git"
},
{
"status": "affected",
"version": "bb124da69c47dd98d69361ec13244ece50bec63e",
"lessThan": "f8ae8275c721334ee50fafdd986fb83294eb941a",
"versionType": "git"
},
{
"status": "affected",
"version": "bb124da69c47dd98d69361ec13244ece50bec63e",
"lessThan": "c3fd8e5fd100f122bad503bdc0e9277219533253",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.15",
"lessThan": "6.6.158",
"versionType": "semver"
}
],
"programFiles": [
"include/linux/bpf.h",
"kernel/bpf/bpf_iter.c",
"kernel/bpf/verifier.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/linux/bpf.h",
"kernel/bpf/bpf_iter.c",
"kernel/bpf/verifier.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98007
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38134 · Revision 1
- Added to Heist Feed
- Publisher date