bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge
In the Linux kernel, the following vulnerability has been resolved: bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge Nicholas Carlini reported a bug in precision backtracking mechanism for BPF_LD | BPF_{IND,ABS} instructions. These instructions are modelled as two branches: - fallthrough; - implicit exit from current subprogram. The implicit exit case was not handled by the backtrack_insn() function. When backtracking such a path backtrack_insn() did not call bt_subprog_enter(), which meant that backtracking continued manipulating precision marks in a caller frame, while looking at instructions in a callee frame. This lead to segmentation faults during verification (see the selftest), or unsound state pruning.
CVE-2026-98085
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-2026-98085
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": "37ad2bb11e9de92cb7b94548705eeedd87f7d392",
"lessThan": "19cca7c36055906b3cff3e297618ee8a50cde25d",
"versionType": "git"
},
{
"status": "affected",
"version": "8674e2db06cff6b50f2216eed9a761d15425bb34",
"lessThan": "12c064bcfa56e3631be9f5336ee113b7f849959a",
"versionType": "git"
},
{
"status": "affected",
"version": "ce01a4e5cfac7adbe0be565f90cd32ecbb2f8337",
"lessThan": "a0cd9e22f8faed30a8da8be357c51bd8b3074ee9",
"versionType": "git"
},
{
"status": "affected",
"version": "ee861486e377edc55361c08dcbceab3f6b6577bd",
"lessThan": "671b7b9a660ef15b25faa3df161205b9dc8d1eb2",
"versionType": "git"
},
{
"status": "affected",
"version": "ee861486e377edc55361c08dcbceab3f6b6577bd",
"lessThan": "387b1baefbb776e3f48dc2261e77a49213f470f7",
"versionType": "git"
},
{
"status": "affected",
"version": "928d354ae3557e8f755a227e67be88034eb3cd7f",
"versionType": "git"
},
{
"status": "affected",
"version": "8a800497d9f6c2ec9c2c1ba7b71d0ac2ea7f7bbe",
"versionType": "git"
},
{
"status": "affected",
"version": "de1055e7f9e67af32b1f3376066272b04e5223c0",
"versionType": "git"
},
{
"status": "affected",
"version": "d846d83bdacbd8f14fc45c63b8c1d22608452e1c",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.148",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.101",
"lessThan": "6.12.114",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.42",
"lessThan": "6.18.57",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.265",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.216",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.183",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "7.0.10",
"lessThan": "7.1",
"versionType": "semver"
}
],
"programFiles": [
"kernel/bpf/backtrack.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"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": [
"kernel/bpf/backtrack.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98085
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48850 · Revision 1
- Added to Heist Feed
- Publisher date