Skip to content
Heist/ feed
Unrated

bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
Read the original announcement