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

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Summary

CVECVE-2026-98085
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:38 UTC
Updated2026-09-25 11:17:38 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ee861486e377edc55361c08dcbceab3f6b6577bd 671b7b9a660ef15b25faa3df161205b9dc8d1eb2 git Not specified
CNA Linux Linux affected ee861486e377edc55361c08dcbceab3f6b6577bd 387b1baefbb776e3f48dc2261e77a49213f470f7 git Not specified
CNA Linux Linux affected 928d354ae3557e8f755a227e67be88034eb3cd7f git Not specified
CNA Linux Linux affected 8a800497d9f6c2ec9c2c1ba7b71d0ac2ea7f7bbe git Not specified
CNA Linux Linux affected de1055e7f9e67af32b1f3376066272b04e5223c0 git Not specified
CNA Linux Linux affected 37ad2bb11e9de92cb7b94548705eeedd87f7d392 git Not specified
CNA Linux Linux affected 8674e2db06cff6b50f2216eed9a761d15425bb34 git Not specified
CNA Linux Linux affected ce01a4e5cfac7adbe0be565f90cd32ecbb2f8337 git Not specified
CNA Linux Linux affected d846d83bdacbd8f14fc45c63b8c1d22608452e1c git Not specified
CNA Linux Linux affected 5.10.265 5.11 semver Not specified
CNA Linux Linux affected 5.15.216 5.16 semver Not specified
CNA Linux Linux affected 6.1.183 6.2 semver Not specified
CNA Linux Linux affected 6.6.148 6.7 semver Not specified
CNA Linux Linux affected 6.12.101 6.13 semver Not specified
CNA Linux Linux affected 6.18.42 6.19 semver Not specified
CNA Linux Linux affected 7.0.10 7.1 semver Not specified
CNA Linux Linux affected 7.1 Not specified
CNA Linux Linux unaffected 7.1 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/387b1baefbb776e3f48dc2261e77a49213f470f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/671b7b9a660ef15b25faa3df161205b9dc8d1eb2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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