CVE-2026-98085

Description

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.

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Produits concernés

• Linux

Références

• https://git.kernel.org/stable/c/12c064bcfa56e3631be9f5336ee113b7f849959a
• https://git.kernel.org/stable/c/19cca7c36055906b3cff3e297618ee8a50cde25d
• https://git.kernel.org/stable/c/387b1baefbb776e3f48dc2261e77a49213f470f7
• https://git.kernel.org/stable/c/671b7b9a660ef15b25faa3df161205b9dc8d1eb2
• https://git.kernel.org/stable/c/a0cd9e22f8faed30a8da8be357c51bd8b3074ee9

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories