Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 37ad2bb11e9de92cb7b94548705eeedd87f7d392 before 19cca7c36055906b3cff3e297618ee8a50cde25d; affected 8674e2db06cff6b50f2216eed9a761d15425bb34 before 12c064bcfa56e3631be9f5336ee113b7f849959a; affected ce01a4e5cfac7adbe0be565f90cd32ecbb2f8337 before a0cd9e22f8faed30a8da8be357c51bd8b3074ee9; affected ee861486e377edc55361c08dcbceab3f6b6577bd before 671b7b9a660ef15b25faa3df161205b9dc8d1eb2; affected ee861486e377edc55361c08dcbceab3f6b6577bd before 387b1baefbb776e3f48dc2261e77a49213f470f7; affected 928d354ae3557e8f755a227e67be88034eb3cd7f; affected 8a800497d9f6c2ec9c2c1ba7b71d0ac2ea7f7bbe; affected de1055e7f9e67af32b1f3376066272b04e5223c0; affected d846d83bdacbd8f14fc45c63b8c1d22608452e1c; affected 6.6.148 before 6.6.160; affected 6.12.101 before 6.12.114; affected 6.18.42 before 6.18.57; affected 5.10.265 before 5.11; affected 5.15.216 before 5.16; affected 6.1.183 before 6.2; affected 7.0.10 before 7.1 |
| Linux / Linux | affected 7.1; unaffected 0 before 7.1; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/19cca7c36055906b3cff3e297618ee8a50cde25d
- https://git.kernel.org/stable/c/12c064bcfa56e3631be9f5336ee113b7f849959a
- https://git.kernel.org/stable/c/a0cd9e22f8faed30a8da8be357c51bd8b3074ee9
- https://git.kernel.org/stable/c/671b7b9a660ef15b25faa3df161205b9dc8d1eb2
- https://git.kernel.org/stable/c/387b1baefbb776e3f48dc2261e77a49213f470f7