Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix OOB in pcpu_init_value An out-of-bounds read occurs when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the same value_size that is not rounded up to 8 bytes. The issue happens when: 1. A CGROUP_STORAGE map is created with value_size not aligned to 8 bytes (e.g., 4 bytes) 2. A pcpu map is created with the same value_size (e.g., 4 bytes) 3. Update element in 2 with data in 1 pcpu_init_value assumes that all sources are rounded up to 8 bytes, and invokes copy_map_value_long to make a data copy, However, the assumption doesn't stand since there are some cases where the source may not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data. the verifier verifies exactly the size that the source claims, not the size rounded up to 8 bytes by kernel, an OOB happens when the source has only 4 bytes while the copy size(4) is rounded up to 8.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before e19c5ed9f1922a6854073f8651a63fa7be26e9e9; affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before e0378419b0e20178b5d100b27c9cc7e51064202e; affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before 6086079e6d1c32ba4c4b422612b8aebb1129a96c; affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before 634a793d0e1c822412095d25a1338f8831ad894c; affected d3bec0138bfbe58606fc1d6f57a4cdc1a20218db before 576afddfee8d1108ee299bf10f581593540d1a36; affected c602ad2b52dcbca5af08e5137bd5575c039b52e3; affected ab68b940dd6f7b5f8e2557937162dcb8a0583a05; affected 5.4.78 before 5.5; affected 5.9.9 before 5.10 |
| Linux / Linux | affected 5.10; unaffected 0 before 5.10; unaffected 6.6.141 through 6.6.*; unaffected 6.12.91 through 6.12.*; unaffected 6.18.33 through 6.18.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9
- https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e
- https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c
- https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c
- https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36
ADP enrichment
No English description supplied.
No references supplied.