Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: validate offshift to prevent shift-out-of-bounds u32_change() copies the user-provided tc_u32_sel.offshift (unsigned char, 0-255) into the kernel knode object without bounds validation. When a packet later hits u32_classify() with TC_U32_VAROFFSET set, it evaluates `ntohs(offmask & *data) >> offshift` where the left operand is a 16-bit value promoted to a 32-bit int. Any offshift >= 32 is undefined behavior per C11 6.5.7p3, triggerable by an unprivileged user via user/network namespaces. UBSAN: shift-out-of-bounds in net/sched/cls_u32.c:236:43 shift exponent 32 is too large for 32-bit type int Fix this by rejecting offshift >= 16 during filter creation in u32_change().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 724c8edbacf1259988829cb9967f751222121d8a; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 006a4598da9a6b02e0ddc3ca5042b97224774364; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9990cac513e8b191de2ee589051ea7ebf3cee940; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 313cb9ffc4101a885d791facf4b5ea3d5e06144d; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before aef96eead2860cbfa371e4471d4f04412213b958 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/724c8edbacf1259988829cb9967f751222121d8a
- https://git.kernel.org/stable/c/006a4598da9a6b02e0ddc3ca5042b97224774364
- https://git.kernel.org/stable/c/9990cac513e8b191de2ee589051ea7ebf3cee940
- https://git.kernel.org/stable/c/313cb9ffc4101a885d791facf4b5ea3d5e06144d
- https://git.kernel.org/stable/c/aef96eead2860cbfa371e4471d4f04412213b958
ADP enrichment
No English description supplied.
No references supplied.