CVE-2026-93045
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject arena frees below the arena base bpf_arena_free_pages() accepts scalar arena addresses. The runtime masks the address to the low 32 bits and reconstructs a full user address from the arena base before returning the range to the arena free tree. When the scalar value is below the low 32 bits of the arena base, full_uaddr falls below user_vm_start. The existing upper-end clipping then turns this into an out-of-range free-tree offset. A later allocation can reuse that offset and return an address below the arena mapping. Reject such frees before computing the clipped range.
How to fix
- Linux Linux90453eaf8f14e7be0ab03983f2a93aeb6b990a58, a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20, 8a08635656037aee9c12231ed384449c4ffb1a93, b5a71cb2db6d84ac0042549dcec266b18429d41e or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 317460317a02a1af512697e6e964298dedd8a163 ≤ v < 90453eaf8f14e7be0ab03983f2a93aeb6b990a58, 317460317a02a1af512697e6e964298dedd8a163 ≤ v < a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20, 317460317a02a1af512697e6e964298dedd8a163 ≤ v < 8a08635656037aee9c12231ed384449c4ffb1a93, 317460317a02a1af512697e6e964298dedd8a163 ≤ v < b5a71cb2db6d84ac0042549dcec266b18429d41e, 6.9 | 90453eaf8f14e7be0ab03983f2a93aeb6b990a58, a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20, 8a08635656037aee9c12231ed384449c4ffb1a93, b5a71cb2db6d84ac0042549dcec266b18429d41e |
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