CVE-2026-74720 PUBLISHED

bpf: Preserve pointer state for commuted arithmetic

Assigner: Linux
Reserved: 15.08.2026 Published: 22.08.2026 Updated: 22.08.2026

In the Linux kernel, the following vulnerability has been resolved:

bpf: Preserve pointer state for commuted arithmetic

When scalar += pointer is handled in adjust_ptr_min_max_vals(), the destination register inherits the pointer state from the source pointer. Copying only selected fields is fragile because pointer provenance is tracked by several bpf_reg_state fields.

Use the caller's temporary offset register to preserve the scalar operand while replacing the destination with the full pointer state. This preserves the frame number for PTR_TO_STACK registers and keeps parent identity fields consistent.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to 86b203aadc2930e0a4f9c6277b5b80ff3664c472 (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to 8109c25e0c41f5f19a1c2380bb49c991a877494e (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to d1959028190a7649b926f5867a58de5fe221b23c (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to 8cb23101a3fcc7432b451ea3d0f14a90711f4acf (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to 29c239f8dbec5ab33a61796724d189bddee6cd4b (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to db6382ed3361bdd8129572a3423956cba1dae829 (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to eaffa1495e4fe6330aeff9f323ea3d48b01f118a (excl.)
  • affected from f4d7e40a5b7157e1329c3c5b10f60d8289fc2941 to a4c6f804b44c5c790269b25e0e61cf4e9f117c86 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 4.16 is affected
  • unaffected from 0 to 4.16 (excl.)
  • unaffected from 5.10.265 to 5.10.* (incl.)
  • unaffected from 5.15.216 to 5.15.* (incl.)
  • unaffected from 6.1.183 to 6.1.* (incl.)
  • unaffected from 6.6.152 to 6.6.* (incl.)
  • unaffected from 6.12.104 to 6.12.* (incl.)
  • unaffected from 6.18.45 to 6.18.* (incl.)
  • unaffected from 7.1.9 to 7.1.* (incl.)
  • unaffected from 7.2 to * (incl.)

References