CVE-2026-72426
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Preserve pointer spill metadata during half-slot cleanup
__clean_func_state() cleans dead stack slots in 4-byte halves. When the high half of a STACK_SPILL slot is dead and the low half remains live, cleanup converts the live low half to STACK_MISC or STACK_ZERO and clears the saved spilled_ptr metadata.
That conversion is safe only for scalar spills. For a pointer spill, this metadata clear lets a later 32-bit fill from the still-live half avoid the normal non-scalar register-fill check and be treated as an ordinary scalar stack read.
Leave non-scalar spill slots intact in this half-live shape. This is conservative for pruning and preserves the existing check_stack_read_fixed_off() rejection path for partial fills from pointer spills.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | be23266b4a08540aa43d8503a2ea10247c8daebe < 0f9278b22cda6fd2525049930157b79b4036b4ef | affected |
| Linux | Linux | be23266b4a08540aa43d8503a2ea10247c8daebe < 3a354149bceacadbcf7d7b4766f5ef26a85892ab | affected |
| Linux | Linux | 7.1 | affected |
| Linux | Linux | 0 < 7.1 | unaffected |
| Linux | Linux | 7.1.5 <= 7.1.* | unaffected |
| Linux | Linux | 7.2 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/0f9278b22cda6fd2525049930157b79b4036b4ef
- https://git.kernel.org/stable/c/3a354149bceacadbcf7d7b4766f5ef26a85892ab
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