CVE-2026-98631
Last modified
CVE-2026-98631 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: xsk: Use a 32-bit compare in xsk_map_gen_lookup xsk_map_gen_lookup() loads a u32 key and compares it with max_entries using BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a max_entries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key.
Description
In the Linux kernel, the following vulnerability has been resolved: xsk: Use a 32-bit compare in xsk_map_gen_lookup xsk_map_gen_lookup() loads a u32 key and compares it with max_entries using BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a max_entries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key. An out-of-range index then skips the bounds check and the generated lookup reads past xsk_map[]. Compare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e65650f291ee72fc578d6346080fc4699204ef2c, < c6d5c582d55a8f229d75e98d62eaa065b0deb18d; >= e65650f291ee72fc578d6346080fc4699204ef2c, < 227ec890559e922e235eb543646e3bf0bd8269b0; >= e65650f291ee72fc578d6346080fc4699204ef2c, < 11d9be35c1f4233798e99be98bc474f83a254c6c; >= e65650f291ee72fc578d6346080fc4699204ef2c, < 123f90f394ca404ab8796a7c8072ff7fa5b65a9c; >= e65650f291ee72fc578d6346080fc4699204ef2c, < 36461e58f88a1b723f86693f437ac12e60ff4363; >= e65650f291ee72fc578d6346080fc4699204ef2c, < b5c0cff0c5331582ab01c4c423731453a8381acc; >= e65650f291ee72fc578d6346080fc4699204ef2c, < 3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24; >= e65650f291ee72fc578d6346080fc4699204ef2c, < 70504de0bb627848667207bec7ccfd647deb8814 |
| Linux | Linux | 5.5 |
References
Timeline
- Published
- Last Modified
- Status
- Received
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