CVE-2026-98631
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- CVE-2026-98631
CVE Details
| Release Date: | 2026-10-18 | |
| Impact: | Important | What is this? |
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.
See more information about CVE-2026-98631 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 metrics
| Base Score: | 1.9 |
| Vector String: | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N |
| Version: | 3.1 |
| Attack Vector: | Local |
| Attack Complexity: | High |
| Privileges Required: | High |
| User Interaction: | None |
| Scope: | Unchanged |
| Confidentiality Impact: | Low |
| Integrity Impact: | None |
| Availability Impact: | None |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 10 (kernel-uek) | ELSA-2026-500572 | 2026-11-02 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2026-500574 | 2026-11-02 |
| Oracle Linux version 9 (kernel-uek) | ELSA-2026-500572 | 2026-11-02 |
| Oracle Linux version 9 (kernel-uek) | ELSA-2026-500574 | 2026-11-02 |
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