CVE-2026-64018: linux Improper Validation of Array Index
Vulnerability summary
CVE-2026-64018 is a critical (CVSS 9.3) Improper Validation of Array Index vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 52 · Related 48Timeline
- 19-07-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: net: mana: validate rx_req_idx to prevent out-of-bounds array access In mana_hwc_rx_event_handler(), rx_req_idx is derived from sge->address in DMA-coherent memory. In Confidential VMs (SEV-SNP/TDX), this memory is shared unencrypted and HW can modify WQE contents at any time. No bounds check exists on rx_req_idx, which can lead to an out-of-bounds access into reqs[]. Add bounds check on rx_req_idx in mana_hwc_rx_event_handler() before using it to index the reqs[] array.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.3CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- NVDNIST9.3CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.14%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
0.00 pp
From 0.14% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-129Improper Validation of Array IndexThe product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.
- CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.
Affected systems
Ubuntu155 products
- linux< 5.15.0-186.196 | < 6.8.0-139.139 | < 7.0.0-28.28
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1112.119 | < 6.8.0-1064.67 | < 7.0.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < 5ddc715324badd7f2641bc177db1d027b402adae | ≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < ff1d5af207bcea857d45fe81505f1bc4b29eaef0 | ≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < 01f7f893d5e1baae995beeb86cd0f3e6bb2a3b01 | ≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < 763a372d344fb12fae566d36ddb46e92454ad58c | ≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < fa627a5eaa83fc0261f44ef3769693b886ca6e27 | ≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < 355e9f2b2a7887ca38100127989af3e422ba71d0 | ≥ ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f, < b809d0409991b75a6cff846a5ac27c3062953f84 | 5.13
- linux_kernel≥ 5.13, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4
Debian1 product
- linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
3 vendors · 158 products
