CVE-2026-64304: linux Out-of-bounds Write
Vulnerability summary
CVE-2026-64304 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 45 · Related 38Timeline
- 25-07-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component lengths The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt() allocates half-size DMA buffers (key_sz / 2) and right-aligns each component with: memcpy(dst + half_key_sz - len, src, len) When a CRT component is larger than half_key_sz the subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption. Add a len > half_key_sz check next to the existing !len check for each of the five CRT components so the driver falls back to the non-CRT path instead of writing out of bounds.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.17%
Chance of exploitation in the next 30 days
Percentile
6%
Versus all other CVEs
30-day change
0.00 pp
From 0.17% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu168 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
- linux-6.12< 6.12.100-1~deb12u1
Linux2 products
- linux≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < 6d99c5fadd2df488103f64d6475b63ba6852202b | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < c34369473bfe92a0b46ec78d6358e30341c7f481 | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < 1002719d13072a5e4be1e993aa61dffb4a604e82 | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < 500319830d76911c120dc0b9605f8c16d7702844 | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < 3d61a214fdcda41f1ebfabbb483404032a7b4d91 | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < 6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < ce42224487c504aee4b7ff3a7342e7b4d7e28cc9 | ≥ 879f77e9071f029e1c9bd5a75814ecf51370f846, < b3ac78756588059729b9195fcc9f4b37d54057a5 | 4.8
- linux_kernel≥ 4.8, < 5.10.261 | ≥ 5.11, < 5.15.212 | ≥ 5.16, < 6.1.178 | ≥ 6.2, < 6.6.145 | ≥ 6.7, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4
3 vendors · 172 products
