CVE-2026-64304
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.17%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.17% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82Patch
- https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91Patch
- https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844Patch
- https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202bPatch
- https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1aPatch
- https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5Patch
- https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481Patch
- https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.