Description
In the Linux kernel, the following vulnerability has been resolved: crypto: jitterentropy - replace long-held spinlock with mutex jent_kcapi_random() serializes the shared jitterentropy state, but it currently holds a spinlock across the jent_read_entropy() call. That path performs expensive jitter collection and SHA3 conditioning, so parallel readers can trigger stalls as contending waiters spin for the same lock. To prevent non-preemptible lock hold, replace rng->jent_lock with a mutex so contended readers sleep instead of spinning on a shared lock held across expensive entropy generation.
Affected products
- Linux / Linuxbb5530e4082446aac3a3d69780cd4dbfa4520013 – 18216b8ab6904753eaf31baf453cb02ecd202ba4
- Linux / Linuxbb5530e4082446aac3a3d69780cd4dbfa4520013 – 4c03e6eb98443dc4d6d422a9780034a5b75376b4
- Linux / Linuxbb5530e4082446aac3a3d69780cd4dbfa4520013 – ff734dbd9e2432601a6dcd167cfb0bf8a36d1880
- Linux / Linuxbb5530e4082446aac3a3d69780cd4dbfa4520013 – ec427dc5286da1ed08f2d510e2147a7581b0cb02
- Linux / Linuxbb5530e4082446aac3a3d69780cd4dbfa4520013 – 01d798e9feb30212952d4e992801ba6bd6a82351
- Linux / Linux4.2 – 4.2
- Linux / Linux0 – 4.2
- Linux / Linux6.6.141 – 6.6.*
- Linux / Linux6.12.91 – 6.12.*
- Linux / Linux6.18.33 – 6.18.*
- Linux / Linux7.0.10 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/18216b8ab6904753eaf31baf453cb02ecd202ba4
- MISChttps://git.kernel.org/stable/c/4c03e6eb98443dc4d6d422a9780034a5b75376b4
- MISChttps://git.kernel.org/stable/c/ff734dbd9e2432601a6dcd167cfb0bf8a36d1880
- MISChttps://git.kernel.org/stable/c/ec427dc5286da1ed08f2d510e2147a7581b0cb02
- MISChttps://git.kernel.org/stable/c/01d798e9feb30212952d4e992801ba6bd6a82351