CVSS 7.8 · High EPSS 0,78%
Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 "nfsd: grant read delegations to clients holding writes" made this bug easier to hit, but I looked as far back as v3.0 and it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have been there from the beginning.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Semua versi sebelum 4.4.296 |
| linux | linux kernel | Versi 4.5 hingga sebelum 4.9.294 |
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| linux | linux kernel | Versi 4.15 hingga sebelum 4.19.222 |
| linux | linux kernel | Versi 4.20 hingga sebelum 5.4.168 |
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| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.8 |
| linux | linux kernel | Versi 5.15 rc1 |
| linux | linux kernel | Versi 5.15 rc2 |
| linux | linux kernel | Versi 5.15 rc3 |
| linux | linux kernel | Versi 5.15 rc4 |