Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= dff1399f8addf7129c49bb2227469da79cc30b47, < 04a8d07f3d58308b92630045560799a3faa3ebce; >= dff1399f8addf7129c49bb2227469da79cc30b47, < 348714018139c39533c55661a0c7c990671396b4; >= dff1399f8addf7129c49bb2227469da79cc30b47, < 33645d3e22720cac1e4548f8fef57bf0649536ee; >= dff1399f8addf7129c49bb2227469da79cc30b47, < 2becaa990b93cbd2928292c0b669d3abb6cf06d4; >= dff1399f8addf7129c49bb2227469da79cc30b47, < e0759696de6851d7536efddfdd2dfed4c4df1f09; >= dff1399f8addf7129c49bb2227469da79cc30b47, < eeb0711801f5e19ef654371b627682aed3b11373; >= dff1399f8addf7129c49bb2227469da79cc30b47, < 148c816f10fd11df27ca6a9b3238cdd42fa72cd3; >= dff1399f8addf7129c49bb2227469da79cc30b47, < 548ec0805c399c65ed66c6641be467f717833ab5 |
| Linux | Linux | 3.17 |
References
- https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebcePatch
- https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3Patch
- https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4Patch
- https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536eePatch
- https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4Patch
- https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5Patch
- https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09Patch
- https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373Patch
- https://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebcePatch
- https://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3Patch
- https://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4Patch
- https://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536eePatch
- https://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4Patch
- https://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5Patch
- https://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09Patch
- https://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373Patch
Timeline
- Published
- May 24, 2024
- Last modified
- Aug 4, 2026
- NVD status
- Modified