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.
Update Linux/Linux to 04a8d07f3d58308b92630045560799a3faa3ebce if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scannfsd: fix use-after-free due to delegation race affects Linux/Linux (generic), Linux/Linux (generic). Severity is critical. 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.
AI coding agents often install or upgrade packages automatically in generic. A critical vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range |
|---|
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.
Update Linux/Linux to 04a8d07f3d58308b92630045560799a3faa3ebce if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scannfsd: fix use-after-free due to delegation race affects Linux/Linux (generic), Linux/Linux (generic). Severity is critical. 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.
AI coding agents often install or upgrade packages automatically in generic. A critical vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range |
|---|
| Fixed version |
|---|
| Linux/Linuxgeneric | >=dff1399f8addf7129c49bb2227469da79cc30b47 <04a8d07f3d58308b92630045560799a3faa3ebce || >=dff1399f8addf7129c49bb2227469da79cc30b47 <348714018139c39533c55661a0c7c990671396b4 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <33645d3e22720cac1e4548f8fef57bf0649536ee || >=dff1399f8addf7129c49bb2227469da79cc30b47 <2becaa990b93cbd2928292c0b669d3abb6cf06d4 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <e0759696de6851d7536efddfdd2dfed4c4df1f09 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <eeb0711801f5e19ef654371b627682aed3b11373 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <148c816f10fd11df27ca6a9b3238cdd42fa72cd3 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <548ec0805c399c65ed66c6641be467f717833ab5 | 04a8d07f3d58308b92630045560799a3faa3ebce, 348714018139c39533c55661a0c7c990671396b4, 33645d3e22720cac1e4548f8fef57bf0649536ee, 2becaa990b93cbd2928292c0b669d3abb6cf06d4, e0759696de6851d7536efddfdd2dfed4c4df1f09, eeb0711801f5e19ef654371b627682aed3b11373, 148c816f10fd11df27ca6a9b3238cdd42fa72cd3, 548ec0805c399c65ed66c6641be467f717833ab5 |
|---|---|---|
| Linux/Linuxgeneric | 3.17 | Not reported |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by CVE List V5 (cvelist).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard| Fixed version |
|---|
| Linux/Linuxgeneric | >=dff1399f8addf7129c49bb2227469da79cc30b47 <04a8d07f3d58308b92630045560799a3faa3ebce || >=dff1399f8addf7129c49bb2227469da79cc30b47 <348714018139c39533c55661a0c7c990671396b4 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <33645d3e22720cac1e4548f8fef57bf0649536ee || >=dff1399f8addf7129c49bb2227469da79cc30b47 <2becaa990b93cbd2928292c0b669d3abb6cf06d4 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <e0759696de6851d7536efddfdd2dfed4c4df1f09 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <eeb0711801f5e19ef654371b627682aed3b11373 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <148c816f10fd11df27ca6a9b3238cdd42fa72cd3 || >=dff1399f8addf7129c49bb2227469da79cc30b47 <548ec0805c399c65ed66c6641be467f717833ab5 | 04a8d07f3d58308b92630045560799a3faa3ebce, 348714018139c39533c55661a0c7c990671396b4, 33645d3e22720cac1e4548f8fef57bf0649536ee, 2becaa990b93cbd2928292c0b669d3abb6cf06d4, e0759696de6851d7536efddfdd2dfed4c4df1f09, eeb0711801f5e19ef654371b627682aed3b11373, 148c816f10fd11df27ca6a9b3238cdd42fa72cd3, 548ec0805c399c65ed66c6641be467f717833ab5 |
|---|---|---|
| Linux/Linuxgeneric | 3.17 | Not reported |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by CVE List V5 (cvelist).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard