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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade perfUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-4.14.262-200.489Upgrade kernel-livepatch-5.10.93-87.444Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-headersUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool | Feb 3, 2025 | May 24, 2024 |
| Amazon_linux | — | Upgrade kernel | Jan 31, 2025 | Feb 8, 2022 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 24, 2024 |
| Dell Powerstore Dsa2024462 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Nov 20, 2024 |
| Dell Powerstore Dsa2024497 | — | Upgrade Dell PowerStoreOS to the latest version | Jan 13, 2026 | Dec 19, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 24, 2024 |
| Suse | — | Upgrade kernel-kvmsmallUpgrade kernel-source-azureUpgrade gfs2-kmp-rtUpgrade dtb-qcomUpgrade kernel-default-extraUpgrade kselftests-kmp-azureUpgrade dtb-marvellUpgrade kernel-azureUpgrade kernel-kvmsmall-vdsoUpgrade dtb-amlogicUpgrade kernel-syms-azureUpgrade kernel-azure-extraUpgrade dtb-exynosUpgrade kernel-azure-vdsoUpgrade kernel-rt_debug-develUpgrade kernel-default-livepatchUpgrade kernel-obs-qaUpgrade dtb-rockchipUpgrade kernel-obs-buildUpgrade kernel-rt-livepatch-develUpgrade kselftests-kmp-defaultUpgrade kernel-rt-extraUpgrade dtb-broadcomUpgrade kernel-rt-vdsoUpgrade kernel-rt_debug-vdsoUpgrade dtb-socionextUpgrade kernel-sourceUpgrade kernel-debug-livepatch-develUpgrade kernel-rt_debugUpgrade kernel-devel-azureUpgrade kernel-macrosUpgrade kernel-azure-develUpgrade dlm-kmp-azureUpgrade reiserfs-kmp-64kbUpgrade kernel-syms-rtUpgrade dtb-apmUpgrade kernel-kvmsmall-develUpgrade kernel-rtUpgrade kernel-docs-htmlUpgrade kernel-azure-baseUpgrade kernel-rt-optionalUpgrade dtb-freescaleUpgrade kernel-preemptUpgrade kernel-source-rtUpgrade dtb-nvidiaUpgrade kernel-source-vanillaUpgrade kernel-docsUpgrade ocfs2-kmp-64kbUpgrade dlm-kmp-defaultUpgrade kernel-azure-livepatch-develUpgrade dtb-lgUpgrade kernel-default-base-rebuildUpgrade cluster-md-kmp-defaultUpgrade kernel-debug-vdsoUpgrade kernel-default-manUpgrade cluster-md-kmp-azureUpgrade cluster-md-kmp-64kbUpgrade dlm-kmp-64kbUpgrade dtb-hisiliconUpgrade reiserfs-kmp-azureUpgrade kselftests-kmp-64kbUpgrade kernel-rt-develUpgrade kernel-default-develUpgrade dlm-kmp-rtUpgrade gfs2-kmp-azureUpgrade kernel-64kbUpgrade dtb-armUpgrade kernel-develUpgrade ocfs2-kmp-defaultUpgrade dtb-allwinnerUpgrade kernel-symsUpgrade gfs2-kmp-defaultUpgrade dtb-appleUpgrade dtb-mediatekUpgrade dtb-caviumUpgrade kselftests-kmp-rtUpgrade dtb-amazonUpgrade dtb-alteraUpgrade dtb-amdUpgrade reiserfs-kmp-rtUpgrade cluster-md-kmp-rtUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-defaultUpgrade reiserfs-kmp-defaultUpgrade kernel-preempt-develUpgrade kernel-default-livepatch-develUpgrade dtb-renesasUpgrade kernel-64kb-optionalUpgrade gfs2-kmp-64kbUpgrade kernel-azure-optionalUpgrade kernel-64kb-develUpgrade kernel-devel-rtUpgrade kernel-default-vdsoUpgrade kernel-rt_debug-livepatch-develUpgrade ocfs2-kmp-rtUpgrade dtb-sprdUpgrade kernel-zfcpdumpUpgrade kernel-debugUpgrade ocfs2-kmp-azureUpgrade kernel-64kb-extraUpgrade kernel-default-optionalUpgrade kernel-debug-develUpgrade kernel-64kb-livepatch-develUpgrade kernel-default-baseUpgrade dtb-xilinxUpgrade kernel-rt-livepatch | Aug 9, 2024 | May 24, 2024 |
| Ubuntu | — | Upgrade linux-image-awsUpgrade linux-image-4.4.0-268-genericUpgrade linux-image-4.4.0-1143-awsUpgrade linux-image-virtual-lts-xenialUpgrade linux-image-virtualUpgrade linux-image-lowlatency-lts-xenialUpgrade linux-image-fipsUpgrade linux-image-generic-lts-xenialUpgrade linux-image-4.4.0-1181-awsUpgrade linux-image-4.4.0-1144-kvmUpgrade linux-image-4.4.0-268-lowlatencyUpgrade linux-image-kvmUpgrade linux-image-lowlatencyUpgrade linux-image-genericUpgrade linux-image-4.4.0-1113-fips | Nov 19, 2024 | May 24, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 24, 2024 |
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