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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 kernel-livepatch-5.10.93-87.444Upgrade kernel-tools-develUpgrade perfUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-livepatch-4.14.262-200.489Upgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-toolsUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf | 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-64kb-optionalUpgrade reiserfs-kmp-azureUpgrade reiserfs-kmp-defaultUpgrade kernel-default-develUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-rt-develUpgrade kselftests-kmp-64kbUpgrade reiserfs-kmp-rtUpgrade kernel-default-baseUpgrade kernel-debug-develUpgrade kernel-preempt-develUpgrade kernel-rt-livepatchUpgrade kernel-64kb-livepatch-develUpgrade kernel-default-vdsoUpgrade kernel-develUpgrade ocfs2-kmp-azureUpgrade gfs2-kmp-64kbUpgrade dtb-appleUpgrade dtb-caviumUpgrade kernel-symsUpgrade kselftests-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade dtb-amazonUpgrade gfs2-kmp-defaultUpgrade dtb-mediatekUpgrade cluster-md-kmp-rtUpgrade dtb-renesasUpgrade dtb-xilinxUpgrade kernel-64kb-develUpgrade kernel-default-livepatch-develUpgrade dtb-allwinnerUpgrade kernel-debugUpgrade kernel-64kb-extraUpgrade dtb-alteraUpgrade dtb-hisiliconUpgrade dlm-kmp-64kbUpgrade gfs2-kmp-azureUpgrade dtb-amdUpgrade kernel-defaultUpgrade kernel-rt_debug-livepatch-develUpgrade dlm-kmp-rtUpgrade kernel-azure-optionalUpgrade kernel-default-optionalUpgrade dtb-armUpgrade kernel-devel-rtUpgrade cluster-md-kmp-64kbUpgrade dtb-sprdUpgrade ocfs2-kmp-rtUpgrade kernel-zfcpdumpUpgrade kernel-64kbUpgrade kernel-rt_debugUpgrade kernel-docs-htmlUpgrade kernel-azure-develUpgrade kernel-rt_debug-develUpgrade kernel-rt-extraUpgrade kernel-azure-baseUpgrade kernel-rt_debug-vdsoUpgrade cluster-md-kmp-azureUpgrade kernel-devel-azureUpgrade kernel-debug-livepatch-develUpgrade kernel-macrosUpgrade dtb-socionextUpgrade kernel-azure-livepatch-develUpgrade dtb-freescaleUpgrade kernel-default-extraUpgrade gfs2-kmp-rtUpgrade kselftests-kmp-azureUpgrade kernel-source-azureUpgrade kernel-preemptUpgrade dtb-marvellUpgrade kernel-kvmsmallUpgrade dlm-kmp-azureUpgrade dtb-apmUpgrade reiserfs-kmp-64kbUpgrade kernel-syms-rtUpgrade kernel-source-vanillaUpgrade kernel-rtUpgrade kernel-kvmsmall-develUpgrade kernel-source-rtUpgrade dtb-broadcomUpgrade kernel-default-livepatchUpgrade kernel-syms-azureUpgrade kernel-docsUpgrade dtb-nvidiaUpgrade dtb-lgUpgrade dlm-kmp-defaultUpgrade kernel-azureUpgrade kernel-sourceUpgrade kernel-rt-optionalUpgrade kernel-rt-vdsoUpgrade kernel-default-manUpgrade dtb-rockchipUpgrade dtb-qcomUpgrade kernel-azure-vdsoUpgrade dtb-amlogicUpgrade kselftests-kmp-defaultUpgrade kernel-default-base-rebuildUpgrade ocfs2-kmp-64kbUpgrade dtb-exynosUpgrade kernel-kvmsmall-vdsoUpgrade kernel-obs-qaUpgrade cluster-md-kmp-defaultUpgrade kernel-obs-buildUpgrade kernel-azure-extraUpgrade kernel-rt-livepatch-develUpgrade kernel-debug-vdso | Aug 9, 2024 | May 24, 2024 |
| Ubuntu | — | Upgrade linux-image-lowlatencyUpgrade linux-image-4.4.0-268-lowlatencyUpgrade linux-image-4.4.0-1181-awsUpgrade linux-image-4.4.0-1144-kvmUpgrade linux-image-genericUpgrade linux-image-kvmUpgrade linux-image-4.4.0-1113-fipsUpgrade linux-image-virtualUpgrade linux-image-lowlatency-lts-xenialUpgrade linux-image-4.4.0-268-genericUpgrade linux-image-awsUpgrade linux-image-generic-lts-xenialUpgrade linux-image-fipsUpgrade linux-image-4.4.0-1143-awsUpgrade linux-image-virtual-lts-xenial | 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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