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In the Linux kernel, the following vulnerability has been resolved:
9p: add missing locking around taking dentry fid list
Fix a use-after-free on dentry's d_fsdata fid list when a thread looks up a fid through dentry while another thread unlinks it:
UAF thread: refcount_t: addition on 0; use-after-free. p9_fid_get linux/./include/net/9p/client.h:262 v9fs_fid_find+0x236/0x280 linux/fs/9p/fid.c:129 v9fs_fid_lookup_with_uid linux/fs/9p/fid.c:181 v9fs_fid_lookup+0xbf/0xc20 linux/fs/9p/fid.c:314 v9fs_vfs_getattr_dotl+0xf9/0x360 linux/fs/9p/vfs_inode_dotl.c:400 vfs_statx+0xdd/0x4d0 linux/fs/stat.c:248
Freed by: p9_fid_destroy (inlined) p9_client_clunk+0xb0/0xe0 linux/net/9p/client.c:1456 p9_fid_put linux/./include/net/9p/client.h:278 v9fs_dentry_release+0xb5/0x140 linux/fs/9p/vfs_dentry.c:55 v9fs_remove+0x38f/0x620 linux/fs/9p/vfs_inode.c:518 vfs_unlink+0x29a/0x810 linux/fs/namei.c:4335
The problem is that d_fsdata was not accessed under d_lock, because d_release() normally is only called once the dentry is otherwise no longer accessible but since we also call it explicitly in v9fs_remove that lock is required: move the hlist out of the dentry under lock then unref its fids once they are no longer accessible.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | Jun 25, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 25, 2024 |
| Suse | — | Upgrade kernel-kvmsmall-develUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-default-baseUpgrade kernel-default-optionalUpgrade kernel-docs-htmlUpgrade kernel-rt_debugUpgrade dtb-marvellUpgrade dtb-mediatekUpgrade kernel-develUpgrade dlm-kmp-defaultUpgrade gfs2-kmp-azureUpgrade dtb-allwinnerUpgrade kselftests-kmp-defaultUpgrade kernel-symsUpgrade kernel-docsUpgrade cluster-md-kmp-azureUpgrade dtb-socionextUpgrade kselftests-kmp-rtUpgrade kernel-devel-rtUpgrade dtb-appleUpgrade kernel-azure-optionalUpgrade gfs2-kmp-64kbUpgrade ocfs2-kmp-defaultUpgrade kernel-debug-develUpgrade dlm-kmp-azureUpgrade dtb-amazonUpgrade kernel-64kb-extraUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-apmUpgrade kernel-debugUpgrade kernel-64kb-develUpgrade kernel-default-develUpgrade ocfs2-kmp-64kbUpgrade kernel-default-livepatchUpgrade dtb-lgUpgrade dtb-xilinxUpgrade reiserfs-kmp-rtUpgrade kernel-rt-develUpgrade kernel-64kbUpgrade cluster-md-kmp-rtUpgrade dtb-renesasUpgrade dtb-freescaleUpgrade ocfs2-kmp-azureUpgrade dtb-hisiliconUpgrade kernel-azure-extraUpgrade kernel-zfcpdumpUpgrade gfs2-kmp-defaultUpgrade kernel-64kb-livepatch-develUpgrade dtb-caviumUpgrade kernel-default-livepatch-develUpgrade kernel-64kb-optionalUpgrade dtb-broadcomUpgrade kernel-source-azureUpgrade reiserfs-kmp-defaultUpgrade ocfs2-kmp-rtUpgrade dtb-amdUpgrade kernel-azure-vdsoUpgrade kernel-rtUpgrade kernel-kvmsmall-vdsoUpgrade dtb-exynosUpgrade kernel-obs-qaUpgrade dtb-nvidiaUpgrade kernel-azureUpgrade kernel-syms-azureUpgrade kernel-rt-livepatch-develUpgrade kernel-azure-livepatch-develUpgrade dtb-sprdUpgrade dtb-qcomUpgrade dlm-kmp-64kbUpgrade reiserfs-kmp-azureUpgrade kernel-rt_debug-vdsoUpgrade kernel-rt_debug-develUpgrade kernel-azure-develUpgrade dtb-alteraUpgrade dlm-kmp-rtUpgrade kselftests-kmp-azureUpgrade kernel-rt-optionalUpgrade kernel-debug-vdsoUpgrade dtb-rockchipUpgrade cluster-md-kmp-64kbUpgrade dtb-armUpgrade kernel-default-extraUpgrade gfs2-kmp-rtUpgrade kernel-syms-rtUpgrade kernel-rt-livepatchUpgrade reiserfs-kmp-64kbUpgrade kernel-source-rtUpgrade kernel-rt-extraUpgrade kernel-default-vdsoUpgrade kernel-default-base-rebuildUpgrade kernel-debug-livepatch-develUpgrade kernel-defaultUpgrade kernel-source-vanillaUpgrade kernel-rt-vdsoUpgrade cluster-md-kmp-defaultUpgrade kernel-obs-buildUpgrade dtb-amlogicUpgrade kselftests-kmp-64kbUpgrade kernel-devel-azureUpgrade kernel-sourceUpgrade kernel-macrosUpgrade kernel-kvmsmall | Jul 23, 2024 | Jun 25, 2024 |
| Ubuntu | — | Upgrade linux-image-virtual-hwe-22.04Upgrade linux-image-6.8.0-44-generic-64kUpgrade linux-image-gkeop-5.15Upgrade linux-image-5.15.0-1078-azureUpgrade linux-image-oem-22.04dUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-6.8.0-1011-raspiUpgrade linux-image-6.8.0-1013-nvidia-lowlatencyUpgrade linux-image-generic-hwe-22.04Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-5.15.0-1068-nvidiaUpgrade linux-image-6.8.0-1014-azure-fdeUpgrade linux-image-5.15.0-127-generic-64kUpgrade linux-image-oem-22.04cUpgrade linux-image-5.15.0-127-genericUpgrade linux-image-gcpUpgrade linux-image-raspiUpgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-1013-nvidia-64kUpgrade linux-image-awsUpgrade linux-image-azureUpgrade linux-image-kvmUpgrade linux-image-oem-20.04dUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-5.15.0-127-lowlatency-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-oem-22.04bUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1014-gcpUpgrade linux-image-azure-fdeUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-azure-cvmUpgrade linux-image-oem-20.04cUpgrade linux-image-5.15.0-1066-raspiUpgrade linux-image-5.15.0-127-lowlatencyUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-5.15.0-1070-kvmUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-5.15.0-1071-oracleUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-5.15.0-1072-gcpUpgrade linux-image-6.8.0-45-generic-64kUpgrade linux-image-6.8.0-44-lowlatency-64kUpgrade linux-image-raspi-nolpaeUpgrade linux-image-5.15.0-1066-ibmUpgrade linux-image-intelUpgrade linux-image-6.8.0-44-lowlatencyUpgrade linux-image-5.15.0-1073-awsUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-oem-22.04aUpgrade linux-image-aws-lts-22.04Upgrade linux-image-6.8.0-1010-gkeUpgrade linux-image-lowlatencyUpgrade linux-image-5.15.0-1039-xilinx-zynqmpUpgrade linux-image-virtualUpgrade linux-image-gke-5.15Upgrade linux-image-gkeUpgrade linux-image-6.8.0-1012-ibmUpgrade linux-image-gkeopUpgrade linux-image-5.15.0-1068-nvidia-lowlatencyUpgrade linux-image-oem-20.04bUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-44-genericUpgrade linux-image-6.8.0-45-genericUpgrade linux-image-5.15.0-127-generic-lpaeUpgrade linux-image-intel-iotgUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-5.15.0-1056-gkeopUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-5.15.0-1071-intel-iotgUpgrade linux-image-6.8.0-1013-nvidiaUpgrade linux-image-5.15.0-1070-gkeUpgrade linux-image-ibm-classicUpgrade linux-image-nvidiaUpgrade linux-image-generic-64kUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-6.8.0-1015-awsUpgrade linux-image-6.8.0-1012-oracle-64kUpgrade linux-image-azure-lts-22.04Upgrade linux-image-oem-20.04Upgrade linux-image-generic-lpaeUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-1012-oracleUpgrade linux-image-genericUpgrade linux-image-6.8.0-1014-azureUpgrade linux-image-6.8.0-1013-nvidia-lowlatency-64kUpgrade linux-image-ibmUpgrade linux-image-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1012-oemUpgrade linux-image-oracle | Sep 12, 2024 | Jun 25, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 14, 2025 | Jun 25, 2024 |
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