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Vulnerability · Published Jun 25, 2024 · Assigned by Linux

CVE-2024-394639p: add missing locking around taking dentry fid list

High 7.8

In plain English

A high-severity use-after-free in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 83.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.94-1DEBIAN-CVE-2024-39463
Debian:13linux6.9.7-1DEBIAN-CVE-2024-39463
Debian:14linux6.9.7-1DEBIAN-CVE-2024-39463
Ubuntu:22.04:LTSlinux5.15.0-127.137USN-7166-1
Ubuntu:22.04:LTSlinux5.15.0-127.137UBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux6.8.0-44.44UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-aws5.15.0-1073.79UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-aws5.15.0-1073.79USN-7166-2
Ubuntu:24.04:LTSlinux-aws6.8.0-1015.16UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1015.16~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure5.15.0-1078.87USN-7186-2
Ubuntu:22.04:LTSlinux-azure5.15.0-1078.87UBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-azure6.8.0-1014.16UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1014.16~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1078.87.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gcp5.15.0-1072.80USN-7166-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1072.80UBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-gcp6.8.0-1014.16UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1014.16~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gke5.15.0-1070.76UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gke5.15.0-1070.76USN-7166-1
Ubuntu:24.04:LTSlinux-gke6.8.0-1010.13UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1056.63UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1056.63USN-7166-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-45.45~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-ibm5.15.0-1066.69UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-ibm5.15.0-1066.69USN-7166-1
Ubuntu:24.04:LTSlinux-ibm6.8.0-1012.12UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1012.12~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1071.77USN-7186-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1071.77UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-kvm5.15.0-1070.75UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-kvm5.15.0-1070.75USN-7166-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-127.137UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-127.137USN-7166-1
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-44.44.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-44.44.1~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1068.69USN-7166-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1068.69UBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1013.14UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1013.14~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1013.14.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1032.32UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1020.20UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-oem-6.86.8.0-1012.12UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oracle5.15.0-1071.77USN-7166-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1071.77UBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-oracle6.8.0-1012.12UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1012.12~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-raspi5.15.0-1066.69UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-raspi5.15.0-1066.69USN-7166-1
Ubuntu:24.04:LTSlinux-raspi6.8.0-1011.12UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2024-39463
Ubuntu:24.04:LTSlinux-riscv6.8.0-44.44.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-44.44.1~22.04.1UBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2024-39463
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1039.43USN-7166-4
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1039.43UBUNTU-CVE-2024-39463

Affected products (as reported)

VendorProductVersions
Linux Linux 154372e67d4053e56591245eb413686621941333 – before 3bb6763a8319170c2d41c4232c8e7e4c37dcacfb154372e67d4053e56591245eb413686621941333 – before cb299cdba09f46f090b843d78ba26b667d50a456154372e67d4053e56591245eb413686621941333 – before f0c5c944c6d8614c19e6e9a97fd2011dcd30e8f5154372e67d4053e56591245eb413686621941333 – before fe17ebf22feb4ad7094d597526d558a49aac92b4154372e67d4053e56591245eb413686621941333 – before c898afdc15645efb555acb6d85b484eb40a45409
Linux Linux 5.11

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References