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CVE-2025-39759— btrfs: qgroup: fix race between quota disable and quota rescan ioctl

EPSS 0.01% · P3

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinuxe685da14af6b31e4b336a110cb1bae1afc268be8< 7cda0fdde5d9890976861421d207870500f9aaceaffected
e685da14af6b31e4b336a110cb1bae1afc268be8< b172535ccba12f0cf7d23b3b840989de47fc104daffected
e685da14af6b31e4b336a110cb1bae1afc268be8< dd0b28d877b293b1d7f8727a7de08ae36b6b9ef0affected
e685da14af6b31e4b336a110cb1bae1afc268be8< c38028ce0d0045ca600b6a8345a0ff92bfb47b66affected
e685da14af6b31e4b336a110cb1bae1afc268be8< 2fd0f5ceb997f90f4332ccbab6c7e907e6b2d0ebaffected
e685da14af6b31e4b336a110cb1bae1afc268be8< e1249667750399a48cafcf5945761d39fa584edfaffected
3.12affected
< 3.12unaffected
… +6 more rows
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I. Basic Information for CVE-2025-39759

Vulnerability Information
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Vulnerability Title
btrfs: qgroup: fix race between quota disable and quota rescan ioctl
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: qgroup: fix race between quota disable and quota rescan ioctl There's a race between a task disabling quotas and another running the rescan ioctl that can result in a use-after-free of qgroup records from the fs_info->qgroup_tree rbtree. This happens as follows: 1) Task A enters btrfs_ioctl_quota_rescan() -> btrfs_qgroup_rescan(); 2) Task B enters btrfs_quota_disable() and calls btrfs_qgroup_wait_for_completion(), which does nothing because at that point fs_info->qgroup_rescan_running is false (it wasn't set yet by task A); 3) Task B calls btrfs_free_qgroup_config() which starts freeing qgroups from fs_info->qgroup_tree without taking the lock fs_info->qgroup_lock; 4) Task A enters qgroup_rescan_zero_tracking() which starts iterating the fs_info->qgroup_tree tree while holding fs_info->qgroup_lock, but task B is freeing qgroup records from that tree without holding the lock, resulting in a use-after-free. Fix this by taking fs_info->qgroup_lock at btrfs_free_qgroup_config(). Also at btrfs_qgroup_rescan() don't start the rescan worker if quotas were already disabled.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于配额禁用和配额重新扫描ioctl之间存在竞争条件，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux e685da14af6b31e4b336a110cb1bae1afc268be8 ~ 7cda0fdde5d9890976861421d207870500f9aace -
LinuxLinux 3.12 -

II. Public POCs for CVE-2025-39759

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III. Intelligence Information for CVE-2025-39759

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Same Patch Batch · Linux · 2025-09-11 · 54 CVEs total

CVE-2025-39774iio: adc: rzg2l_adc: Set driver data before enabling runtime PM
CVE-2025-39791dm: dm-crypt: Do not partially accept write BIOs with zoned targets
CVE-2025-39785drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local
CVE-2025-39788scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE
CVE-2025-39787soc: qcom: mdt_loader: Ensure we don't read past the ELF header
CVE-2025-39786iio: adc: ad7173: fix channels index for syscalib_mode
CVE-2025-39789crypto: x86/aegis - Add missing error checks
CVE-2025-39777crypto: acomp - Fix CFI failure due to type punning
CVE-2025-39776mm/debug_vm_pgtable: clear page table entries at destroy_args()
CVE-2025-39775mm/mremap: fix WARN with uffd that has remap events disabled
CVE-2025-39779btrfs: subpage: keep TOWRITE tag until folio is cleaned
CVE-2025-39773net: bridge: fix soft lockup in br_multicast_query_expired()
CVE-2025-39772drm/hisilicon/hibmc: fix the hibmc loaded failed bug
CVE-2025-39771regulator: pca9450: Use devm_register_sys_off_handler
CVE-2025-39770net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM
CVE-2025-39769bnxt_en: Fix lockdep warning during rmmod
CVE-2025-39768net/mlx5: HWS, fix complex rules rehash error flow
CVE-2025-39766net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit
CVE-2025-39767LoongArch: Optimize module load time by optimizing PLT/GOT counting
CVE-2025-39765ALSA: timer: fix ida_free call while not allocated

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39759

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