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CVE-2025-39782— jbd2: prevent softlockup in jbd2_log_do_checkpoint()

EPSS 0.01% · P1
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I. Basic Information for CVE-2025-39782

Vulnerability Information
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Vulnerability Title
jbd2: prevent softlockup in jbd2_log_do_checkpoint()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: jbd2: prevent softlockup in jbd2_log_do_checkpoint() Both jbd2_log_do_checkpoint() and jbd2_journal_shrink_checkpoint_list() periodically release j_list_lock after processing a batch of buffers to avoid long hold times on the j_list_lock. However, since both functions contend for j_list_lock, the combined time spent waiting and processing can be significant. jbd2_journal_shrink_checkpoint_list() explicitly calls cond_resched() when need_resched() is true to avoid softlockups during prolonged operations. But jbd2_log_do_checkpoint() only exits its loop when need_resched() is true, relying on potentially sleeping functions like __flush_batch() or wait_on_buffer() to trigger rescheduling. If those functions do not sleep, the kernel may hit a softlockup. watchdog: BUG: soft lockup - CPU#3 stuck for 156s! [kworker/u129:2:373] CPU: 3 PID: 373 Comm: kworker/u129:2 Kdump: loaded Not tainted 6.6.0+ #10 Hardware name: Huawei TaiShan 2280 /BC11SPCD, BIOS 1.27 06/13/2017 Workqueue: writeback wb_workfn (flush-7:2) pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : native_queued_spin_lock_slowpath+0x358/0x418 lr : jbd2_log_do_checkpoint+0x31c/0x438 [jbd2] Call trace: native_queued_spin_lock_slowpath+0x358/0x418 jbd2_log_do_checkpoint+0x31c/0x438 [jbd2] __jbd2_log_wait_for_space+0xfc/0x2f8 [jbd2] add_transaction_credits+0x3bc/0x418 [jbd2] start_this_handle+0xf8/0x560 [jbd2] jbd2__journal_start+0x118/0x228 [jbd2] __ext4_journal_start_sb+0x110/0x188 [ext4] ext4_do_writepages+0x3dc/0x740 [ext4] ext4_writepages+0xa4/0x190 [ext4] do_writepages+0x94/0x228 __writeback_single_inode+0x48/0x318 writeback_sb_inodes+0x204/0x590 __writeback_inodes_wb+0x54/0xf8 wb_writeback+0x2cc/0x3d8 wb_do_writeback+0x2e0/0x2f8 wb_workfn+0x80/0x2a8 process_one_work+0x178/0x3e8 worker_thread+0x234/0x3b8 kthread+0xf0/0x108 ret_from_fork+0x10/0x20 So explicitly call cond_resched() in jbd2_log_do_checkpoint() to avoid softlockup.
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jbd2_log_do_checkpoint函数未正确处理调度，可能导致软锁定。
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 f93ea411b73594f7d144855fd34278bcf34a9afc ~ f683d611518d30334813eecf9a8c687453e2800e -
LinuxLinux 2.6.16 -

II. Public POCs for CVE-2025-39782

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III. Intelligence Information for CVE-2025-39782

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

CVE-2025-39773net: bridge: fix soft lockup in br_multicast_query_expired()
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-2025-39776mm/debug_vm_pgtable: clear page table entries at destroy_args()
CVE-2025-39775mm/mremap: fix WARN with uffd that has remap events disabled
CVE-2025-39774iio: adc: rzg2l_adc: Set driver data before enabling runtime PM
CVE-2025-39777crypto: acomp - Fix CFI failure due to type punning
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
CVE-2025-39764netfilter: ctnetlink: remove refcounting in expectation dumpers

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39782

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