Medium 5.5Published Sep 11, 2025

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

Updated under an hour ago (Oct 28, 2026, 6:40 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f93ea411b73594f7d144855fd34278bcf34a9afc before f683d611518d30334813eecf9a8c687453e2800e; from f93ea411b73594f7d144855fd34278bcf34a9afc before f7ee8fd689e6d534f9fd2494b9266f7998082e65; from f93ea411b73594f7d144855fd34278bcf34a9afc before 84ff98c1ea19acd3f9389e4bb6061364e943f85e; from f93ea411b73594f7d144855fd34278bcf34a9afc before 26cb9aad94cb1811d8fae115594cc71fa3d91ab0; from f93ea411b73594f7d144855fd34278bcf34a9afc before 41f40038de62e8306897cf6840791b268996432a; from f93ea411b73594f7d144855fd34278bcf34a9afc before 429d50cbaff45090d52a1ea850d5de8c14881ee7; from f93ea411b73594f7d144855fd34278bcf34a9afc before 3faac5e1d14c63260fd1bf789d96bde3ab3d9e54; from f93ea411b73594f7d144855fd34278bcf34a9afc before 9d98cf4632258720f18265a058e62fde120c0151	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.16 before 5.4.297; from 5.5 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4; 6.17; and 1 more ranges	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/f683d611518d30334813eecf9a8c687453e2800e	patch
https://git.kernel.org/stable/c/f7ee8fd689e6d534f9fd2494b9266f7998082e65	patch
https://git.kernel.org/stable/c/84ff98c1ea19acd3f9389e4bb6061364e943f85e	patch
https://git.kernel.org/stable/c/26cb9aad94cb1811d8fae115594cc71fa3d91ab0	patch
https://git.kernel.org/stable/c/41f40038de62e8306897cf6840791b268996432a	patch
https://git.kernel.org/stable/c/429d50cbaff45090d52a1ea850d5de8c14881ee7	patch
https://git.kernel.org/stable/c/3faac5e1d14c63260fd1bf789d96bde3ab3d9e54	patch
https://git.kernel.org/stable/c/9d98cf4632258720f18265a058e62fde120c0151	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	third-party-advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.