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CVE-2025-39782

jbd2: prevent softlockup in jbd2_log_do_checkpoint()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.297, 5.10.241, 5.15.190, 6.1.149, 6.6.103, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in f683d611518d30334813eecf9a8c687453e2800e; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in f7ee8fd689e6d534f9fd2494b9266f7998082e65; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in 84ff98c1ea19acd3f9389e4bb6061364e943f85e; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in 26cb9aad94cb1811d8fae115594cc71fa3d91ab0; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in 41f40038de62e8306897cf6840791b268996432a; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in 429d50cbaff45090d52a1ea850d5de8c14881ee7; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in 3faac5e1d14c63260fd1bf789d96bde3ab3d9e54; From f93ea411b73594f7d144855fd34278bcf34a9afc · fixed in 9d98cf4632258720f18265a058e62fde120c0151

  • Linux Linux

    2.6.16

  • KernelLinux

    From 2.6.16 · fixed in 5.4.297; From 5.5.0 · fixed in 5.10.241; From 5.11.0 · fixed in 5.15.190; From 5.16.0 · fixed in 6.1.149; From 6.2.0 · fixed in 6.6.103; From 6.7.0 · fixed in 6.12.44; From 6.13.0 · fixed in 6.16.4

References 8

git.kernel.org