CVE-2025-40196: linux
Vulnerability summary
CVE-2025-40196 is a medium (CVSS 5.7) vulnerability in linux. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 20 · Related 20Timeline
- 12-11-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: fs: quota: create dedicated workqueue for quota_release_work There is a kernel panic due to WARN_ONCE when panic_on_warn is set. This issue occurs when writeback is triggered due to sync call for an opened file(ie, writeback reason is WB_REASON_SYNC). When f2fs balance is needed at sync path, flush for quota_release_work is triggered. By default quota_release_work is queued to "events_unbound" queue which does not have WQ_MEM_RECLAIM flag. During f2fs balance "writeback" workqueue tries to flush quota_release_work causing kernel panic due to MEM_RECLAIM flag mismatch errors. This patch creates dedicated workqueue with WQ_MEM_RECLAIM flag for work quota_release_work. ------------[ cut here ]------------ WARNING: CPU: 4 PID: 14867 at kernel/workqueue.c:3721 check_flush_dependency+0x13c/0x148 Call trace: check_flush_dependency+0x13c/0x148 __flush_work+0xd0/0x398 flush_delayed_work+0x44/0x5c dquot_writeback_dquots+0x54/0x318 f2fs_do_quota_sync+0xb8/0x1a8 f2fs_write_checkpoint+0x3cc/0x99c f2fs_gc+0x190/0x750 f2fs_balance_fs+0x110/0x168 f2fs_write_single_data_page+0x474/0x7dc f2fs_write_data_pages+0x7d0/0xd0c do_writepages+0xe0/0x2f4 __writeback_single_inode+0x44/0x4ac writeback_sb_inodes+0x30c/0x538 wb_writeback+0xf4/0x440 wb_workfn+0x128/0x5d4 process_scheduled_works+0x1c4/0x45c worker_thread+0x32c/0x3e8 kthread+0x11c/0x1b0 ret_from_fork+0x10/0x20 Kernel panic - not syncing: kernel: panic_on_warn set ...
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
0.21%
Chance of exploitation in the next 30 days
Percentile
10%
Versus all other CVEs
30-day change
+0.01 pp
From 0.19% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu154 products
- linuxAll versions (No fix recorded) | < 6.8.0-106.106 | < 6.17.0-14.14
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1050.53 | < 6.17.0-1007.7
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.180-1 | < 6.12.57-1 | < 6.17.6-1
Linux1 product
- linux≥ 3e6ff207cd5bd924ad94cd1a7c633bcdac0ba1cb, < 8df2eedd371a1c24ecc4283581299d7737dfcd06 | ≥ bcacb52a985f1b6d280f698a470b873dfe52728a, < f846eacde280ecc3daedfe001580e3033565179e | ≥ 8ea87e34792258825d290f4dc5216276e91cb224, < f12039df1515d5daf7d92e586ece5cefeb39561b | ≥ ac6f420291b3fee1113f21d612fa88b628afab5b, < 8a09a62f0c8c6123c2f1864ed6d5f9eb144afaf0 | ≥ ac6f420291b3fee1113f21d612fa88b628afab5b, < 72b7ceca857f38a8ca7c5629feffc63769638974 | a5abba5e0e586e258ded3e798fe5f69c66fec198 | 6f3821acd7c3143145999248087de5fb4b48cf26 | ab6cfcf8ed2c7496f55d020b65b1d8cd55d9a2cb | ≥ 6.1.120, < 6.1.178 | ≥ 6.6.64, < 6.6.114 | ≥ 6.12.4, < 6.12.54 | ≥ 5.4.287, < 5.5 | ≥ 5.10.231, < 5.11 | ≥ 5.15.174, < 5.16 | 6.13
3 vendors · 156 products
