# CVE-2025-40196: linux: In the Linux kernel, the following vulnerability has been resolved:  fs: quota: create dedicated workqueue for quota_...

CVE-2025-40196 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2025-40196, released November 12, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-40196
- Priority: High
- CVSS: n/a (important)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 12, 2025

## 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 ...

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool6.12 amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-64kb sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-default sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.8.1.160000.2.5 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-default-base sles 16.0 | 6.12.0-160000.8.1.160000.2.5 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-docs sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-livepatch-6.12.55-74.119 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-source sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-syms sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.8.1 | [OPENSUSE-SU-2025:20172-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20172-1.md) | Dec 19, 2025 |
| Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.8.1 | [SUSE-SU-2026:20015-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-20015-1.md) | Dec 19, 2025 |
| Linux | kernel6.12 amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-devel amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-headers amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-tools amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | linux Debian 12.15 (bookworm) | 6.1.180-1 | [DEBIAN-CVE-2025-40196](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40196.md) | Nov 12, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.12.57-1 | [DEBIAN-CVE-2025-40196](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40196.md) | Nov 12, 2025 |
| Linux | linux Debian 14 | 6.17.6-1 | [DEBIAN-CVE-2025-40196](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40196.md) | Nov 12, 2025 |
| Linux | perf6.12 amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | python3-perf6.12 amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |
| Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.55-74.119.amzn2023 | [ALAS2023-2025-1316](https://patchblox.com/security/data/fix/linux/alas2023-2025-1316.md) | Dec 8, 2025 |

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