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CVE-2025-38496— dm-bufio: fix sched in atomic context

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于原子上下文中触发调度，可能导致死锁。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 450e8dee51aa6fa1dd0f64073e88235f1a77b035< 469a39a33a9934af157299bf11c58f6e6cb53f85 affected
450e8dee51aa6fa1dd0f64073e88235f1a77b035< 68860d1ade385eef9fcdbf6552f061283091fdb8 affected
450e8dee51aa6fa1dd0f64073e88235f1a77b035< 3edfdb1d4ef81320dae0caa40bc24baf8c1bbb86 affected
450e8dee51aa6fa1dd0f64073e88235f1a77b035< b1bf1a782fdf5c482215c0c661b5da98b8e75773 affected
6.4 affected
< 6.4 unaffected
6.6.100≤ 6.6.* unaffected
6.12.40≤ 6.12.* unaffected
… +2 more rows
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I. Basic Information for CVE-2025-38496

Vulnerability Information
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Vulnerability Title
dm-bufio: fix sched in atomic context
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-bufio: fix sched in atomic context If "try_verify_in_tasklet" is set for dm-verity, DM_BUFIO_CLIENT_NO_SLEEP is enabled for dm-bufio. However, when bufio tries to evict buffers, there is a chance to trigger scheduling in spin_lock_bh, the following warning is hit: BUG: sleeping function called from invalid context at drivers/md/dm-bufio.c:2745 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 123, name: kworker/2:2 preempt_count: 201, expected: 0 RCU nest depth: 0, expected: 0 4 locks held by kworker/2:2/123: #0: ffff88800a2d1548 ((wq_completion)dm_bufio_cache){....}-{0:0}, at: process_one_work+0xe46/0x1970 #1: ffffc90000d97d20 ((work_completion)(&dm_bufio_replacement_work)){....}-{0:0}, at: process_one_work+0x763/0x1970 #2: ffffffff8555b528 (dm_bufio_clients_lock){....}-{3:3}, at: do_global_cleanup+0x1ce/0x710 #3: ffff88801d5820b8 (&c->spinlock){....}-{2:2}, at: do_global_cleanup+0x2a5/0x710 Preemption disabled at: [<0000000000000000>] 0x0 CPU: 2 UID: 0 PID: 123 Comm: kworker/2:2 Not tainted 6.16.0-rc3-g90548c634bd0 #305 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 Workqueue: dm_bufio_cache do_global_cleanup Call Trace: <TASK> dump_stack_lvl+0x53/0x70 __might_resched+0x360/0x4e0 do_global_cleanup+0x2f5/0x710 process_one_work+0x7db/0x1970 worker_thread+0x518/0xea0 kthread+0x359/0x690 ret_from_fork+0xf3/0x1b0 ret_from_fork_asm+0x1a/0x30 </TASK> That can be reproduced by: veritysetup format --data-block-size=4096 --hash-block-size=4096 /dev/vda /dev/vdb SIZE=$(blockdev --getsz /dev/vda) dmsetup create myverity -r --table "0 $SIZE verity 1 /dev/vda /dev/vdb 4096 4096 <data_blocks> 1 sha256 <root_hash> <salt> 1 try_verify_in_tasklet" mount /dev/dm-0 /mnt -o ro echo 102400 > /sys/module/dm_bufio/parameters/max_cache_size_bytes [read files in /mnt]
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 多款产品安全漏洞
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，该漏洞源于原子上下文中触发调度，可能导致死锁。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 450e8dee51aa6fa1dd0f64073e88235f1a77b035 ~ 469a39a33a9934af157299bf11c58f6e6cb53f85 -
Linux Linux 6.4 -

II. Public POCs for CVE-2025-38496

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III. Intelligence Information for CVE-2025-38496

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Same Patch Batch · Linux · 2025-07-28 · 29 CVEs total

CVE-2025-38488 9.8 CRITICAL smb: client: fix use-after-free in crypt_message when using async crypto
CVE-2025-38471 9.8 CRITICAL tls: always refresh the queue when reading sock
CVE-2025-38472 9.8 CRITICAL netfilter: nf_conntrack: fix crash due to removal of uninitialised entry
CVE-2025-38476 9.8 CRITICAL rpl: Fix use-after-free in rpl_do_srh_inline().
CVE-2025-38490 9.8 CRITICAL net: libwx: remove duplicate page_pool_put_full_page()
CVE-2025-38495 8.8 HIGH HID: core: ensure the allocated report buffer can contain the reserved report ID
CVE-2025-38491 8.2 HIGH mptcp: make fallback action and fallback decision atomic
CVE-2025-38478 7.8 HIGH comedi: Fix initialization of data for instructions that write to subdevice
CVE-2025-38485 7.8 HIGH iio: accel: fxls8962af: Fix use after free in fxls8962af_fifo_flush
CVE-2025-38486 7.8 HIGH soundwire: Revert "soundwire: qcom: Add set_channel_map api support"
CVE-2025-38484 7.8 HIGH iio: backend: fix out-of-bound write
CVE-2025-38477 7.8 HIGH net/sched: sch_qfq: Fix race condition on qfq_aggregate
CVE-2025-38475 7.8 HIGH smc: Fix various oops due to inet_sock type confusion.
CVE-2025-38494 7.8 HIGH HID: core: do not bypass hid_hw_raw_request
CVE-2025-38470 7.8 HIGH net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime
CVE-2025-38493 tracing/osnoise: Fix crash in timerlat_dump_stack()
CVE-2025-38492 netfs: Fix race between cache write completion and ALL_QUEUED being set
CVE-2025-38483 comedi: das16m1: Fix bit shift out of bounds
CVE-2025-38489 s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again
CVE-2025-38497 usb: gadget: configfs: Fix OOB read on empty string write

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38496

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