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CVE-2025-71161— dm-verity: disable recursive forward error correction

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，该漏洞源于递归前向纠正可能导致拒绝服务且功能失效。

CVSS 7.5 · High EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux a739ff3f543afbb4a041c16cd0182c8e8d366e70< 8b821ca892cfeeaf0bedc9fc72717294f67144d5 affected
a739ff3f543afbb4a041c16cd0182c8e8d366e70< e227d2b229c7529bd98d348efc55262ccf24ab35 affected
a739ff3f543afbb4a041c16cd0182c8e8d366e70< 897d9006e75f46f8bd7df78faa424327ae6a4bcf affected
a739ff3f543afbb4a041c16cd0182c8e8d366e70< 4220cb37406915c926c0e4a3dbab77cd9cceeb1e affected
a739ff3f543afbb4a041c16cd0182c8e8d366e70< 232948cf600fba69aff36b25d85ef91a73a35756 affected
a739ff3f543afbb4a041c16cd0182c8e8d366e70< d9f3e47d3fae0c101d9094bc956ed24e7a0ee801 affected
4.5 affected
< 4.5 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-71161

Vulnerability Information
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Vulnerability Title
dm-verity: disable recursive forward error correction
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: dm-verity: disable recursive forward error correction There are two problems with the recursive correction: 1. It may cause denial-of-service. In fec_read_bufs, there is a loop that has 253 iterations. For each iteration, we may call verity_hash_for_block recursively. There is a limit of 4 nested recursions - that means that there may be at most 253^4 (4 billion) iterations. Red Hat QE team actually created an image that pushes dm-verity to this limit - and this image just makes the udev-worker process get stuck in the 'D' state. 2. It doesn't work. In fec_read_bufs we store data into the variable "fio->bufs", but fio bufs is shared between recursive invocations, if "verity_hash_for_block" invoked correction recursively, it would overwrite partially filled fio->bufs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 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，该漏洞源于递归前向纠正可能导致拒绝服务且功能失效。
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 a739ff3f543afbb4a041c16cd0182c8e8d366e70 ~ 8b821ca892cfeeaf0bedc9fc72717294f67144d5 -
Linux Linux 4.5 -

II. Public POCs for CVE-2025-71161

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III. Intelligence Information for CVE-2025-71161

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Patches & Fixes for CVE-2025-71161 (4)

Same Patch Batch · Linux · 2026-01-23 · 34 CVEs total

CVE-2026-22984 9.8 CRITICAL libceph: prevent potential out-of-bounds reads in handle_auth_done()
CVE-2025-71159 9.8 CRITICAL btrfs: fix use-after-free warning in btrfs_get_or_create_delayed_node()
CVE-2025-71145 7.8 HIGH usb: phy: isp1301: fix non-OF device reference imbalance
CVE-2025-71155 7.8 HIGH KVM: s390: Fix gmap_helper_zap_one_page() again
CVE-2026-22980 7.8 HIGH nfsd: provide locking for v4_end_grace
CVE-2026-22988 7.8 HIGH arp: do not assume dev_hard_header() does not change skb->head
CVE-2025-71158 7.8 HIGH gpio: mpsse: ensure worker is torn down
CVE-2025-71146 7.5 HIGH netfilter: nf_conncount: fix leaked ct in error paths
CVE-2025-71150 7.5 HIGH ksmbd: Fix refcount leak when invalid session is found on session lookup
CVE-2026-22992 7.5 HIGH libceph: return the handler error from mon_handle_auth_done()
CVE-2026-22991 7.5 HIGH libceph: make free_choose_arg_map() resilient to partial allocation
CVE-2026-22990 7.5 HIGH libceph: replace overzealous BUG_ON in osdmap_apply_incremental()
CVE-2026-22983 net: do not write to msg_get_inq in callee
CVE-2026-22995 ublk: fix use-after-free in ublk_partition_scan_work
CVE-2026-22985 idpf: Fix RSS LUT NULL pointer crash on early ethtool operations
CVE-2026-22986 gpiolib: fix race condition for gdev->srcu
CVE-2026-22987 net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy
CVE-2026-22989 nfsd: check that server is running in unlock_filesystem
CVE-2026-22993 idpf: Fix RSS LUT NULL ptr issue after soft reset
CVE-2026-22994 bpf: Fix reference count leak in bpf_prog_test_run_xdp()

Showing top 20 of 34 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-71161

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