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CVE-2025-40182— crypto: skcipher - Fix reqsize handling

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skcipher未正确设置reqsize，可能导致内存损坏。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux afddce13ce81d52a13898fa0700917835c71acd6< f041339d6b9a5a46437f0c48fc7279c92af7a513 affected
afddce13ce81d52a13898fa0700917835c71acd6< 229c586b5e86979badb7cb0d38717b88a9e95ddd affected
6.16 affected
< 6.16 unaffected
6.17.4≤ 6.17.* unaffected
6.18≤ * unaffected
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I. Basic Information for CVE-2025-40182

Vulnerability Information
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Vulnerability Title
crypto: skcipher - Fix reqsize handling
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: crypto: skcipher - Fix reqsize handling Commit afddce13ce81d ("crypto: api - Add reqsize to crypto_alg") introduced cra_reqsize field in crypto_alg struct to replace type specific reqsize fields. It looks like this was introduced specifically for ahash and acomp from the commit description as subsequent commits add necessary changes in these alg frameworks. However, this is being recommended for use in all crypto algs [1] instead of setting reqsize using crypto_*_set_reqsize(). Using cra_reqsize in skcipher algorithms, hence, causes memory corruptions and crashes as the underlying functions in the algorithm framework have not been updated to set the reqsize properly from cra_reqsize. [2] Add proper set_reqsize calls in the skcipher init function to properly initialize reqsize for these algorithms in the framework. [1]: https://lore.kernel.org/linux-crypto/aCL8BxpHr5OpT04k@gondor.apana.org.au/ [2]: https://gist.github.com/Pratham-T/24247446f1faf4b7843e4014d5089f6b
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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skcipher未正确设置reqsize，可能导致内存损坏。
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 afddce13ce81d52a13898fa0700917835c71acd6 ~ f041339d6b9a5a46437f0c48fc7279c92af7a513 -
Linux Linux 6.16 -

II. Public POCs for CVE-2025-40182

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III. Intelligence Information for CVE-2025-40182

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Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total

CVE-2025-40176 9.8 CRITICAL tls: wait for pending async decryptions if tls_strp_msg_hold fails
CVE-2025-40140 8.8 HIGH net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast
CVE-2025-40186 8.1 HIGH tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
CVE-2025-40168 8.1 HIGH smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().
CVE-2025-40133 8.1 HIGH mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().
CVE-2025-40158 8.1 HIGH ipv6: use RCU in ip6_output()
CVE-2025-40135 8.1 HIGH ipv6: use RCU in ip6_xmit()
CVE-2025-40204 8.1 HIGH sctp: Fix MAC comparison to be constant-time
CVE-2025-40141 8.0 HIGH Bluetooth: ISO: Fix possible UAF on iso_conn_free
CVE-2025-40151 7.8 HIGH LoongArch: BPF: No support of struct argument in trampoline programs
CVE-2025-40159 7.8 HIGH xsk: Harden userspace-supplied xdp_desc validation
CVE-2025-40167 7.8 HIGH ext4: detect invalid INLINE_DATA + EXTENTS flag combination
CVE-2025-40172 7.8 HIGH accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40166 7.8 HIGH drm/xe/guc: Check GuC running state before deregistering exec queue
CVE-2025-40149 7.8 HIGH tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().
CVE-2025-40165 7.8 HIGH media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
CVE-2025-40201 7.8 HIGH kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
CVE-2025-40203 7.8 HIGH listmount: don't call path_put() under namespace semaphore
CVE-2025-40205 7.8 HIGH btrfs: avoid potential out-of-bounds in btrfs_encode_fh()
CVE-2025-40199 7.8 HIGH page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches

Showing top 20 of 96 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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Same vendor: Linux

V. Comments for CVE-2025-40182

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