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CVE-2025-40204— sctp: Fix MAC comparison to be constant-time

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MAC比较非恒定时间，可能导致时序攻击。

CVSS 8.1 · High EPSS 0.46% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b93fa8dc521d00d2d44bf034fb90e0d79b036617 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0e8b8c326c2a6de4d837b1bb034ea704f4690d77 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9c05d44ec24126fc283835b68f82dba3ae985209 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ed3044b9c810c5c24eb2830053fbfe5fd134c5d4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8019b3699289fce3f10b63f98601db97b8d105b0 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0b32ff285ff6f6f1ac1d9495787ccce8837d6405 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< dd91c79e4f58fbe2898dac84858033700e0e99fb affected
… +10 more rows
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I. Basic Information for CVE-2025-40204

Vulnerability Information
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Vulnerability Title
sctp: Fix MAC comparison to be constant-time
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sctp: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/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MAC比较非恒定时间，可能导致时序攻击。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ b93fa8dc521d00d2d44bf034fb90e0d79b036617 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-40204

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III. Intelligence Information for CVE-2025-40204

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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-2025-40135 8.1 HIGH ipv6: use RCU in ip6_xmit()
CVE-2025-40158 8.1 HIGH ipv6: use RCU in ip6_output()
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-2025-40141 8.0 HIGH Bluetooth: ISO: Fix possible UAF on iso_conn_free
CVE-2025-40199 7.8 HIGH page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches
CVE-2025-40172 7.8 HIGH accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40205 7.8 HIGH btrfs: avoid potential out-of-bounds in btrfs_encode_fh()
CVE-2025-40203 7.8 HIGH listmount: don't call path_put() under namespace semaphore
CVE-2025-40201 7.8 HIGH kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
CVE-2025-40169 7.8 HIGH bpf: Reject negative offsets for ALU ops
CVE-2025-40165 7.8 HIGH media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
CVE-2025-40166 7.8 HIGH drm/xe/guc: Check GuC running state before deregistering exec queue
CVE-2025-40167 7.8 HIGH ext4: detect invalid INLINE_DATA + EXTENTS flag combination
CVE-2025-40159 7.8 HIGH xsk: Harden userspace-supplied xdp_desc validation
CVE-2025-40151 7.8 HIGH LoongArch: BPF: No support of struct argument in trampoline programs
CVE-2025-40149 7.8 HIGH tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40204

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