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CVE-2025-39702— ipv6: sr: 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ipv6/sr模块MAC比较未使用恒定时间。

CVSS 9.8 · Critical EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux bf355b8d2c30a289232042cacc1cfaea4923936c< ff55a452d56490047f5233cc48c5d933f8586884 affected
bf355b8d2c30a289232042cacc1cfaea4923936c< 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0 affected
bf355b8d2c30a289232042cacc1cfaea4923936c< 86b6d34717fe0570afce07ee79b8eeb40341f831 affected
bf355b8d2c30a289232042cacc1cfaea4923936c< 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3 affected
bf355b8d2c30a289232042cacc1cfaea4923936c< b3967c493799e63f648e9c7b6cb063aa2aed04e7 affected
bf355b8d2c30a289232042cacc1cfaea4923936c< f7878d47560d61e3f370aca3cebb8f42a55b990a affected
bf355b8d2c30a289232042cacc1cfaea4923936c< a458b2902115b26a25d67393b12ddd57d1216aaa affected
4.10 affected
… +8 more rows
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I. Basic Information for CVE-2025-39702

Vulnerability Information
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Vulnerability Title
ipv6: sr: 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: ipv6: sr: 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:L/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ipv6/sr模块MAC比较未使用恒定时间。
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 bf355b8d2c30a289232042cacc1cfaea4923936c ~ ff55a452d56490047f5233cc48c5d933f8586884 -
Linux Linux 4.10 -

II. Public POCs for CVE-2025-39702

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III. Intelligence Information for CVE-2025-39702

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Same Patch Batch · Linux · 2025-09-05 · 60 CVEs total

CVE-2025-39726 9.8 CRITICAL s390/ism: fix concurrency management in ism_cmd()
CVE-2025-39682 9.8 CRITICAL tls: fix handling of zero-length records on the rx_list
CVE-2025-38734 9.8 CRITICAL net/smc: fix UAF on smcsk after smc_listen_out()
CVE-2025-39703 9.8 CRITICAL net, hsr: reject HSR frame if skb can't hold tag
CVE-2025-39673 9.8 CRITICAL ppp: fix race conditions in ppp_fill_forward_path
CVE-2025-38737 9.8 CRITICAL cifs: Fix oops due to uninitialised variable
CVE-2025-39704 8.8 HIGH LoongArch: KVM: Fix stack protector issue in send_ipi_data()
CVE-2025-39718 8.4 HIGH vsock/virtio: Validate length in packet header before skb_put()
CVE-2025-39714 7.8 HIGH media: usbtv: Lock resolution while streaming
CVE-2025-39711 7.8 HIGH media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
CVE-2025-39710 7.8 HIGH media: venus: Add a check for packet size after reading from shared memory
CVE-2025-39696 7.8 HIGH ALSA: hda: tas2781: Fix wrong reference of tasdevice_priv
CVE-2025-39717 7.8 HIGH open_tree_attr: do not allow id-mapping changes without OPEN_TREE_CLONE
CVE-2025-39698 7.8 HIGH io_uring/futex: ensure io_futex_wait() cleans up properly on failure
CVE-2025-39697 7.8 HIGH NFS: Fix a race when updating an existing write
CVE-2025-38731 7.8 HIGH drm/xe: Fix vm_bind_ioctl double free bug
CVE-2025-39691 7.8 HIGH fs/buffer: fix use-after-free when call bh_read() helper
CVE-2025-39689 7.8 HIGH ftrace: Also allocate and copy hash for reading of filter files
CVE-2025-39677 7.8 HIGH net/sched: Fix backlog accounting in qdisc_dequeue_internal
CVE-2025-39680 7.8 HIGH i2c: rtl9300: Fix out-of-bounds bug in rtl9300_i2c_smbus_xfer

Showing top 20 of 60 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39702

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