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CVE-2026-52937— tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tap_ioctl()函数中SIOCGIFHWADDR路径未初始化栈上的struct sockaddr_storage，导致内核栈内存泄露，可能使攻击者获取内核.text和直接映射指针，绕过KASLR。以下版本受到影响：5.5之前版本、5.11之前版本、5.12之前版本。

AI Predicted 5.5 Difficulty: Trivial EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 3b23a32a63219f51a5298bc55a65ecee866e79d0< 719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb affected
3b23a32a63219f51a5298bc55a65ecee866e79d0< 05305e832be7b9d65b2b72caacf7d850b3942b2a affected
3b23a32a63219f51a5298bc55a65ecee866e79d0< bddc09212c24934643bd44fc794748d2bbb3b6cd affected
176188cff67ec1aa55103647b61d02315cc38e98 affected
1fc205d9e400f069ebf30d3faa6ec2bab2cbd7b4 affected
4d0ae760c02c98fc78b78d3a0509896bc648ad1c affected
5.4.103< 5.5 affected
5.10.21< 5.11 affected
… +6 more rows
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I. Basic Information for CVE-2026-52937

Vulnerability Information
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Vulnerability Title
tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tap: fix stack info leak in tap_ioctl() SIOCGIFHWADDR In the SIOCGIFHWADDR path, tap_ioctl() copies 16 bytes of an uninitialised on-stack struct sockaddr_storage to userspace via ifr_hwaddr, but netif_get_mac_address() only writes sa_family and dev->addr_len (6 for Ethernet) bytes, leaving sa_data[6..13] uninitialised. Those 8 trailing bytes leak kernel stack contents; SIOCGIFHWADDR on a macvtap chardev returns kernel .text and direct-map pointers, defeating KASLR. Initialise ss at declaration.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于tap_ioctl()函数中SIOCGIFHWADDR路径未初始化栈上的struct sockaddr_storage，导致内核栈内存泄露，可能使攻击者获取内核.text和直接映射指针，绕过KASLR。以下版本受到影响：5.5之前版本、5.11之前版本、5.12之前版本。
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 3b23a32a63219f51a5298bc55a65ecee866e79d0 ~ 719007c3492f0f1f9e9cdbed8ac45ba45bb13eeb -
Linux Linux 5.12 -

II. Public POCs for CVE-2026-52937

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III. Intelligence Information for CVE-2026-52937

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Patches & Fixes for CVE-2026-52937 (3)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52937

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