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CVE-2026-46185— smb/client: fix out-of-bounds read in symlink_data()

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smb/client中symlink_data函数存在越界读取，由于smb2_check_message返回成功时未对长度进行验证，导致访问err->ErrorContextCount或err->ByteCount时可能发生越界读取。

CVSS 9.1 · Critical EPSS 0.53% · P43

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 76894f3e2f71177747b8b4763fb180e800279585< 2be11faf79e49fb8250a181ff0b4d2b2f084af83 affected
76894f3e2f71177747b8b4763fb180e800279585< ef6495d4df6e7af8f3de67e65150881c880f696c affected
76894f3e2f71177747b8b4763fb180e800279585< 15dc0a4de743a1aaa7b859b3aea79f08c695396c affected
76894f3e2f71177747b8b4763fb180e800279585< b8c8a704f0bc133deb171f6aeb6f3a684203e212 affected
76894f3e2f71177747b8b4763fb180e800279585< b9561402489d41149f63e001a74384863b7b30a6 affected
76894f3e2f71177747b8b4763fb180e800279585< d62b8d236fab503c6fec1d3e9a38bea71feaca20 affected
2d046892a493d9760c35fdaefc3017f27f91b621 affected
6.0.16< 6.1 affected
… +8 more rows
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I. Basic Information for CVE-2026-46185

Vulnerability Information
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Vulnerability Title
smb/client: fix out-of-bounds read in symlink_data()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb/client: fix out-of-bounds read in symlink_data() Since smb2_check_message() returns success without length validation for the symlink error response, in symlink_data() it is possible for iov->iov_len to be smaller than sizeof(struct smb2_err_rsp). If the buffer only contains the base SMB2 header (64 bytes), accessing err->ErrorContextCount (at offset 66) or err->ByteCount later in symlink_data() will cause an out-of-bounds read.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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smb/client中symlink_data函数存在越界读取，由于smb2_check_message返回成功时未对长度进行验证，导致访问err->ErrorContextCount或err->ByteCount时可能发生越界读取。
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 76894f3e2f71177747b8b4763fb180e800279585 ~ 2be11faf79e49fb8250a181ff0b4d2b2f084af83 -
Linux Linux 6.1 -

II. Public POCs for CVE-2026-46185

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III. Intelligence Information for CVE-2026-46185

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Patches & Fixes for CVE-2026-46185 (5)

Same Patch Batch · Linux · 2026-05-28 · 135 CVEs total

CVE-2026-46195 9.8 CRITICAL smb: client: validate dacloffset before building DACL pointers
CVE-2026-46135 9.8 CRITICAL nvmet-tcp: fix race between ICReq handling and queue teardown
CVE-2026-46137 9.8 CRITICAL mptcp: pm: ADD_ADDR rtx: fix potential data-race
CVE-2026-46115 9.8 CRITICAL block: add pgmap check to biovec_phys_mergeable
CVE-2026-46155 9.1 CRITICAL smb/client: fix out-of-bounds read in smb2_compound_op()
CVE-2026-46119 9.1 CRITICAL libceph: Fix slab-out-of-bounds access in auth message processing
CVE-2026-46238 8.8 HIGH batman-adv: stop caching unowned originator pointers in BAT IV
CVE-2026-46174 8.8 HIGH x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache
CVE-2026-46125 8.8 HIGH wifi: mac80211: remove station if connection prep fails
CVE-2026-46198 8.8 HIGH batman-adv: fix integer overflow on buff_pos
CVE-2026-46166 8.8 HIGH wifi: mac80211: use safe list iteration in radar detect work
CVE-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46212 8.8 HIGH batman-adv: bla: prevent use-after-free when deleting claims
CVE-2026-46152 8.8 HIGH wifi: mac80211: drop stray 'static' from fast-RX rx_result
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
CVE-2026-46201 7.8 HIGH drm/xe: Fix dma-buf attachment leak in xe_gem_prime_import()
CVE-2026-46227 7.8 HIGH sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-46185

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