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CVE-2026-46158— mptcp: pm: ADD_ADDR rtx: always decrease sk refcount

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mptcp pm中ADD_ADDR重传时未始终减少套接字引用计数，可能导致引用泄漏。

AI Predicted 3.7 Difficulty: Moderate EPSS 0.13% · P3

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 00cfd77b9063dcdf3628a7087faba60de85a9cc8< e9ba34301d2e90f63f97c76ad9eb98e5250fe961 affected
00cfd77b9063dcdf3628a7087faba60de85a9cc8< 81d8142148164176385c279c7c1e1d581867423d affected
00cfd77b9063dcdf3628a7087faba60de85a9cc8< 9426265e157dd77ec237c795901ed4dea6d69b5c affected
00cfd77b9063dcdf3628a7087faba60de85a9cc8< b41dd76f3b9735096c21d3e799a2b9fe36498d57 affected
00cfd77b9063dcdf3628a7087faba60de85a9cc8< acd3d3562315c99f3c0db16f0fcc5f0306638982 affected
00cfd77b9063dcdf3628a7087faba60de85a9cc8< 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae affected
00cfd77b9063dcdf3628a7087faba60de85a9cc8< 9634cb35af17019baec21ca648516ce376fa10e6 affected
5.10 affected
… +8 more rows
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I. Basic Information for CVE-2026-46158

Vulnerability Information
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Vulnerability Title
mptcp: pm: ADD_ADDR rtx: always decrease sk refcount
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".
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mptcp pm中ADD_ADDR重传时未始终减少套接字引用计数，可能导致引用泄漏。
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 00cfd77b9063dcdf3628a7087faba60de85a9cc8 ~ e9ba34301d2e90f63f97c76ad9eb98e5250fe961 -
Linux Linux 5.10 -

II. Public POCs for CVE-2026-46158

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III. Intelligence Information for CVE-2026-46158

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Patches & Fixes for CVE-2026-46158 (5)

Other References for CVE-2026-46158 (2)

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-2026-46185 9.1 CRITICAL smb/client: fix out-of-bounds read in symlink_data()
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-2026-46212 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-2026-46113 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected GFN
CVE-2026-46138 8.1 HIGH Bluetooth: hci_event: Fix OOB read and infinite loop in hci_le_create_big_complete_evt
CVE-2026-46232 8.1 HIGH HID: playstation: Clamp num_touch_reports
CVE-2026-46215 7.8 HIGH drm: Set old handle to NULL before prime swap in change_handle
CVE-2026-46176 7.8 HIGH RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init()
CVE-2026-46157 7.8 HIGH ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger

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-2026-46158

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