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CVE-2026-63919— xfrm: input: hold netns during deferred transport reinjection

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于传输模式重注期间网络命名空间生命周期处理不当，可能导致网络命名空间指针失效。以下版本受到影响：5.6版本。

CVSS 8.8 · High EPSS 0.65% · P49

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7b3801927e52f8621de311277f7fc727635019e7< 7ee59eda8820b758ed29e1cd3222359c7b97302c affected
7b3801927e52f8621de311277f7fc727635019e7< 2df7059a18afb7d3aee6c36cad5d371c198111d4 affected
7b3801927e52f8621de311277f7fc727635019e7< 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa affected
7b3801927e52f8621de311277f7fc727635019e7< 48ce101cd630d6745b6923b5bad8358bc4c119da affected
7b3801927e52f8621de311277f7fc727635019e7< 55ddfc41451f01c588089cd74957a05311b6f202 affected
7b3801927e52f8621de311277f7fc727635019e7< 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e affected
7b3801927e52f8621de311277f7fc727635019e7< 9f67a36e91bb50d358760f381f233913fe5c09f8 affected
7b3801927e52f8621de311277f7fc727635019e7< c16f74dc1d75d0e2e7670076d5375deda110ebeb affected
… +10 more rows
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I. Basic Information for CVE-2026-63919

Vulnerability Information
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Vulnerability Title
xfrm: input: hold netns during deferred transport reinjection
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于传输模式重注期间网络命名空间生命周期处理不当，可能导致网络命名空间指针失效。以下版本受到影响：5.6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 7b3801927e52f8621de311277f7fc727635019e7 ~ 7ee59eda8820b758ed29e1cd3222359c7b97302c -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-63919

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III. Intelligence Information for CVE-2026-63919

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Patches & Fixes for CVE-2026-63919 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-64160 9.8 CRITICAL netfs: Fix potential for tearing in ->remote_i_size and ->zero_point
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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