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CVE-2026-63926— bpf: sockmap: fix tail fragment offset in bpf_msg_push_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基金会开源的一款操作系统内核。 Linux kernel 4.20版本存在安全漏洞，该漏洞源于bpf_msg_push_data函数在处理散列表项中插入数据时，对右片段的偏移量计算错误，使用全局插入点而非局部偏移，导致分割布局不一致。

CVSS 8.4 · High EPSS 0.20% · P9

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 6fff607e2f14bd7c63c06c464a6f93b8efbabe28< f14609d8146707452e0822f3c8154674ce677251 affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< d81b323af2dcee47573907ccb89c0df9b45cb2e2 affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< aeb95146848d12206e1b2cfacd4f40e21ce81d94 affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< 96b72672ce849a1402730238e64d9b20bf06a96d affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< 3075c21d2d76c0067f4a382765b43d6cc10470f1 affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< 5e19028667963fb371ebb00cecc2a473ef92056b affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< 63f64a510c7917658ddf4d073ece73914ee25346 affected
6fff607e2f14bd7c63c06c464a6f93b8efbabe28< f72eed9b84fb771019a955908132410a9ba9ea3f affected
… +10 more rows
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I. Basic Information for CVE-2026-63926

Vulnerability Information
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Vulnerability Title
bpf: sockmap: fix tail fragment offset in bpf_msg_push_data
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: sockmap: fix tail fragment offset in bpf_msg_push_data When bpf_msg_push_data() inserts data in the middle of a scatterlist entry, it splits the original entry into a left fragment and a right fragment. The right fragment offset is page-local, but the code advances it with `start`, which is the message-global insertion point. For inserts into a non-first SG entry, this over-advances the offset and leaves the split layout inconsistent. Advance the right fragment offset by the fragment-local delta, `start - offset`, which matches the length removed from the front of the original entry.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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基金会开源的一款操作系统内核。 Linux kernel 4.20版本存在安全漏洞，该漏洞源于bpf_msg_push_data函数在处理散列表项中插入数据时，对右片段的偏移量计算错误，使用全局插入点而非局部偏移，导致分割布局不一致。
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 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 ~ f14609d8146707452e0822f3c8154674ce677251 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-63926

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III. Intelligence Information for CVE-2026-63926

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Patches & Fixes for CVE-2026-63926 (6)

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-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
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-2026-64035 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-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64122 9.8 CRITICAL net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64102 9.8 CRITICAL RDMA/siw: Reject MPA FPDU length underflow before signed receive math
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-64007 9.8 CRITICAL netfilter: synproxy: refresh tcphdr after skb_ensure_writable
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-63926

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