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CVE-2026-63830— net: skmsg: preserve sg.copy across SG transforms

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sk_msg sg.copy位图在SG转换过程中未同步，可能导致外部支持的条目在BPF存储中被暴露为可写数据，从而修改原始页面缓存。

CVSS 9.4 · Critical EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< f126eed589eec6f201405abbc398844042ef6d57 affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< 31a110642b5fb5e61940cbcfb503445ac4f28017 affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< 9bb86d8184b37503816150c4a6ad3c17dfdbe827 affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< 0eb4c16c4adb262763bda870a8ed38a1a9dec7ec affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< d22cc92bc41290e5783a72375e0843d9435f6001 affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< 1acdd14c0990dd1cd4b6534f00366d2e6dfce05f affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< 21ed9540a8e1906dfcbc1bb82ba9b4de4fa4bd6d affected
d3b18ad31f93d0b6bae105c679018a1ba7daa9ca< 406e8a651a7b854c41fecd5117bb282b3a6c2c6b affected
… +10 more rows
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I. Basic Information for CVE-2026-63830

Vulnerability Information
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Vulnerability Title
net: skmsg: preserve sg.copy across SG transforms
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: skmsg: preserve sg.copy across SG transforms The sk_msg sg.copy bitmap is part of the scatterlist entry ownership state. A set bit tells sk_msg_compute_data_pointers() not to expose the entry through writable BPF ctx->data. This protects entries backed by pages that are not private to the sk_msg, such as splice-backed file page-cache pages. Several sk_msg transform paths move, copy, split, or compact msg->sg.data[] entries without moving the matching sg.copy bit. This can make an externally backed entry arrive at a new slot with a clear copy bit. A later SK_MSG verdict can then expose sg_virt(sge) as writable ctx->data and BPF stores can modify the original page cache. Keep sg.copy synchronized with sg.data[] whenever entries are transferred, shifted, split, or copied into a new sk_msg. Clear the bit when an entry is replaced by a newly allocated private page or freed. This covers the BPF pull/push/pop helpers, sk_msg_shift_left/right(), sk_msg_xfer(), and tls_split_open_record(), including the partial tail entry created during TLS open-record splitting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
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sk_msg sg.copy位图在SG转换过程中未同步，可能导致外部支持的条目在BPF存储中被暴露为可写数据，从而修改原始页面缓存。
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 d3b18ad31f93d0b6bae105c679018a1ba7daa9ca ~ f126eed589eec6f201405abbc398844042ef6d57 -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-63830

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III. Intelligence Information for CVE-2026-63830

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Patches & Fixes for CVE-2026-63830 (8)

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-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-64056 9.8 CRITICAL net: ethernet: cortina: Make RX SKB per-port
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64055 9.8 CRITICAL net: ethernet: cortina: Carry over frag counter
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-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-63922 9.8 CRITICAL ipv6: exthdrs: refresh nh after handling HAO option

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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