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CVE-2026-63912— xfrm: esp: restore combined single-frag length gate

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ESP快速路径中组合单分片长度门限检查问题，可能导致skb_page_frag_refill()回退到单页而目标sg仍跨越组合的skb->data_len。

CVSS 9.8 · Critical EPSS 0.71% · P51

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 28

VendorProduct Version RangeStatus
Linux Linux c075c3ea031757f8ea2d34567565b61a868c08d5< 566295735530ee513326049b0540f32ec050bf2e affected
a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea< 5d7ab86e2b6bc23054616bf6ac562013bf60af8c affected
5bd8baab087dff657e05387aee802e70304cc813< 36519e3d941fc99d3b52c134dbaf311f987a4708 affected
5bd8baab087dff657e05387aee802e70304cc813< 322e48187e0245ab2fff6fec2220b0cae677dbec affected
5bd8baab087dff657e05387aee802e70304cc813< b84091ceddc9f133229dceab3ccc930bf27f9cba affected
5bd8baab087dff657e05387aee802e70304cc813< c093468aea8277f77272a4f199b2e15e19cabb59 affected
5bd8baab087dff657e05387aee802e70304cc813< 65f3b3fc2347b89fe21db1e92c7681368415f095 affected
5bd8baab087dff657e05387aee802e70304cc813< dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40 affected
… +20 more rows
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I. Basic Information for CVE-2026-63912

Vulnerability Information
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Vulnerability Title
xfrm: esp: restore combined single-frag length gate
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len. Restore this combined-length page gate for both IPv4 and IPv6.
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: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ESP快速路径中组合单分片长度门限检查问题，可能导致skb_page_frag_refill()回退到单页而目标sg仍跨越组合的skb->data_len。
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 c075c3ea031757f8ea2d34567565b61a868c08d5 ~ 566295735530ee513326049b0540f32ec050bf2e -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-63912

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III. Intelligence Information for CVE-2026-63912

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Patches & Fixes for CVE-2026-63912 (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-2026-64046 9.8 CRITICAL net: tls: prevent chain-after-chain in plain text SG
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
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-2026-64150 9.8 CRITICAL netfilter: nft_inner: release local_lock before re-enabling softirqs
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64162 9.8 CRITICAL idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
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-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-64016 9.8 CRITICAL ksmbd: fix durable reconnect error path file lifetime
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-63886 9.8 CRITICAL scsi: target: iscsi: Validate CHAP_R length before base64 decode
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans

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-2026-63912

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