Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-53362— ipv6: account for fraggap on the paged allocation path

Quick assessment

Affected
Linux Linux
Exploitation
Confirmed exploitation in the wild; remediate immediately
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IPv6在paged分配路径上未正确处理fraggap，导致线性区域大小不足而pagedlen过大，进而造成越界写入skb_shared_info。以下版本受到影响：6.0版本。

CVSS 7.8 · High KEV EPSS 0.71% · P52

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03< 14200d435af9a9eeb444f529fc2f689a236b7962 affected
773ba4fe9104a64a54d1c00f0fb6ffb95def2b03< 65fb14cbebb0cd0eff903a22d33537ddc8b95769 affected
773ba4fe9104a64a54d1c00f0fb6ffb95def2b03< 46f201f8b4c39633a1fa3dc12459f506d470993d affected
773ba4fe9104a64a54d1c00f0fb6ffb95def2b03< 6374fb9edf72c67a118a2c214a0dddd04c921e0a affected
773ba4fe9104a64a54d1c00f0fb6ffb95def2b03< e9eacf19281ea2498b36291b56c9606118c2d74e affected
773ba4fe9104a64a54d1c00f0fb6ffb95def2b03< 736b380e28d0480c7bc3e022f1950f31fe53a7c5 affected
6.0 affected
< 6.0 unaffected
… +6 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-53362

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ipv6: account for fraggap on the paged allocation path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen), alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap (datalen = length + fraggap). When fraggap is non-zero, this is not the first skb and transhdrlen is zero. The fraggap bytes carried over from the previous skb are copied just past the fragment headers in the new skb's linear area. The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount, and the copy writes past skb->end into the trailing skb_shared_info. An unprivileged user can trigger this via a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES. The bad accounting was introduced by commit 773ba4fe9104 ("ipv6: avoid partial copy for zc"). Before commit ce650a166335 ("udp6: Fix __ip6_append_data()'s handling of MSG_SPLICE_PAGES"), the negative copy value caused -EINVAL to be returned. That later commit allowed MSG_SPLICE_PAGES to proceed in this case, making the corruption triggerable. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic. Since a negative copy is no longer expected for a valid MSG_SPLICE_PAGES case, remove the MSG_SPLICE_PAGES exception from the negative copy check.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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IPv6在paged分配路径上未正确处理fraggap，导致线性区域大小不足而pagedlen过大，进而造成越界写入skb_shared_info。以下版本受到影响：6.0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 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 ~ 14200d435af9a9eeb444f529fc2f689a236b7962 -
Linux Linux 6.0 -

II. Public POCs for CVE-2026-53362

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-53362

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-53362 (6)

Same Patch Batch · Linux · 2026-07-04 · 4 CVEs total

CVE-2026-53360 8.8 HIGH KVM: SEV: Require in-GHCB scratch area if GHCB v2+ is in use
CVE-2026-53359 8.8 HIGH KVM: x86: Fix shadow paging use-after-free due to unexpected role
CVE-2026-53361 7.1 HIGH af_unix: Set gc_in_progress to true in unix_gc().

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53362

No comments yet

Leave a comment