CVE-2026-53362— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
已确认在野利用，应立即处置
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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。
已观察到在野利用
cisa_kev · confirmed
可能的 ATT&CK 技术 1 AI
T1203 · Exploitation for Client Execution影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| 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 条更多 | |||
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一、 漏洞 CVE-2026-53362 基础信息
漏洞信息
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Vulnerability Title
ipv6: account for fraggap on the paged allocation path
来源: 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.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-53362 的公开POC
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CVE-2026-53362 补丁与修复 (6)
同批安全公告 · Linux · 2026-07-04 · 共 4 条
| CVE-2026-53360 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53359 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-53361 | 7.1 HIGH | Linux kernel 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-53362
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