CVE-2026-63978— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
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 6.4版本存在安全漏洞，该漏洞源于网络握手模块在退出命名空间时对list_splice_init函数参数传递顺序错误，导致待处理的握手请求未正确清理，攻击者可能利用此漏洞造成资源泄漏或列表损坏。
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 3b3009ea8abb713b022d94fba95ec270cf6e7eae< 9ec20c9a5a04f2c3f1cf65d21f886d7aaa6189cd |
affected |
3b3009ea8abb713b022d94fba95ec270cf6e7eae< 2bf24a7e190aae0ea47c78099938ae056c622e44 |
affected | ||
3b3009ea8abb713b022d94fba95ec270cf6e7eae< 8c35539db0ab0bfa1ea44efab00b053261a69469 |
affected | ||
3b3009ea8abb713b022d94fba95ec270cf6e7eae< ea5fe6a73ca57e5150b8a38b341aef2636eb72f0 |
affected | ||
6.4 |
affected | ||
< 6.4 |
unaffected | ||
6.12.93≤ 6.12.* |
unaffected | ||
6.18.44≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-63978 基础信息
漏洞信息
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Vulnerability Title
net/handshake: Drain pending requests at net namespace exit
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/handshake: Drain pending requests at net namespace exit
The arguments to list_splice_init() in handshake_net_exit() are
reversed. The call moves the local empty "requests" list onto
hn->hn_requests, leaving the local list empty, so the subsequent
drain loop runs zero iterations. Pending handshake requests that
had not yet been accepted are not torn down when the net namespace
is destroyed; each one keeps a reference on a socket file and on
the handshake_req allocation.
Pass the source and destination in the documented order
(list_splice_init(list, head) moves list onto head) so the pending
list is transferred to the local scratch list and drained through
handshake_complete().
Fixing the splice direction exposes a list-corruption race. After
the splice each req->hr_list still has non-empty link pointers,
threading the stack-local scratch list rather than hn_requests.
A concurrent handshake_req_cancel() -- for example, from sunrpc's
TLS timeout on a kernel socket whose netns reference was not
taken -- finds the request through the rhashtable, calls
remove_pending(), and sees !list_empty(&req->hr_list).
__remove_pending_locked() then list_del_init()s an entry off the
scratch list while the drain iterates, corrupting it. The same
call arriving after the drain loop has run list_del() on an
entry hits LIST_POISON instead.
Have remove_pending() check HANDSHAKE_F_NET_DRAINING under
hn_lock and report not-found when drain is in progress. The
drain has already taken ownership; handshake_complete()'s existing
test_and_set on HANDSHAKE_F_REQ_COMPLETED still arbitrates
between drain and cancel for who calls the consumer's hp_done. Use
list_del_init() rather than list_del() in the drain so req->hr_list
does not carry LIST_POISON after drain releases the entry.
The DRAINING guard in remove_pending() makes cancel return false,
but cancel still falls through to test_and_set_bit on
HANDSHAKE_F_REQ_COMPLETED and drops the request's hr_file reference.
Without another pin, if that is the last reference, sk_destruct frees
the request while it is still linked on the drain loop's local list.
Pin each request's hr_file under hn_lock before releasing the list,
and drop that drain pin after the loop finishes with the request.
来源: 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
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 6.4版本存在安全漏洞，该漏洞源于网络握手模块在退出命名空间时对list_splice_init函数参数传递顺序错误，导致待处理的握手请求未正确清理，攻击者可能利用此漏洞造成资源泄漏或列表损坏。
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-2026-63978 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-63978 补丁与修复 (4)
同批安全公告 · Linux · 2026-07-19 · 共 429 条
| CVE-2026-63795 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64136 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63993 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53399 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53398 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64089 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64091 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64113 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64055 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63924 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63984 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63800 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64037 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63888 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63887 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64056 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64061 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64125 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64102 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-63825 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 429 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-63978
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