CVE-2026-72466— 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基金会开源的一个操作系统内核。 Linux kernel 4.14版本存在安全漏洞，该漏洞源于xprtrdma模块的rpcrdma_is_bcall()函数在解码回复数据包时未检查缓冲区结束边界，导致越界读取，且短头部处理分支未调用rpcrdma_bc_receive_call()，造成接收缓冲区泄漏并耗尽接收队列，可能导致拒绝服务。
影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 41c8f70f5a3db7e06179186b6525fd9ee1d7d314< 0cee8f9c3b14bd6dee9c4310090a7f45b89b834f |
affected |
41c8f70f5a3db7e06179186b6525fd9ee1d7d314< 7afc2f8d2fd9394724df9eaf22ce7a71029a5fba |
affected | ||
41c8f70f5a3db7e06179186b6525fd9ee1d7d314< 88b5346284a184a6b7d019912232a571d672d3e3 |
affected | ||
41c8f70f5a3db7e06179186b6525fd9ee1d7d314< 07aa506436be7634e381e1e1f6d0efa9efc81ecc |
affected | ||
41c8f70f5a3db7e06179186b6525fd9ee1d7d314< d7a2870dde3bb09d51d6b9c877642996ad6b92dd |
affected | ||
41c8f70f5a3db7e06179186b6525fd9ee1d7d314< 118a16a18c59f7ad8084b2d13988839b669fca10 |
affected | ||
41c8f70f5a3db7e06179186b6525fd9ee1d7d314< c7653d5cebc8492c77ec0415b5e9c0fb3e644bc6 |
affected | ||
4.14 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2026-72466 基础信息
漏洞信息
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Vulnerability Title
xprtrdma: Fix bcall rep leak and unbounded peek
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xprtrdma: Fix bcall rep leak and unbounded peek
rpcrdma_is_bcall() decodes a reply's first words to decide whether
the frame is a backchannel call. Two issues in that decode path
let a short or malformed reply leak the receive buffer and drain
the Receive queue.
First, the speculative peek
p = xdr_inline_decode(xdr, 0);
/* five p++ reads follow */
asks xdr_inline_decode() for zero bytes, which returns xdr->p
without consulting xdr->end. The five subsequent __be32 reads can
then walk up to 20 bytes past the wire payload into stale regbuf
contents and misclassify the reply as a backchannel call.
Second, after the post-peek
p = xdr_inline_decode(xdr, 3 * sizeof(*p));
if (unlikely(!p))
return true;
the short-header arm returns true without calling
rpcrdma_bc_receive_call(). The contract with the caller is that a
true return transfers ownership of rep to the backchannel path:
rpcrdma_reply_handler()
if (rpcrdma_is_bcall(r_xprt, rep))
return; /* bare return, skips out_post */
...
out_post:
rpcrdma_post_recvs(r_xprt, credits + ...);
Because rpcrdma_bc_receive_call() never ran, no one took rep, but
rpcrdma_reply_handler still bare-returns past rpcrdma_rep_put()
and rpcrdma_post_recvs(). The rep, with its persistently
DMA-mapped receive buffer, is orphaned on rb_all_reps and freed
only at transport teardown. This completion reposts nothing, so
its slot is reclaimed only when a later forward-channel reply
reaches out_post and rpcrdma_post_recvs() allocates a fresh rep to
backfill; absent that traffic the Receive queue drains and the
peer's Sends draw RNR NAKs.
Fix by consulting xdr->end after the zero-length peek so the five
__be32 reads cannot run unless 20 bytes of wire payload remain. A
byte-precise comparison against xdr->end is required because a
non-4-aligned receive rounds the stream's word count up past the
true payload. Also return false from the short-header arm so the
reply falls through the normal out_norqst cleanup chain
(rpcrdma_rep_put() plus rpcrdma_post_recvs()).
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基金会开源的一个操作系统内核。 Linux kernel 4.14版本存在安全漏洞，该漏洞源于xprtrdma模块的rpcrdma_is_bcall()函数在解码回复数据包时未检查缓冲区结束边界，导致越界读取，且短头部处理分支未调用rpcrdma_bc_receive_call()，造成接收缓冲区泄漏并耗尽接收队列，可能导致拒绝服务。
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-2026-72466 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-72466 补丁与修复 (7)
同批安全公告 · Linux · 2026-08-15 · 共 844 条
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72084 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74480 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72083 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74345 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72248 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72249 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74493 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74495 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72251 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74398 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74401 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72317 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 844 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-72466
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