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CVE-2026-74560— 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 6.6版本存在安全漏洞，该漏洞源于xsk_drop_skb()函数在处理AF_XDP多缓冲传输时存在缓冲区泄漏，导致CQ地址发布错误，用户空间永久丢失缓冲区。

AI 预测 5.3 利用难度: 中等 EPSS 0.21% · P10

影响版本矩阵 8

厂商产品 版本范围状态
Linux Linux cf24f5a5feeaae34c1a34d1e04f8ac697290427a< 05e283466b86e0b25a5209a3eafe87aa9886064a affected
cf24f5a5feeaae34c1a34d1e04f8ac697290427a< a0528ab6af62bf57153caaf8ea28e5fcb0e18fd4 affected
cf24f5a5feeaae34c1a34d1e04f8ac697290427a< a3c8382ebce4780c6b3ace2c09bc342313ac0186 affected
6.6 affected
< 6.6 unaffected
6.18.44≤ 6.18.* unaffected
7.1.8≤ 7.1.* unaffected
7.2≤ * unaffected
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一、 漏洞 CVE-2026-74560 基础信息

漏洞信息
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Vulnerability Title
xsk: fix buffer leak in xsk_drop_skb() for AF_XDP multi-buffer Tx
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xsk: fix buffer leak in xsk_drop_skb() for AF_XDP multi-buffer Tx This patch is inspired by the check[1] from sashiko. It says when overflow happens, the address of cq to be published is invalid. Actually the severer thing is the whole process of publishing the address of cq in this particular case is not right: it should truely publish the address and advance the cached_prod in cq as long as it reads descriptors from txq. The following is the full analysis. xsk_drop_skb() is called in three places, which all discard a partially built multi-buffer skb: 1) xsk_build_skb() -EOVERFLOW error path: packet exceeds MAX_SKB_FRAGS 2) __xsk_generic_xmit() post-loop cleanup: an invalid descriptor in the TX ring prevents the partial packet from completing 3) xsk_release(): socket close while xs->skb holds an incomplete packet In all three cases, the TX descriptors for the already-processed frags have been consumed from the TX ring (xskq_cons_release), and CQ slots have been reserved. However, xsk_drop_skb() calls xsk_consume_skb() which cancels the CQ reservations via xsk_cq_cancel_locked(). Since the buffer addresses never appear in the completion queue, userspace permanently loses track of these buffers. Fix this by letting consume_skb() trigger the existing xsk_destruct_skb destructor, which already submits buffer addresses to the CQ via xsk_cq_submit_addr_locked(). Note that cancelling the descriptors back to the TX ring (via xskq_cons_cancel_n) is not a appropriate option because an oversized packet that always exceeds MAX_SKB_FRAGS would be retried indefinitely, which is an obviously deadlock bug in the TX path. Also move the desc->addr assignment in xsk_build_skb() above the overflow check so that the current descriptor's address is recorded before a potential -EOVERFLOW jump to free_err, consistent with the zerocopy path in xsk_build_skb_zerocopy(). [1]: https://lore.kernel.org/all/20260425041726.85FB3C2BCB2@smtp.kernel.org/
来源: CVE Program / CVE List V5
CVSS Information
N/A
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 6.6版本存在安全漏洞，该漏洞源于xsk_drop_skb()函数在处理AF_XDP多缓冲传输时存在缓冲区泄漏，导致CQ地址发布错误，用户空间永久丢失缓冲区。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux cf24f5a5feeaae34c1a34d1e04f8ac697290427a ~ 05e283466b86e0b25a5209a3eafe87aa9886064a -
Linux Linux 6.6 -

二、漏洞 CVE-2026-74560 的公开POC

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三、漏洞 CVE-2026-74560 的情报信息

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CVE-2026-74560 补丁与修复 (2)

同批安全公告 · Linux · 2026-08-15 · 共 844 条

CVE-2026-74280 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-74279 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-74475 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-72421 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-74309 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-72407 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-72408 10.0 CRITICAL Linux kernel 安全漏洞
CVE-2026-72493 9.9 CRITICAL Linux kernel 安全漏洞
CVE-2026-72319 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72220 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72217 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-74384 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72299 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72210 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72211 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72317 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72209 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-74268 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-72207 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-74267 9.8 CRITICAL Linux kernel 安全漏洞

显示前 20 条，共 844 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74560

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