CVE-2026-80841— 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存在安全漏洞，该漏洞源于net/packet子系统的AF_PACKET TX_RING在释放vmalloc映射时处理不当，可能导致释放后重用。
可能的 ATT&CK 技术 1 AI
T1081影响版本矩阵 14
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b013840810c221f2b0cf641d01531526052dc1fb< debf9f50140b3df3949ebcb97d4450f8993fe32d |
affected |
b013840810c221f2b0cf641d01531526052dc1fb< 4ce6e2d2e38055b2012bd5fdb0c8a8183c8a1b0c |
affected | ||
b013840810c221f2b0cf641d01531526052dc1fb< ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b |
affected | ||
b013840810c221f2b0cf641d01531526052dc1fb< 0189dce07db2dc059ae0570e06758ec4233c6e11 |
affected | ||
b013840810c221f2b0cf641d01531526052dc1fb< 550d00aa58193fb649a09a9c9e338c685adad784 |
affected | ||
b013840810c221f2b0cf641d01531526052dc1fb< 992cc9f94ca924089a506ba9b327caa9af797529 |
affected | ||
3.14 |
affected | ||
< 3.14 |
unaffected | ||
| … +6 条更多 | |||
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一、 漏洞 CVE-2026-80841 基础信息
漏洞信息
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Vulnerability Title
net/packet: defer vmalloc TX_RING free until skbs finish
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net/packet: defer vmalloc TX_RING free until skbs finish
AF_PACKET TX_RING skbs keep a raw pointer to their ring frame. The skb
page references preserve page-backed ring blocks after pg_vec is freed,
but they do not preserve a vmalloc mapping.
tpacket_destruct_skb() currently drops the pending reference before
writing the timestamp and TP_STATUS_AVAILABLE to the frame. Move the
decrement after those stores. The smp_wmb() in __packet_set_status()
orders the frame stores before the decrement.
Also recheck pending TX frames under pg_vec_lock before non-closing
ring replacement, so a racing send cannot add a pending skb between
the initial check and the ring swap.
Ring allocation can produce a mixture of page-backed and vmalloc-backed
blocks. Allocate deferred-work storage during TX ring setup when the
first vmalloc-backed block is encountered, and keep its pointer in the
pg_vec allocation header. If allocation fails, return -ENOMEM from ring
setup. On socket close, a non-NULL pointer identifies a vmalloc-backed
vector without a scan. If TX skbs remain, defer the whole vector to
system_long_wq.
After pg_vec is detached, a late destructor can skip the pending
decrement. Use socket write-memory accounting as the deferred lifetime
gate instead: an skb remains charged through its final sock_wfree(),
after all ring-frame accesses. The delayed work retains a socket
reference and reschedules itself until no TX skbs remain.
Move pending_refcnt release to packet_sock_destruct() so late skb
destructors and deferred cleanup can safely use it after
packet_release(). Page-backed teardown remains synchronous, and no lock
is added to the TX completion hot path.
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存在安全漏洞，该漏洞源于net/packet子系统的AF_PACKET TX_RING在释放vmalloc映射时处理不当，可能导致释放后重用。
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-2026-80841 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-80841 补丁与修复 (5)
CVE-2026-80841 其他参考 (1)
同批安全公告 · Linux · 2026-09-04 · 共 156 条
| CVE-2026-80865 | Linux kernel 安全漏洞 | |
| CVE-2026-80856 | Linux kernel 安全漏洞 | |
| CVE-2026-80857 | Linux kernel 安全漏洞 | |
| CVE-2026-80858 | Linux kernel 安全漏洞 | |
| CVE-2026-80859 | Linux kernel 安全漏洞 | |
| CVE-2026-80860 | Linux kernel 安全漏洞 | |
| CVE-2026-80861 | Linux kernel 安全漏洞 | |
| CVE-2026-80862 | Linux kernel 安全漏洞 | |
| CVE-2026-80863 | Linux kernel 安全漏洞 | |
| CVE-2026-80864 | Linux kernel 安全漏洞 | |
| CVE-2026-80870 | Linux kernel 安全漏洞 | |
| CVE-2026-80874 | Linux kernel 安全漏洞 | |
| CVE-2026-80873 | Linux kernel 安全漏洞 | |
| CVE-2026-80872 | Linux kernel 安全漏洞 | |
| CVE-2026-80871 | Linux kernel 安全漏洞 | |
| CVE-2026-80868 | Linux kernel 安全漏洞 | |
| CVE-2026-80866 | Linux kernel 安全漏洞 | |
| CVE-2026-80867 | Linux kernel 安全漏洞 | |
| CVE-2026-80855 | Linux kernel 安全漏洞 | |
| CVE-2026-80869 | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-80841
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