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CVE-2026-99030— net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits()

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： net: skbuff: 避免在 skb_copy_and_csum_bits() 中遗留旧字节当 skb_copy_and_csum_bits() 遇到无法读取的碎片（frags）时，它会在仅复制线性部分后返回 0，而调用方缓冲区的其余部分则保持原样。调用方将数据复制到一个即将发送的缓冲区中：例如，用于引用问题数据包的 ICMP 错误消息，或 skb_copy_and_csum_dev() 中驱动程序的 TX 回弹缓冲区（bounce buffer）。这些缓冲区在写

CVSS 7.5 · High EPSS 0.46% · P39 Updated Oct 24, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 10

Vendor	Product	Version Range	Status
Linux	Linux	`65249feb6b3df9e17bab5911ee56fa7b0971e231< 5f19b9cfff79508e8cb09be40d014cb0807f3854`	affected
		`65249feb6b3df9e17bab5911ee56fa7b0971e231< 5551399751e2c9f31e4f3428040985a07e79d9c2`	affected
		`65249feb6b3df9e17bab5911ee56fa7b0971e231< 39d1a6b601831237c6038b5e3ac8dbb883c1700a`	affected
		`65249feb6b3df9e17bab5911ee56fa7b0971e231< ab9414ed70bd783e902a85c350620dee269bcb2b`	affected
		`6.12`	affected
		`< 6.12`	unaffected
		`6.12.113≤ 6.12.*`	unaffected
		`6.18.57≤ 6.18.*`	unaffected
… +2 more rows

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Vulnerability Information

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Vulnerability Title

net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits()

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending packet, or a driver's TX bounce buffer in skb_copy_and_csum_dev(). Neither buffer is zeroed beforehand, so whatever was in memory there gets sent. Zero the part of the buffer we didn't fill. The checksum usually won't match the data any more, so the receiver will usually drop the packet, but either way it no longer carries anything it shouldn't. Only zero for a positive @len, a negative one from a broken caller must not turn into a huge memset().

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	65249feb6b3df9e17bab5911ee56fa7b0971e231 ~ 5f19b9cfff79508e8cb09be40d014cb0807f3854	-
Linux	Linux	6.12	-

II. Public POCs for CVE-2026-99030

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-99030

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Patches & Fixes for CVE-2026-99030 (4)

https://www.cve.org/CVERecord?id=CVE-2026-99030

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959	9.8 CRITICAL	btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078	9.8 CRITICAL	net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079	9.8 CRITICAL	net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988	8.8 HIGH	namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083	8.8 HIGH	ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082	8.8 HIGH	KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98870	8.8 HIGH	ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980	8.8 HIGH	namei: don't reveal overmounted entries in refwalk
CVE-2026-98981	8.8 HIGH	namespace: unhash a dentry before detaching the mounts on it
CVE-2026-99042	8.4 HIGH	io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978	8.4 HIGH	namespace: never expire a locked mount
CVE-2026-99064	8.1 HIGH	cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968	8.1 HIGH	amt: send the relay's General Query directly from the receive path
CVE-2026-99016	7.8 HIGH	riscv: futex: untag the user pointer before the atomic access
CVE-2026-99012	7.8 HIGH	Bluetooth: ISO: Serialize concurrent connect calls
CVE-2026-99002	7.8 HIGH	drm/vmwgfx: validate pitch coming from userspace
CVE-2026-98899	7.8 HIGH	netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99006	7.8 HIGH	drm/i915/gem: Prevent overstepping exec array boundary
CVE-2026-98999	7.8 HIGH	drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin
CVE-2026-99032	7.8 HIGH	net/smc: protect clcsock lifetime in smc_getname

Showing top 20 of 217 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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