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CVE-2026-99028— net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop

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: xilinx: axienet：在 dmaengine 停止时释放未完成的 DMA 缓冲区在 dmaengine 路径中，该驱动程序会预先提交接收（RX）缓冲区，并保留正在传输中的发送（TX）缓冲区；这些缓冲区对应的 SKB（套接字缓冲区）由驱动程序进行 DMA 映射，且仅在完成回调中释放。当调用时，会中止这些描述符，但不会执行其回调函数。随后，驱动程序仅释放环形缓冲区的“外壳”，导致每个操作都会泄漏仍由 dmaengine 拥有且已进行 DMA 映射

AI Predicted 7.8 Difficulty: Hard EPSS 0.17% · P6 Updated Oct 23, 2026

Possible ATT&CK Techniques 2 AI

T1070.001 T1069.004

Affected Version Matrix 10

Vendor	Product	Version Range	Status
Linux	Linux	`6a91b846af85a24241decd686269e8e038eb13d1< 079396129da5e7cb40ca0920aa1b9525bef6097c`	affected
		`6a91b846af85a24241decd686269e8e038eb13d1< eececf7c3a679d9c08175ad6bacbc8c31848f5af`	affected
		`6a91b846af85a24241decd686269e8e038eb13d1< 5e5cf3ad7c099ff86ea9e422cddb25a2e5317b58`	affected
		`6a91b846af85a24241decd686269e8e038eb13d1< bcf2573a68a808a5b54cadafa72b6672e662c2bf`	affected
		`6.8`	affected
		`< 6.8`	unaffected
		`6.12.114≤ 6.12.*`	unaffected
		`6.18.58≤ 6.18.*`	unaffected
… +2 more rows

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Vulnerability Information

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Vulnerability Title

net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop In the dmaengine path the driver pre-submits RX buffers and holds in-flight TX buffers whose SKBs are DMA-mapped by the driver and freed only in the completion callbacks. On ndo_stop() dmaengine_terminate_sync() aborts these descriptors without running their callbacks, and the driver then frees only the ring shells, leaking every SKB still owned by the engine and its DMA mapping on each ifdown. With 128 RX buffers pre-posted per channel, the mapping leak can eventually exhaust a limited IOMMU aperture. Clear the slot's skb in the TX and RX callbacks so a non-NULL skb marks a slot that still owns a live, DMA-mapped buffer, and on stop unmap and free every such buffer. axienet_dma_rx_cb() runs from the DMA tasklet and re-arms the RX ring on each completion, so it can race axienet_stop(): a completion may submit a fresh buffer after dmaengine_terminate_sync() has returned, leaving the channel armed with a buffer the teardown then frees while the engine may still write into it (dma_release_channel() does not stop it either). Add a lock that axienet_dma_rx_cb() holds across the @stopping check and the resubmit, and axienet_stop() holds to set @stopping before terminating. Once @stopping is set no callback can arm a new buffer, and any armed just before is aborted by the terminate, so teardown only frees buffers the engine no longer owns.

Source: CVE Program / CVE List V5

CVSS Information

N/A

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	6a91b846af85a24241decd686269e8e038eb13d1 ~ 079396129da5e7cb40ca0920aa1b9525bef6097c	-
Linux	Linux	6.8	-

II. Public POCs for CVE-2026-99028

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99028

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Patches & Fixes for CVE-2026-99028 (4)

https://www.cve.org/CVERecord?id=CVE-2026-99028

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-2026-98899	7.8 HIGH	netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99018	7.8 HIGH	riscv: entry: gate shadow call stack reload on sstatus.SPP, not tp
CVE-2026-99002	7.8 HIGH	drm/vmwgfx: validate pitch coming from userspace
CVE-2026-99016	7.8 HIGH	riscv: futex: untag the user pointer before the atomic access
CVE-2026-99051	7.8 HIGH	fsverity: RCU-delay the freeing of struct fsverity_info
CVE-2026-99032	7.8 HIGH	net/smc: protect clcsock lifetime in smc_getname
CVE-2026-98999	7.8 HIGH	drm/xe: Fix stale pinned_link entry when fb-pin performs the final unpin

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

IV. Related Vulnerabilities

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