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CVE-2026-98116— ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF

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，以下漏洞已被修复： ALSA: pcm: 串行化 PCM mmap 与缓冲区重分配，以修复页级使用-after-free（Use-After-Free）漏洞 和 在 PCM 流锁保护下通过检查 来守卫缓冲区的重分配操作。然而，该锁在缓冲区实际被释放之前很早就被释放了： 、约束细化（constraint refinement）以及 等操作均发生在锁释放之后、缓冲区真正释放之前。 另一方面， 函数完全不加锁：它基于旧缓冲区的状态和 进行校验，将其页重新映射到 VMA（虚拟内存区域），然后才递增

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 92ee3c60ec9fe64404dc035e7c41277d74aa26cb< cbc7ec97601d09b74e05e44470fa6b0bcdabf3f5 affected
92ee3c60ec9fe64404dc035e7c41277d74aa26cb< fd137bf8149bc6460f9b7b1fc292025da04cb9ee affected
92ee3c60ec9fe64404dc035e7c41277d74aa26cb< 8c1882dfee8f404d118020664b73eb4592172226 affected
92ee3c60ec9fe64404dc035e7c41277d74aa26cb< 9b110a9dcecc59516c77cb3c0caf1f492f75df2d affected
a42aa926843acca96c0dfbde2e835b8137f2f092 affected
9cb6c40a6ebe4a0cfc9d6a181958211682cffea9 affected
fbeb492694ce0441053de57699e1e2b7bc148a69 affected
0f6947f5f5208f6ebd4d76a82a4757e2839a23f8 affected
… +16 more rows
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I. Basic Information for CVE-2026-98116

Vulnerability Information
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Vulnerability Title
ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF snd_pcm_hw_params() and snd_pcm_hw_free() guard buffer reallocation with an mmap_count check performed under the PCM stream lock, but the lock is released long before the buffer is actually freed: snd_pcm_sync_stop(), constraint refinement and do_free_pages() all happen in between. snd_pcm_mmap_data(), on the other hand, takes no lock at all: it validates against the old buffer's state and dma_bytes, remaps its pages into the VMA, and only then increments mmap_count. A concurrent mmap() can therefore slip in between the check and the free. remap_pfn_range() installs writable PTEs for the old buffer's pages without taking page references, and the subsequent do_free_pages() returns those pages to the page allocator while the VMA still maps them. This leaves a stale, writable mapping of freed pages: a page-level use-after-free that can be leveraged for local privilege escalation. Make snd_pcm_mmap_data() participate in the buffer-access scheme introduced for hw_params/hw_free: acquire runtime->buffer_accessing before validating and remapping, and release it afterwards. Buffer reallocation already fails with -EBUSY while accessors are active, and the mmap side now fails with -EBUSY while a reallocation is in progress, so the validate/remap sequence and the check/free sequence can no longer interleave. A reproducer that turns this race into a stale writable mapping of the freed DMA buffer pages is available on request.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 92ee3c60ec9fe64404dc035e7c41277d74aa26cb ~ cbc7ec97601d09b74e05e44470fa6b0bcdabf3f5 -
Linux Linux 5.18 -

II. Public POCs for CVE-2026-98116

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III. Intelligence Information for CVE-2026-98116

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Patches & Fixes for CVE-2026-98116 (4)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-98122 7.8 HIGH vxlan: mdb: Fix use-after-free in vxlan_mdb_remote_src_del()
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-97991 7.8 HIGH vdpa_sim_blk: reject out-of-range sector starts
CVE-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98116

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