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CVE-2026-97993— vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx

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，已修复以下漏洞： vhost-vdpa：不要在 config_ctx 中安装 eventfd_ctx_fdget() 返回的错误值 函数在检查返回值之前，就将 的返回值交换到了 中。因此，当发生错误时，该字段会短暂地持有一个 错误指针： 提交 （“vhost-vdpa：如果 eventfd_ctx_fdget() 失败则将 v->config_ctx 设置为 NULL”）添加了上述清理操作，并明确了文件其余部分所依赖的不变式：“如果 v->config_ctx 不为 NULL，则认为其有效”

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 776f395004d829bbbf18c159ed9beb517a208c71< e260dc9fbfdae0978e7a8698f977fbb463a657be affected
776f395004d829bbbf18c159ed9beb517a208c71< 66e73fa18910b39fea0941dea5fe091122240855 affected
776f395004d829bbbf18c159ed9beb517a208c71< 4fde085eb839fbb39c25cbba5d2a091ded394877 affected
776f395004d829bbbf18c159ed9beb517a208c71< 59fc7c1c6b4d325194ca45352180340092d95098 affected
776f395004d829bbbf18c159ed9beb517a208c71< 388c678639a0cebfd936b3e56c64ac6a371efec2 affected
776f395004d829bbbf18c159ed9beb517a208c71< 65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a affected
776f395004d829bbbf18c159ed9beb517a208c71< 6b20b40f020bde236f6b8a08ff88d8653261ec2b affected
776f395004d829bbbf18c159ed9beb517a208c71< e74a9fa50749b9940b4fb13199652325e08d3c4a affected
… +10 more rows
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I. Basic Information for CVE-2026-97993

Vulnerability Information
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Vulnerability Title
vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vhost-vdpa: don't install the eventfd_ctx_fdget() error in config_ctx vhost_vdpa_set_config_call() swaps the eventfd_ctx_fdget() return value into v->config_ctx before checking it, so on failure the field briefly holds an ERR_PTR: ctx = fd == VHOST_FILE_UNBIND ? NULL : eventfd_ctx_fdget(fd); swap(ctx, v->config_ctx); if (!IS_ERR_OR_NULL(ctx)) eventfd_ctx_put(ctx); if (IS_ERR(v->config_ctx)) { long ret = PTR_ERR(v->config_ctx); v->config_ctx = NULL; return ret; } Commit 0bde59c1723a ("vhost-vdpa: set v->config_ctx to NULL if eventfd_ctx_fdget() fails") added that clearing, and spelled out the invariant the rest of the file relies on: "we consider 'v->config_ctx' valid if it is not NULL". The window between the swap and the clearing still breaks it. vhost_vdpa_config_cb() only tests for NULL, so a config interrupt delivered inside the window hands the ERR_PTR to eventfd_signal(). Check the fd before installing it instead. That closes the window and matches how vhost_vring_ioctl() handles the same failure for the vq call fd. It also stops a rejected fd from tearing down a config interrupt that was working: until now the swap replaced the live context and put it, so after an EBADF the device silently stopped delivering config interrupts until userspace installed a new fd.
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 776f395004d829bbbf18c159ed9beb517a208c71 ~ e260dc9fbfdae0978e7a8698f977fbb463a657be -
Linux Linux 5.8 -

II. Public POCs for CVE-2026-97993

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III. Intelligence Information for CVE-2026-97993

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Patches & Fixes for CVE-2026-97993 (8)

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-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
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-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
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-2026-97570 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-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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