CVE-2026-97952— sunvdc: unmap LDC cookies when the descriptor send fails
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： sunvdc：在描述符发送失败时取消映射 LDC cookies 函数会将请求的页面映射到 LDC（逻辑域通道）通道的映射表（通过 ），填充描述符，并在通过 触发门铃之前将其标记为 。当触发失败时，错误处理路径仅打印一条消息，而描述符仍保持 状态，且 cookies 永远不会被取消映射。 通常情况下，当对端完成描述符时，映射会在 中释放——但从未发送门铃的描述符永远不会被完成；此外，由于失败时未推进 ，重置路径（ ，遍历区间 ）也不会访问该描述符。因此，映射表条目会永久泄漏
Possible ATT&CK Techniques 1 AI
T1499.004 · Application or System ExploitationAffected Version Matrix 28
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< eb9c5f6747fe98b83c78cb5476a914e91d50e8e8 |
affected |
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 24564576be423f3b5d7e67cd7df848ac66646497 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 9251573e7cf7d797ae4a30b2a236af8242237a61 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< b0de6463667e9bb9dc14a83a9c24c1b6b3f7b5f7 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< ab81a5c1014a38dab0fb402609fd866b0bcb4726 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 57835952566f0be9b365a6eb3a70b397a9d5ef47 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< f3322baa3a8ac87730feae952c1146269d78e098 |
affected | ||
a11f6ca9aef989b56cd31ff4ee2af4fb31a172ec< 0c6da21fa35e03fc74f09895433ccd6d4a9c3530 |
affected | ||
| … +20 more rows | |||
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I. Basic Information for CVE-2026-97952
Vulnerability Information
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Vulnerability Title
sunvdc: unmap LDC cookies when the descriptor send fails
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
sunvdc: unmap LDC cookies when the descriptor send fails
__send_request() maps the request's pages into the LDC channel's map
table (ldc_map_sg()), fills in the descriptor and marks it
VIO_DESC_READY before ringing the doorbell via __vdc_tx_trigger().
When the trigger fails, the error path only prints a message: the
descriptor stays READY and the cookies are never unmapped. The
mapping is normally released in vdc_end_one() when the peer completes
the descriptor - but a descriptor whose doorbell was never sent will
never complete, and since dr->prod is not advanced on failure, the
reset path (vdc_requeue_inflight(), which walks [cons, prod)) never
visits it either. The map table entries are leaked permanently.
Since commit a11f6ca9aef9 ("sunvdc: Do not spin in an infinite loop
when vio_ldc_send() returns EAGAIN") trigger failures occur in
practice under load, so every resulting I/O error also leaks one
request's worth of entries from the fixed-size (8192 entries per
channel) map table. Because the allocator hands out contiguous
ranges, fragmentation makes large multi-segment requests fail first
as the table drains, until ldc_map_sg() fails permanently and the
disk is dead until reboot.
It also makes any retry-based recovery unusable: requeuing the
request on -EAGAIN remaps the pages on every attempt, overwriting
desc->cookies and orphaning the previous mapping, so the table
drains at the retry rate. This is the memory exhaustion observed
when the requeue approach was first tested in October 2025.
Roll back on failure: unmap the cookies, mark the descriptor FREE
again and clear the request entry. If the trigger failed with
-ENOTCONN, __vdc_tx_trigger() has already reset the port, which
tears down and reallocates both the dring and the LDC channel
including its map table - nothing to roll back, and the stale
descriptor must not be touched.
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
II. Public POCs for CVE-2026-97952
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-97952 (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-2026-98112 | 7.8 HIGH | ksmbd: fix listener task lifetime on netdev events |
| CVE-2026-98002 | 7.8 HIGH | iommu/amd: Fix ineffective error check in nested domain allocation |
| 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 → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-98384
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CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
Same vendor: Linux
-
CVE-2026-98384
bpf: Fix out-of-bounds read of sk_protocol in bpf_sock_destr -
CVE-2026-98383
bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL -
CVE-2026-98382
bpf: Reject dev-bound-only programs on other devices -
CVE-2026-98381
veth: manage XDP program pointers during channel resize -
CVE-2026-98380
net/sched: reject IDR error pointers when deleting actions
V. Comments for CVE-2026-97952
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