CVE-2026-74702— vhost-scsi: reject feature changes after endpoint
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-scsi：在 endpoint（端点）激活后拒绝更改特性（features） 函数在 操作时运行，并根据已确认的 位为每个命令分配保护散列列表数组（ ）。当后续通过 更改该位时，命令池并未重新构建。 尽管 virtio 特性位不应在特性协商后发生改变，但 当前在端点处于活动状态时仍会接受此类请求，并更新 。因此，在端点设置完成后启用 T10-PI 会导致 为 NULL，而 I/O 路径却遵循新的特性位。 对于一个包含 129 页保护负载的情况， 会将缺失的第一个
Possible ATT&CK Techniques 2 AI
T1499 · Endpoint Denial of Service T1203 · Exploitation for Client ExecutionAffected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | bf2d650391be508dd8b5e188b65ed32300cf3489< a06e4611d45518896fbff4f45d9581578b107e91 |
affected |
bf2d650391be508dd8b5e188b65ed32300cf3489< 9a3eb77a612f9d158e4d27df43677a014e9cfa55 |
affected | ||
bf2d650391be508dd8b5e188b65ed32300cf3489< 42bc45df5905e2b7dccb72adaf7730f66cfbe03f |
affected | ||
6.15 |
affected | ||
< 6.15 |
unaffected | ||
6.18.45≤ 6.18.* |
unaffected | ||
7.1.9≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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I. Basic Information for CVE-2026-74702
Vulnerability Information
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Vulnerability Title
vhost-scsi: reject feature changes after endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
vhost-scsi: reject feature changes after endpoint
vhost_scsi_setup_vq_cmds() runs from VHOST_SCSI_SET_ENDPOINT and allocates
each command's protection scatterlist array (prot_sgl) according to the
acknowledged VIRTIO_SCSI_F_T10_PI bit. The command pools are not rebuilt
when VHOST_SET_FEATURES changes that bit later.
Although virtio feature bits must not change after feature negotiation,
vhost_scsi_set_features() currently accepts such a request after the
endpoint is active and updates acked_features. Enabling T10-PI after
endpoint setup therefore leaves prot_sgl NULL while the I/O path follows
the new feature bit.
For a 129-page protection payload, vhost_scsi_mapal() passes the missing
first chunk to sg_alloc_table_chained():
sg_alloc_table_chained(table, 129, first_chunk=NULL,
nents_first_chunk=inline_sg_cnt)
sg_pool_index() then hits:
BUG_ON(nents > SG_CHUNK_SIZE); /* 129 > 128 */
The kernel reported the following call trace and register state:
Call Trace:
<TASK>
? __sg_alloc_table+0x1d8/0x250
? __pfx_vhost_run_work_list+0x10/0x10 [vhost]
sg_alloc_table_chained+0x59/0xf0
? __pfx_sg_pool_alloc+0x10/0x10
? vhost_scsi_calc_sgls.constprop.0+0x43/0x60 [vhost_scsi]
vhost_scsi_handle_vq+0xf02/0x1700 [vhost_scsi]
? __pfx_vhost_scsi_handle_vq+0x10/0x10 [vhost_scsi]
vhost_scsi_handle_kick+0x37/0x50 [vhost_scsi]
vhost_run_work_list+0x8e/0xd0 [vhost]
vhost_task_fn+0xe1/0x210
ret_from_fork+0x348/0x540
</TASK>
RIP: 0010:0x4
CR2 = 0x4
RSP: 0018:ffffc90000dbf940 EFLAGS: 00010202
RAX: ffffffff82396810 RBX: ffff88811dc28b80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000820 RDI: 0000000000000081
VHOST_F_LOG_ALL is a vhost-specific runtime feature and remains the only
exception.
Reject changes to any feature other than VHOST_F_LOG_ALL while the
endpoint is active. This preserves the existing runtime log toggle while
preventing feature-dependent command resources and data-path state from
becoming inconsistent. Userspace must clear the endpoint before changing
any other negotiated feature and set the endpoint up again afterward.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-74702
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-74702 (3)
Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total
| CVE-2026-74705 | 10.0 CRITICAL | udp: fix potential use-after-free in tunnel segmentation |
| CVE-2026-74612 | 10.0 CRITICAL | veth: fix skb length accounting after XDP frag adjustment |
| CVE-2026-74611 | 9.8 CRITICAL | tls: rx: restore msg_iter before TLS 1.3 optimistic retry |
| CVE-2026-74591 | 9.8 CRITICAL | mm/filemap: __filemap_add_folio() restore index before retrying |
| CVE-2026-74688 | 9.8 CRITICAL | sctp: clear control chunk transport if it is being removed |
| CVE-2026-74597 | 9.8 CRITICAL | ip6_tunnel: clear skb2->cb[] in ip6ip6_err() |
| CVE-2026-74617 | 9.8 CRITICAL | dibs: initialise dibs->lock in dibs_dev_alloc() |
| CVE-2026-74628 | 9.8 CRITICAL | net/x25: fix use-after-free of the socket by its timers |
| CVE-2026-74616 | 9.8 CRITICAL | xdp: reject clones that overrun skb_shared_info tailroom |
| CVE-2026-74587 | 9.8 CRITICAL | sctp: fix use-after-free of cached ASCONF chunk |
| CVE-2026-74608 | 9.8 CRITICAL | smb: client: Fix use-after-free in cifs_try_adding_channels() |
| CVE-2026-74723 | 9.8 CRITICAL | btrfs: lzo: reject inline extents without valid headers |
| CVE-2026-74730 | 9.8 CRITICAL | NFS: Pin the 'struct nfs_server' during a FREE_STATEID call |
| CVE-2026-74727 | 9.8 CRITICAL | ovpn: skip rehash for peers already removed from by_id |
| CVE-2026-74586 | 9.8 CRITICAL | sctp: clear new_transport when removing a peer |
| CVE-2026-74662 | 9.8 CRITICAL | inet: frags: publish queues before arming timer |
| CVE-2026-74588 | 9.8 CRITICAL | sctp: keep chunk->transport in step with the list it is queued on |
| CVE-2026-74669 | 9.8 CRITICAL | ipvs: clear IPv4 options after rebasing tunnel ICMP errors |
| CVE-2026-74712 | 9.3 CRITICAL | vdpa/mlx5: Fix buffer length in create_direct_keys() |
| CVE-2026-74665 | 9.1 CRITICAL | net: fix skb length accounting after generic XDP frag adjustment |
Showing top 20 of 150 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
-
CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock -
CVE-2026-74732
drm/amd/display: Check for tg ops in dce110_set_avmute -
CVE-2026-74731
sched_ext: Skip sub-disable teardown for never-linked sub-sc -
CVE-2026-74730
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call -
CVE-2026-74729
soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_
Same vendor: Linux
-
CVE-2026-74733
gpio: pca953x: fix pca953x_irq_bus_sync_unlock regmap lock -
CVE-2026-74732
drm/amd/display: Check for tg ops in dce110_set_avmute -
CVE-2026-74731
sched_ext: Skip sub-disable teardown for never-linked sub-sc -
CVE-2026-74730
NFS: Pin the 'struct nfs_server' during a FREE_STATEID call -
CVE-2026-74729
soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_
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