vduse: validate virtqueue alignment
In the Linux kernel, the following vulnerability has been resolved: vduse: validate virtqueue alignment vduse_validate_config() only checks the upper bound of vq_align. Invalid values can therefore reach vring_create_virtqueue_map(). The split-ring helpers use align - 1 as a bit mask, so the alignment must be a non-zero power of two. A zero value makes vring_size() drop the descriptor and available-ring part and vring_init() leave the used ring pointer NULL. The VIRTIO spec requires the used ring to start at an address aligned to at least 4 bytes. Reject values below VRING_USED_ALIGN_SIZE as well as non-power-of-two values before they reach the virtio ring helpers. Opening a virtio-net device created with vq_align=0 triggered: BUG: KASAN: null-ptr-deref in virtqueue_kick_prepare_split+0xe3/0x100 Read of size 2 at addr 0000000000000000 by task systemd-network/1062 Call Trace (relevant frames): dump_stack_lvl print_report kasan_report __asan_load2 virtqueue_kick_prepare_split+0xe3/0x100 virtqueue_kick_prepare+0x40/0x60 try_fill_recv+0x857/0x1250 virtnet_open+0x189/0x460 __dev_open+0x225/0x390 __dev_change_flags+0x368/0x3b0 netif_change_flags+0x56/0xc0 do_setlink.isra.0+0x68c/0x1e30 Validate the value before it reaches the virtio ring helpers.
CVE-2026-97989
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97989
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
"lessThan": "650bac9c73d3b4d83be683028283654c05346556",
"versionType": "git"
},
{
"status": "affected",
"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
"lessThan": "5d4bdca17d87c90b1d888f8846a781a18aa453c9",
"versionType": "git"
},
{
"status": "affected",
"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
"lessThan": "831dab9b9bcc184adf78f18b5b788316e3174aec",
"versionType": "git"
},
{
"status": "affected",
"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
"lessThan": "c3c3b0839a1197530cc18f535062fc84dbdfc885",
"versionType": "git"
},
{
"status": "affected",
"version": "c8a6153b6c59d95c0e091f053f6f180952ade91e",
"lessThan": "fa2c25b4add57888acfa89e398389e267bff3dcf",
"versionType": "git"
}
],
"programFiles": [
"drivers/vdpa/vdpa_user/vduse_dev.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/vdpa/vdpa_user/vduse_dev.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97989
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48824 · Revision 1
- Added to Heist Feed
- Publisher date