nvme: zero the discard fallback page
In the Linux kernel, the following vulnerability has been resolved: nvme: zero the discard fallback page nvme_setup_discard() always maps sizeof(struct nvme_dsm_range) * NVME_DSM_MAX_RANGES = 4096 bytes as the DSM payload however many ranges the command declares, because some devices ignore the 'Number of Ranges' field - the Fixes: commit records two that read past the declared ranges. A single-range discard fills only the first 16 bytes. Normally the buffer comes from kzalloc() and the other 4080 bytes are zero. When that allocation fails the code falls back to the per-controller ctrl->discard_page, which nvme_init_ctrl() obtains with alloc_page(GFP_KERNEL) and nothing ever zeroes, so those 4080 bytes are whatever the page last held and are handed to the controller. Reaching it requires the kzalloc(GFP_ATOMIC | __GFP_NOWARN) to fail, that is memory pressure; it is not remotely triggerable. Failing the allocation under KMSAN reproduces it, with the leaked tail full of vmemmap struct page pointers. The extent in the report is a partial transfer of the payload, not the whole 4096 bytes; the 16-byte boundary in it is the one declared range: [ 11.991601] BUG: KMSAN: uninit-value in dma_map_phys+0x14c8/0x1900 [ 11.991969] dma_map_phys+0x14c8/0x1900 [ 11.992220] dma_map_page_attrs+0xcf/0x130 [ 11.992485] e1000_xmit_frame+0x4099/0x6d10 [ 11.992768] dev_hard_start_xmit+0x22f/0xa80 [ 11.993068] sch_direct_xmit+0x35c/0xcb0 [ 11.993315] __dev_queue_xmit+0x1ee5/0x5eb0 [ 11.993608] ip_fin
CVE-2026-89483
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-2026-89483
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": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "76139b5bbf531e675934b97227be3521c7fdd537",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "3f84d2bd0d8ae8c7e8e0f8fc3cbf018a282971a1",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "415f2772ebcbc7f3f1ab1a71915dab82cee3465e",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "66b5af23b6f956e57f8205c46aa80b054631be34",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "dc4d4b70a863f7e39ef8bd137634be4e6db8b084",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "67551d8430df94c827e1830bd3a5fae1f66a5219",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "f5827817b4fc7feeabf4f53fb4b626e6edc52fef",
"versionType": "git"
},
{
"status": "affected",
"version": "530436c45ef2e446c12538a400e465929a0b3ade",
"lessThan": "bededeaaeff404978a5a8e2a605a6c3017cddd3e",
"versionType": "git"
},
{
"status": "affected",
"version": "ffa56cbdd2409b522b4cb56461bea1c45889417b",
"versionType": "git"
},
{
"status": "affected",
"version": "8b0acb768a06083b0d28bace1481c1f6679e76f4",
"versionType": "git"
},
{
"status": "affected",
"version": "4.19.92",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.7",
"lessThan": "5.5",
"versionType": "semver"
}
],
"programFiles": [
"drivers/nvme/host/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/nvme/host/core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89483
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35011 · Revision 1
- Added to Heist Feed
- Publisher date