net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer
In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer In mana_hwc_rx_event_handler(), resp->response.hwc_msg_id is read from DMA-coherent memory and bounds-checked, then mana_hwc_handle_resp() re-reads the same field from the same DMA buffer for test_bit() and pointer arithmetic. DMA-coherent memory is mapped uncacheable on x86 and is shared, unencrypted, in Confidential VMs (SEV-SNP/TDX), so each load goes directly to host-visible memory. A H/W can modify the value between the check and the use, bypassing the bounds validation. Fix this by reading hwc_msg_id exactly once using READ_ONCE() into a stack-local variable in mana_hwc_rx_event_handler(), and passing the validated value as a parameter to mana_hwc_handle_resp().
CVE-2026-64034
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-2026-64034
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": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "a201c66edf2ebc6cfdc3813a889ba20fecebfae3",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "70ad2dff8d052a85dfef15715b531f38a29108cf",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "566f42fb67a7ebfed6650e407e5b72e6b3e83bf7",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "6180a06bbc99fd9114b8db4be6c4d46e40f046ef",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "09ec063d87c2dd3fa6f3561361a017bd882e9f37",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "3c4db56ccd13dd020fbf43afabaee74a40ec75e4",
"versionType": "git"
},
{
"status": "affected",
"version": "ca9c54d2d6a5ab2430c4eda364c77125d62e5e0f",
"lessThan": "35f0f0a2536a4d604b4dbad92c85c4a8fdebb870",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/microsoft/mana/hw_channel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/microsoft/mana/hw_channel.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-64034
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #40942 · Revision 1
- Added to Heist Feed
- Publisher date