smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
In the Linux kernel, the following vulnerability has been resolved: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.273, 5.15.224, 6.1.191, 6.12.113, 6.18.56, 6.6.160, 7.2.10
- CVEs
- CVE-2026-98681
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 18:04 UTC · Revision 1
Source evidence
smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races
core-osv · Original sourcePublished 18 Oct 2026, 15:45 UTC
In the Linux kernel, the following vulnerability has been resolved: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.
osv:CVE-2026-98681
Kernel
Fixed versions: 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.2.10
Complete source record
{
"id": "5b2e95921bc898416313cdf0645866a6bed61057b4e18b3a1f16c50e0ec0df5d",
"url": "https://osv.dev/vulnerability/CVE-2026-98681",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races",
"summary": "In the Linux kernel, the following vulnerability has been resolved: smb: client: split cifsFileInfo bitfields to avoid shared-byte RMW races The invalidHandle, swapfile, oplock_break_cancelled, offload, and status_file_deleted fields are stored in the same bitfield byte in struct cifsFileInfo, but are updated in different code paths that may run simultaneously, and are protected by different locks. Since bitfield assignments generate byte-level read-modify-write operations, a modification to one flag can overwrite a concurrent modification to another flag. To avoid these races, convert these flags from a bitfield to separate bool fields.",
"evidence": "osv:CVE-2026-98681",
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"modified": "2026-11-01T02:30:54.801135324Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/e961baf9c1a4f2e93a55f8eb2c6151fc27b96a4c",
"https://git.kernel.org/stable/c/f255e87b4f7eda568c37d6eae5db1d1a8aca5968",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98681.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-98681",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98681.json"
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},
"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 498166,
"published_at": "2026-10-18T15:45:45.654+00:00"
}