CVE-2026-98478
In the Linux kernel, the following vulnerability has been resolved:
scsi: ufs: core: Keep internal commands dispatchable during error handling
Commit 08b12cda6c44 ("scsi: ufs: core: Switch to scsi_get_internal_cmd()") switched UFS internal commands to allocate requests on hba->host->pseudo_sdev->request_queue, which shares the host tagset with regular LUNs.
During error recovery, ufshcd_err_handling_prepare() calls blk_mq_quiesce_tagset(&hba->host->tag_set), marking all queues in the tagset as quiesced, including pseudo_sdev->request_queue. When ufshcd_verify_dev_init() subsequently issues internal commands (e.g. NOP OUT UPIU) via blk_execute_rq(), blk_mq_run_hw_queue() skips running the quiesced queue, resulting in an unrecoverable circular wait deadlock.
Read full descriptionShow less
Keep quiescing the tagset and unquiesce the pseudo SCSI device on top of that, so internal commands stay dispatchable while the logical units remain quiesced. Re-quiesce the pseudo device before unquiescing the tagset so that quiesce_depth stays balanced.
Clock scaling and ufshcd_pause_command_processing() are unaffected: they keep quiescing the whole tagset, internal commands included.
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.17 %
- Percentile among all scored CVEs
- 6
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
Raw JSON (NVD)
Show
{
"id": "CVE-2026-98478",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "08b12cda6c44dc015bcc152613c35ee0ae8f37b9",
"lessThan": "9f6f4840def931814c106fc800f57a2d26befee6",
"versionType": "git"
},
{
"status": "affected",
"version": "08b12cda6c44dc015bcc152613c35ee0ae8f37b9",
"lessThan": "b52d695d062095327b944acf7daabbc816ab319b",
"versionType": "git"
}
],
"programFiles": [
"drivers/ufs/core/ufshcd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/ufs/core/ufshcd.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:16:58.353",
"references": [
{
"url": "https://git.kernel.org/stable/c/9f6f4840def931814c106fc800f57a2d26befee6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b52d695d062095327b944acf7daabbc816ab319b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Keep internal commands dispatchable during error handling\n\nCommit 08b12cda6c44 (\"scsi: ufs: core: Switch to scsi_get_internal_cmd()\")\nswitched UFS internal commands to allocate requests on\nhba->host->pseudo_sdev->request_queue, which shares the host tagset with\nregular LUNs.\n\nDuring error recovery, ufshcd_err_handling_prepare() calls\nblk_mq_quiesce_tagset(&hba->host->tag_set), marking all queues in the\ntagset as quiesced, including pseudo_sdev->request_queue. When\nufshcd_verify_dev_init() subsequently issues internal commands (e.g. NOP\nOUT UPIU) via blk_execute_rq(), blk_mq_run_hw_queue() skips running the\nquiesced queue, resulting in an unrecoverable circular wait deadlock.\n\nKeep quiescing the tagset and unquiesce the pseudo SCSI device on top of\nthat, so internal commands stay dispatchable while the logical units remain\nquiesced. Re-quiesce the pseudo device before unquiescing the tagset so\nthat quiesce_depth stays balanced.\n\nClock scaling and ufshcd_pause_command_processing() are unaffected: they\nkeep quiescing the whole tagset, internal commands included."
}
],
"lastModified": "2026-10-19T10:18:58.750",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}