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CVE Record

CVE-2024-26842: scsi: ufs: core: Fix shift issue in ufshcd_clear_cmd()

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Fix shift issue in ufshcd_clear_cmd() When task_tag >= 32 (in MCQ mode) and sizeof(unsigned int) == 4, 1U << task_tag will out of bounds for a u32 mask. Fix this up to prevent SHIFT_ISSUE (bitwise shifts that are out of bounds for their data type). [name:debug_monitors&]Unexpected kernel BRK exception at EL1 [name:traps&]Internal error: BRK handler: 00000000f2005514 [#1] PREEMPT SMP [name:mediatek_cpufreq_hw&]cpufreq stop DVFS log done [name:mrdump&]Kernel Offset: 0x1ba5800000 from 0xffffffc008000000 [name:mrdump&]PHYS_OFFSET: 0x80000000 [name:mrdump&]pstate: 22400005 (nzCv daif +PAN -UAO) [name:mrdump&]pc : [0xffffffdbaf52bb2c] ufshcd_clear_cmd+0x280/0x288 [name:mrdump&]lr : [0xffffffdbaf52a774] ufshcd_wait_for_dev_cmd+0x3e4/0x82c [name:mrdump&]sp : ffffffc0081471b0 <snip> Workqueue: ufs_eh_wq_0 ufshcd_err_handler Call trace: dump_backtrace+0xf8/0x144 show_stack+0x18/0x24 dump_stack_lvl+0x78/0x9c dump_stack+0x18/0x44 mrdump_common_die+0x254/0x480 [mrdump] ipanic_die+0x20/0x30 [mrdump] notify_die+0x15c/0x204 die+0x10c/0x5f8 arm64_notify_die+0x74/0x13c do_debug_exception+0x164/0x26c el1_dbg+0x64/0x80 el1h_64_sync_handler+0x3c/0x90 el1h_64_sync+0x68/0x6c ufshcd_clear_cmd+0x280/0x288 ufshcd_wait_for_dev_cmd+0x3e4/0x82c ufshcd_exec_dev_cmd+0x5bc/0x9ac ufshcd_verify_dev_init+0x84/0x1c8 ufshcd_probe_hba+0x724/0x1ce0 ufshcd_host_reset_and_restore+0x260/0x574 ufshcd_reset_and_restore+0x138/0xbd0 ufshcd_err_handler+0x1218/0x2f28 process_one_work+0x5fc/0x1140 worker_thread+0x7d8/0xe20 kthread+0x25c/0x468 ret_from_fork+0x10/0x20

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel storage-driver bug. On systems using UFS storage in MCQ mode, certain command tags can trigger an invalid bit shift and a kernel BRK exception, causing a crash. The public record does not show active exploitation or a CVSS score.

Executive priority

Schedule remediation through the normal kernel update process, with higher priority for fleets where UFS storage outages would affect customer service, device availability, or operational continuity. There is no source-backed evidence of active exploitation in the provided bundle.

Technical view

ufshcd_clear_cmd() used 1U << task_tag against a u32 mask. When task_tag is 32 or greater in MCQ mode, the shift is out of bounds for a 32-bit unsigned value, producing SHIFT_ISSUE behavior and observed kernel exception traces in UFS error handling.

Likely exposure

Exposure is most likely on Linux systems in the listed affected kernel ranges that use UFS storage with MCQ mode enabled. The bundle lists Linux 6.5, 6.6.19, 6.7.7, and 6.8 as affected, but product-specific distribution status is not provided.

Exploitation context

The source bundle does not cite public exploitation, weaponized techniques, or CISA KEV listing. The available evidence is a kernel crash trace and upstream stable fixes. Treat this primarily as an availability and reliability risk unless a vendor advisory states otherwise.

Researcher notes

The vulnerability is narrowly tied to UFS core command clearing in MCQ mode and an out-of-bounds shift on 32-bit masks. The bundle lacks CVSS, CWE, distro advisories, and exploitability analysis, so validation should focus on kernel version, UFS/MCQ presence, and backport evidence.

Mitigation direction

  • Review vendor or distribution advisories for kernels containing the referenced stable fixes.
  • Prioritize updates on UFS-based mobile, embedded, edge, or appliance Linux deployments.
  • If immediate patching is unavailable, monitor for UFS error-handler crashes and vendor workarounds.
  • Do not assume non-upstream kernels are fixed without checking their backport status.

Validation and detection

  • Inventory Linux kernel versions on systems using UFS storage controllers.
  • Confirm whether UFS MCQ mode is enabled or supported on affected devices.
  • Check kernel changelogs for the referenced ufshcd_clear_cmd() fix commits.
  • Review logs for BRK exceptions or crashes involving ufshcd_clear_cmd().
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2024-26842 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxadf452611677d048203398f489e2175a9068f9f7, adf452611677d048203398f489e2175a9068f9f7, adf452611677d048203398f489e2175a9068f9f7unaffected
LinuxLinux6.5, 0, 6.6.19, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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