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CVE-2026-99280

ksmbd: drain session procfs readers before dropping table references

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: drain session procfs readers before dropping table references Session registration failure and connection cleanup can drop the table reference while the per-session procfs entry is still accessible. If a reader holds the last remaining reference, its final put calls proc_remove() from its own callback and waits for that callback to finish. Remove the procfs entry before dropping the table reference in the registration failure path. Queue sessions removed during connection cleanup and drain their procfs readers after releasing both session locks, then return their table references. Keep the global hash node unhashed while a session is queued so a concurrent unregister cannot drop the reference again. Previous-session replacement also destroys the file table before the session is finally freed. Detach the idr under the lock used by procfs file counters, and report zero files after it has been detached. This prevents a reader from accessing the idr during or after its destruction.

Timeline

  1. ID reserved

    By Linux

  2. · 43 days later

    Published

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)
0.14% · top 96% of all CVEs (12 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

  • Linux · Linux

    • affected d7fd1f98607f2cd358e583f9548bdf0173090a86 – < 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c
    • affected d7fd1f98607f2cd358e583f9548bdf0173090a86 – < 1c087cf7d5386c708d8984b263280b42b3daada0
    • affected c99ea7855124ca1428a1e59c2b4590aaef34eacf
    • affected 7.2.8 – < 7.3

  • Linux · Linux

    • affected 7.3
    • unaffected < 7.3
    • unaffected 7.3.2 – ≤ 7.3.*
    • unaffected 7.4-rc1 – ≤ *

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .