CVE-2026-89689Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: nfsd: don't free session slots that are still in use nfsd4_sequence() can free the very slot it is currently processing. When the session shrinker has reduced se_targe…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7.4
— → 9.8
none → critical
9.8 → 7.4
critical → high
7.4 → 9.8
high → critical
9.8 → 7.4
critical → high
7.4 → 7
0.2% → 0.6%
Last analysed / modified upstream
7 → 9.8
high → critical
In the Linux kernel, the following vulnerability has been resolved:
nfsd: don't free session slots that are still in use
nfsd4_sequence() can free the very slot it is currently processing. When the session shrinker has reduced se_target_maxslots below se_fchannel.maxreqs, the shrink path checks three conditions before calling free_session_slots():
However, seq->slotid is never checked against se_target_maxslots. A client using a slot in the range [se_target_maxslots, maxreqs) can satisfy all three conditions: its slot has the current generation (set by a prior SEQUENCE), and it sends sa_highest_slotid <= se_target_maxslots to acknowledge the reduction.
free_session_slots() then kfrees every slot at index >= se_target_maxslots, including the caller's own slot. The function continues to write sl_seqid, sl_flags, sl_generation, and stores the dangling pointer in cstate->slot. Later, nfsd4_store_cache_entry() copies up to maxresp_cached bytes of the compound reply into the freed sl_data[] array, corrupting whatever slab object now occupies that address.
Additionally, a concurrent thread processing SEQUENCE on a different high-numbered slot can have its slot freed out from under it. NFSD4_SLOT_INUSE is set under nn->client_lock before the lock is released, so any concurrent thread past SEQUENCE will have its slot marked. However, free_session_slots() does not check NFSD4_SLOT_INUSE before freeing.
Fix both problems by:
Linux >= fc8738c68d0bbf5033dd98b4f63d277ecbd49fd7 < 72d40b103bb03f0124d3a3c8f71a30cbafaf6afaLinux >= fc8738c68d0bbf5033dd98b4f63d277ecbd49fd7 < b449b134e7762ddf98653a4b1d3e76d2d212ea64Linux >= fc8738c68d0bbf5033dd98b4f63d277ecbd49fd7 < f5d22e372f4ac3eb287037a488c29691d52a6330Linux 6.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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