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NVD / CVE Program· CNA Linux

CVE-2026-80776: futex: Fix race in futex_pivot_pending() during private hash resize

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Fixed version: Linux Linux 19b4be0717fa83265d66aea836b7022d898422cf, 4a7e941ca29a608c6244cbd028d3599ecaef7207, 8e7ff730dd96519a333d1570edf1c3fabb6d3629.

Low priority for now. Upgrade to Linux Linux 19b4be0717fa83265d66aea836b7022d898422cf, 4a7e941ca29a608c6244cbd028d3599ecaef7207, 8e7ff730dd96519a333d1570edf1c3fabb6d3629 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: futex: Fix race in futex_pivot_pending() during private hash resize A task performing a custom private hash resize can remain blocked in uninterruptible sleep indefinitely. The hung-task detector reports: INFO: task futex-resizer:314 blocked for more than 10 seconds. task:futex-resizer state:D stack:14824 pid:314 tgid:312 ppid:311 Call Trace: __schedule+0x521/0xf30 schedule+0x22/0xa0 futex_hash_allocate+0x3db/0x490 __do_sys_prctl+0x6f5/0xbd0 do_syscall_64+0xf9/0x530 entry_SYSCALL_64_after_hwframe+0x77/0x7f Kernel panic - not syncing: hung_task: blocked tasks futex_pivot_pending() allows the resize request to continue when either no replacement hash is pending (hash_new == NULL) or the current hash reference count has reached zero. After the final-reference wake, another futex task can complete the pivot between the two observations: T1 T2 futex_hash_allocate() wait_var_event(mm, ...) futex_pivot_pending(mm) hash_new != NULL futex_hash() futex_ref_get(old) -> false futex_pivot_hash(mm) hash_new = NULL __futex_pivot_hash(mm, new) rcu_assign_pointer(hash, new) fph = rcu_dereference(hash) /* new */ futex_ref_is_dead(fph) -> false schedule() The pivot changes the state from hash_new != NULL with a dead current hash to hash_new == NULL with a live current hash. Because futex_pivot_pending() reads hash_new and hash without serialization, the resize task can observe hash_new in the pre-pivot state and hash in the post-pivot state, causing futex_pivot_pending() to return false even though the pivot has completed. The task then goes to sleep after the wakeup has already been consumed. Serialize state reads in futex_pivot_pending() using futex_mm_phash::lock. This guarantees that futex_pivot_pending() observes hash_new and hash atomically, eliminating the race condition.

—No exploit Fix available
Published
Sep 4, 2026
Updated
Sep 4, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

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Affected systems

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.16affected
    • bd54df5ea7cadac520e346d5f0fe5d58e635b6ba and later · before 4a7e941ca29a608c6244cbd028d3599ecaef7207affected · git
    • bd54df5ea7cadac520e346d5f0fe5d58e635b6ba and later · before 19b4be0717fa83265d66aea836b7022d898422cfaffected · git
    • bd54df5ea7cadac520e346d5f0fe5d58e635b6ba and later · before 8e7ff730dd96519a333d1570edf1c3fabb6d3629affected · git
    • before 6.16not affected · semver
    • 6.18.46 and later · up to and including 6.18.*not affected · semver
    • 7.1.11 and later · up to and including 7.1.*not affected · semver
    • 7.2 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:14linuxbefore 7.1.12-17.1.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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Published before and after this one in the same product

  • ← EarlierCVE-2026-80754Sep 3, 2026 · Input: synaptics-rmi4 - fix F55 transmitter electrode count typo
    31Monitor
  • ← EarlierCVE-2026-80755Sep 3, 2026 · selinux: reject a permission value exceeding the class permission count
    0Monitor
  • Later →CVE-2026-80784Sep 4, 2026 · mptcp: pm: fix memory leak from alloc-during-teardown race
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux19b4be0717fa83265d66aea836b7022d898422cfVendor (CNA)
Linux Linux4a7e941ca29a608c6244cbd028d3599ecaef7207Vendor (CNA)
Linux Linux8e7ff730dd96519a333d1570edf1c3fabb6d3629Vendor (CNA)
debian:linux7.1.12-1 · Debian:14Package registry (OSV)

Exploit status

No known public exploit

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Research context

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Timeline

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EPSS, last 120 days

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No nightly-computed relations.

Chain candidates

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—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

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Weakness class (CWE)

—

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Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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