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NVD / CVE Program· CNA Linux

CVE-2026-64164: btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.11% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0a96d9a85cd2240481297156b9bb72e10b7a8036, 12a0487945c09760a5968d9333383014ea294117, 26b2290baaf6da6add0f782a100766e686a33f4f.

Low priority for now. Upgrade to Linux Linux 0a96d9a85cd2240481297156b9bb72e10b7a8036, 12a0487945c09760a5968d9333383014ea294117, 26b2290baaf6da6add0f782a100766e686a33f4f 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: btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file() The trace event btrfs_sync_file() is called in an atomic context (all trace events are) and its call to dput(), which is needed due to the call to dget_parent(), can sleep, triggering a kernel splat. This can be reproduced by enabling the trace event and running btrfs/056 from fstests for example. The splat shown in dmesg is the following: [53.919] BUG: sleeping function called from invalid context at fs/dcache.c:970 [53.947] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 32773, name: xfs_io [53.988] preempt_count: 2, expected: 0 [53.967] RCU nest depth: 0, expected: 0 [53.943] Preemption disabled at: [53.944] [<0000000000000000>] 0x0 [54.078] CPU: 0 UID: 0 PID: 32773 Comm: xfs_io Tainted: G W 7.1.0-rc1-btrfs-next-232+ #1 PREEMPT(full) [54.070] Tainted: [W]=WARN [54.071] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014 [54.072] Call Trace: [54.074] <TASK> [54.076] dump_stack_lvl+0x56/0x80 [54.079] __might_resched.cold+0xd6/0x10f [54.072] dput.part.0+0x24/0x110 [54.078] trace_event_raw_event_btrfs_sync_file+0x75/0x140 [btrfs] [54.089] btrfs_sync_file+0x1ed/0x530 [btrfs] [54.087] ? __handle_mm_fault+0x8ae/0xed0 [54.089] btrfs_do_write_iter+0x172/0x210 [btrfs] [54.091] vfs_write+0x21f/0x450 [54.094] __x64_sys_pwrite64+0x8d/0xc0 [54.096] ? do_user_addr_fault+0x20c/0x670 [54.099] do_syscall_64+0x60/0xf20 [54.092] ? clear_bhb_loop+0x60/0xb0 [54.094] entry_SYSCALL_64_after_hwframe+0x76/0x7e So stop using dget_parent() and dput() and access the parent dentry directly as dentry->d_parent. This is also what ext4 is doing in its equivalent trace event ext4_sync_file_enter().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 19, 2026
Updated
Aug 13, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.6.136 and later · before 6.6.142
  • linux linux kernel6.12.83 and later · before 6.12.92
  • linux linux kernel6.18.24 and later · before 6.18.34
  • linux linux kernel6.19.14 and later · before 7.0
  • linux linux kernel7.0.1 and later · before 7.0.11
  • linux linux kernel7.0
  • linux linux kernel7.1

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

    • d110d7cdb045715c0b45b0dfd974525bb38f653d, 7.0affected
    • 4a7bab35fad5251c8cb738161152578cd83b6b9c and later · before d78b0a80eac36879ef5478707135c446920e134baffected · git
    • 520e8b4bcf872a534a7bf61ccf880047642df296 and later · before 4361954f0e158af0530caa1e57f12b531be4658faffected · git
    • e252db8ca2a01f82d472091f35d549b313278636 and later · before 6279992c9ba2774901c9d4dd4a481162e2534714affected · git
    • c09a7446aab5773f38d6abb25fce99b8e1dfbc97 and later · before 26b2290baaf6da6add0f782a100766e686a33f4faffected · git
    • 32372781d664a9b03c40343e96c29d0a6139f97d and later · before 12a0487945c09760a5968d9333383014ea294117affected · git
    • 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a and later · before c32a7e0e3c73c1c0768556a56bd78de9f7b83780affected · git
    • a85b46db143fda5869e7d8df8f258ccef5fa1719 and later · before 0a96d9a85cd2240481297156b9bb72e10b7a8036affected · git
    • a85b46db143fda5869e7d8df8f258ccef5fa1719 and later · before c73370c677646e86fc4b1780fb07027bdf847375affected · git
    • 6.6.136 and later · before 6.6.142affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64157Jul 19, 2026 · netfs: Fix partial invalidation of streaming-write folio
    22Monitor
  • ← EarlierCVE-2026-64161Jul 19, 2026 · net: ti: icssm-prueth: fix eth_ports_node leak in probe
    22Monitor
  • Later →CVE-2026-64165Jul 19, 2026 · ARM: integrator: Fix early initialization
    22Monitor

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 Linux0a96d9a85cd2240481297156b9bb72e10b7a8036Vendor (CNA)
Linux Linux12a0487945c09760a5968d9333383014ea294117Vendor (CNA)
Linux Linux26b2290baaf6da6add0f782a100766e686a33f4fVendor (CNA)
Linux Linux4361954f0e158af0530caa1e57f12b531be4658fVendor (CNA)
Linux Linux6.12.92Vendor (CNA)
Linux Linux6.18.34Vendor (CNA)
Linux Linux6.20Vendor (CNA)
Linux Linux6.6.142Vendor (CNA)
Linux Linux6279992c9ba2774901c9d4dd4a481162e2534714Vendor (CNA)
Linux Linuxc32a7e0e3c73c1c0768556a56bd78de9f7b83780Vendor (CNA)
Linux Linuxc73370c677646e86fc4b1780fb07027bdf847375Vendor (CNA)
Linux Linuxd78b0a80eac36879ef5478707135c446920e134bVendor (CNA)
debian:linux6.12.94-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

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

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

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

All records