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NVD / CVE Program· CNA Linux

CVE-2026-64312: crypto: pcrypt - restore callback for non-parallel fallback

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.50% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 3920c5f6edc341729d20d0507e466c6d3b11f372, 4.20, 4711ca06bd169a2cbc9cc59a6de2ed512c41a880.

Low priority for now. Upgrade to Linux Linux 3920c5f6edc341729d20d0507e466c6d3b11f372, 4.20, 4711ca06bd169a2cbc9cc59a6de2ed512c41a880 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: crypto: pcrypt - restore callback for non-parallel fallback pcrypt installs pcrypt_aead_done() on the child AEAD request before trying to submit it through padata. If padata_do_parallel() returns -EBUSY, pcrypt falls back to calling the child AEAD directly. That fallback must not keep the padata completion callback. Otherwise an asynchronous completion runs pcrypt_aead_done() even though the request was never enrolled in padata. Restore the original request callback and callback data before calling the child AEAD directly. This keeps the fallback path aligned with a direct AEAD request while leaving the parallel path unchanged.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Oct 24, 2026
EPSS
0.5% · 43th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-64312

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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 kernel4.19.325 and later · before 4.20
  • linux linux kernel5.4.287 and later · before 5.5
  • linux linux kernel5.10.231 and later · before 5.10.261
  • linux linux kernel5.15.174 and later · before 5.15.212
  • linux linux kernel6.1.120 and later · before 6.1.178
  • linux linux kernel6.6.64 and later · before 6.6.145
  • linux linux kernel6.11.11 and later · before 6.12
  • linux linux kernel6.12.2 and later · before 6.12.96
  • linux linux kernel6.13 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4

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

    • dd8bf8eb5beba1e7c3b11a9a5a58ccbf345a69e6, fca8aed12218f96b38e374ff264d78ea1fbd23cc, a8e0074ffb38c9a5964a221bb998034d016c93a2, 6.13affected
    • a92ccd3618e42333ac6f150ecdac14dca298bc7a and later · before 81ce16d938db9b88cdc231522c0358395ae8c6b5affected · git
    • 96001f52ae8c70e2c736d3e1e5dc53d5b521e5ca and later · before 3920c5f6edc341729d20d0507e466c6d3b11f372affected · git
    • 92834692a539b5b7f409e467a14667d64713b732 and later · before ae93c5b3e2a2968b56d772ca1d06615927b7cc36affected · git
    • 5edae7a9a35606017ee6e05911c290acee9fee5a and later · before 82789a44415e3e31168229421b138278dfb16412affected · git
    • 7ddab756f2de5b7b43c122ebebdf37f400fb2b6f and later · before 4711ca06bd169a2cbc9cc59a6de2ed512c41a880affected · git
    • 662f2f13e66d3883b9238b0b96b17886179e60e2 and later · before c4bd2f4c35b0e15b6040c2f7e7e7986780c066cfaffected · git
    • 662f2f13e66d3883b9238b0b96b17886179e60e2 and later · before 83fa1397d5853de1e27dd52ec44b068ff358ca18affected · git
    • 662f2f13e66d3883b9238b0b96b17886179e60e2 and later · before ed459fe319376e876de433d12b6c6772e612ca36affected · git
    • 5.10.231 and later · before 5.10.261affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.96-16.12.96-1
Debian:14linuxbefore 7.1.4-17.1.4-1

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-2026-64310Jul 25, 2026 · crypto: ccp - Do not initialize SNP for SEV ioctls
    22Monitor
  • ← EarlierCVE-2026-64311Jul 25, 2026 · crypto: loongson - Remove broken and unused loongson-rng
    31Monitor
  • Later →CVE-2026-64313Jul 25, 2026 · crypto: ecc - Fix carry overflow in vli multiplication
    35Monitor

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 Linux3920c5f6edc341729d20d0507e466c6d3b11f372Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux4711ca06bd169a2cbc9cc59a6de2ed512c41a880Vendor (CNA)
Linux Linux5.10.261Vendor (CNA)
Linux Linux5.15.212Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6.1.178Vendor (CNA)
Linux Linux6.12Vendor (CNA)
Linux Linux6.12.96Vendor (CNA)
Linux Linux6.6.145Vendor (CNA)
Linux Linux81ce16d938db9b88cdc231522c0358395ae8c6b5Vendor (CNA)
Linux Linux82789a44415e3e31168229421b138278dfb16412Vendor (CNA)
Linux Linux83fa1397d5853de1e27dd52ec44b068ff358ca18Vendor (CNA)
Linux Linuxae93c5b3e2a2968b56d772ca1d06615927b7cc36Vendor (CNA)
Linux Linuxc4bd2f4c35b0e15b6040c2f7e7e7986780c066cfVendor (CNA)
Linux Linuxed459fe319376e876de433d12b6c6772e612ca36Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package 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.

  • CVE-2026-5327730 days apartKVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation
    35Monitor
  • CVE-2026-4346678 days apartnet/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
    32Monitor
  • CVE-2026-3147994 days apartdrm/xe: always keep track of remap prev/next
    31Monitor
  • CVE-2026-23437113 days apartnet: shaper: protect late read accesses to the hierarchy
    22Monitor

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-662 · Improper Synchronization

CVSS vector

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

nvd-secondary

Attack context

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

Change log

  1. SSVC exploitation— → none
  2. 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