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NVD / CVE Program· CNA Linux

CVE-2025-68325: net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop

—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 0b6216f9b3d1c33c76f74511026e5de5385ee520, 38abf6e931b169ea88d7529b49096f53a5dcf8fe, 3ed6c458530a547ed0c9ea0b02b19bab620be88b.

Low priority for now. Upgrade to Linux Linux 0b6216f9b3d1c33c76f74511026e5de5385ee520, 38abf6e931b169ea88d7529b49096f53a5dcf8fe, 3ed6c458530a547ed0c9ea0b02b19bab620be88b 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: net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop In cake_drop(), qdisc_tree_reduce_backlog() is used to update the qlen and backlog of the qdisc hierarchy. Its caller, cake_enqueue(), assumes that the parent qdisc will enqueue the current packet. However, this assumption breaks when cake_enqueue() returns NET_XMIT_CN: the parent qdisc stops enqueuing current packet, leaving the tree qlen/backlog accounting inconsistent. This mismatch can lead to a NULL dereference (e.g., when the parent Qdisc is qfq_qdisc). This patch computes the qlen/backlog delta in a more robust way by observing the difference before and after the series of cake_drop() calls, and then compensates the qdisc tree accounting if cake_enqueue() returns NET_XMIT_CN. To ensure correct compensation when ACK thinning is enabled, a new variable is introduced to keep qlen unchanged.

Published
Dec 18, 2025
Updated
Oct 13, 2026
EPSS
0.1% · 9th 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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  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 7689ab22de36f8db19095f6bdf11f28cfde92f5c, 62d591dde4defb1333d202410609c4ddeae060b3, 6.17affected
    • de04ddd2980b48caa8d7e24a7db2742917a8b280 and later · before a3f4e3de41a3f115db35276c6b186ccbc913934aaffected · git
    • 0dacfc5372e314d1219f03e64dde3ab495a5a25e and later · before 38abf6e931b169ea88d7529b49096f53a5dcf8feaffected · git
    • 710866fc0a64eafcb8bacd91bcb1329eb7e5035f and later · before fcb91be52eb6e92e00b533ebd7c77fecada537e1affected · git
    • aa12ee1c1bd260943fd6ab556d8635811c332eeb and later · before d01f0e072dadb02fe10f436b940dd957aff0d7d4affected · git
    • ff57186b2cc39766672c4c0332323933e5faaa88 and later · before 0b6216f9b3d1c33c76f74511026e5de5385ee520affected · git
    • 15de71d06a400f7fdc15bf377a2552b0ec437cf5 and later · before 529c284cc2815c8350860e9a31722050fe7117cbaffected · git
    • 15de71d06a400f7fdc15bf377a2552b0ec437cf5 and later · before 3ed6c458530a547ed0c9ea0b02b19bab620be88baffected · git
    • 15de71d06a400f7fdc15bf377a2552b0ec437cf5 and later · before 9fefc78f7f02d71810776fdeb119a05a946a27ccaffected · git
    • 5.10.241 and later · before 5.10.248affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.162-16.1.162-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.13-16.17.13-1
openSUSE:Tumbleweedkernel-sourcebefore 6.18.2-1.16.18.2-1.1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-68323Dec 18, 2025 · usb: typec: ucsi: fix use-after-free caused by uec->work
    0Monitor
  • ← EarlierCVE-2025-68324Dec 18, 2025 · scsi: imm: Fix use-after-free bug caused by unfinished delayed work
    0Monitor
  • Later →CVE-2025-68326Dec 22, 2025 · drm/xe/guc: Fix stack_depot usage
    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 Linux0b6216f9b3d1c33c76f74511026e5de5385ee520Vendor (CNA)
Linux Linux38abf6e931b169ea88d7529b49096f53a5dcf8feVendor (CNA)
Linux Linux3ed6c458530a547ed0c9ea0b02b19bab620be88bVendor (CNA)
Linux Linux5.10.248Vendor (CNA)
Linux Linux5.15.198Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux529c284cc2815c8350860e9a31722050fe7117cbVendor (CNA)
Linux Linux6.1.160Vendor (CNA)
Linux Linux6.12.63Vendor (CNA)
Linux Linux6.17Vendor (CNA)
Linux Linux6.6.120Vendor (CNA)
Linux Linux9fefc78f7f02d71810776fdeb119a05a946a27ccVendor (CNA)
Linux Linuxa3f4e3de41a3f115db35276c6b186ccbc913934aVendor (CNA)
Linux Linuxd01f0e072dadb02fe10f436b940dd957aff0d7d4Vendor (CNA)
Linux Linuxfcb91be52eb6e92e00b533ebd7c77fecada537e1Vendor (CNA)
debian:linux6.1.162-1 · Debian:12Package registry (OSV)
opensuse:kernel-source6.18.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:22025-12-20

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.

  1. Published
  2. First PoC+1 d
  3. TodayNov 12, 2026+329 d

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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.

References

Show all references (7 more)

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

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