CVE-2026-74266

UNRATEDCVSS · not yet scored
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

net/sched: sch_dualpi2: Do not call qdisc_tree_reduce_backlog during peek before restoring qlen

Whenever dualpi2 drops packets during peek, it calls qdisc_tree_reduce_backlog. An issue arises because it calls qdisc_tree_reduce_backlog before it reincrements the qlen. If qlen drops to zero, but peek returns an skb, the parent's qlen_notify callback will be executed even though dualpi2 still has 1 packet on the queue and, thus, mistakenly deactivates the parent's class which leads to a null-ptr-deref:

[ 101.427314][ T599] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] SMP KASAN NOPTI [ 101.427755][ T599] KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] [ 101.428048][ T599] CPU: 2 UID: 0 PID: 599 Comm: ping Not tainted 7.1.0-rc5-00284-gbce53c430ed7 #102 PREEMPT(full) [ 101.428400][ T599] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 101.428608][ T599] RIP: 0010:qfq_dequeue (net/sched/sch_qfq.c:1150) sch_qfq [ 101.428821][ T599] Code: 00 fc ff df 80 3c 02 00 0f 85 46 0c 00 00 4c 8d 73 48 48 89 9d b8 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 2d 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b All code [ 101.429348][ T599] RSP: 0018:ffff8881110df4f0 EFLAGS: 00010216 [ 101.429541][ T599] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: dffffc0000000000 [ 101.429763][ T599] RDX: 0000000000000009 RSI: 00000024c0000000 RDI: ffff88811436c2b0 [ 101.429985][ T599] RBP: ffff88811436c000 R08: ffff88811436c280 R09: 1ffff11021277523 [ 101.430206][ T599] R10: 1ffff11021277526 R11: 1ffff11021277527 R12: 00000024c0000000 [ 101.430423][ T599] R13: ffff88811436c2b8 R14: 0000000000000048 R15: 0000000020000000 [ 101.430642][ T599] FS: 00007f61813e1c40(0000) GS:ffff8881691ef000(0000) knlGS:0000000000000000 [ 101.430913][ T599] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 101.431100][ T599] CR2: 00005651650850a8 CR3: 000000010ca0b000 CR4: 0000000000750ef0 [ 101.431320][ T599] PKRU: 55555554 [ 101.431433][ T599] Call Trace: [ 101.431544][ T599] [ 101.431628][ T599] __qdisc_run (net/sched/sch_generic.c:322 net/sched/sch_generic.c:427 net/sched/sch_generic.c:445) [ 101.431792][ T599] ? dev_qdisc_enqueue (./include/trace/events/qdisc.h:49 (discriminator 22) net/core/dev.c:4176 (discriminator 22)) [ 101.431941][ T599] __dev_queue_xmit (./include/net/pkt_sched.h:120 ./include/net/pkt_sched.h:117 net/core/dev.c:4292 net/core/dev.c:4831)

Fix this by only calling qdisc_tree_reduce_backlog in peek after the qlen is restored.

CVSS v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
—
EG Risk
—
EPSS PROB
0.2%
EPSS %ILE
10th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

EG Severity
Not assessed: no CVSS publishedA missing CVSS is not a severity of zero.
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
No SSVC decision: EchelonGraph has not assessed this CVECISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the BOD 26-04 block below.

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 15, 2026

Last Modified

August 17, 2026

References (3)

Vendor Advisories for CVE-2026-74266(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-azure-lts-26.04 (7.0.0-1017.17) @ resolute2026-10-06ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1015.15) @ resolute2026-10-06ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-38.38) @ resolute2026-10-06ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (160 versions)
  • every version up to 7.1.5-1: fixed in 7.1.5-1
—

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 39× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 88 are merged into the row they repeat.

  1. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  3. 2026-10-18 03:14 UTCEG score recompute
  4. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  5. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  6. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  7. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  8. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  9. 2026-10-12 15:40 UTCEG score recompute
  10. 2026-10-11 19:26 UTCEG score recompute
  11. 2026-10-11 16:41 UTCEG score recompute
  12. 2026-10-11 14:00 UTCEG score recompute
  13. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  15. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  18. 2026-10-06 17:13 UTCVendor advisory
  19. 2026-10-06 17:13 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  23. 2026-10-03 19:32 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 9th percentile
Show 59 more
  1. 2026-09-30 21:01 UTCEG score recompute
  2. 2026-09-30 21:00 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  3. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  4. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  5. 2026-09-27 16:44 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  6. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  8. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  9. 2026-09-24 17:04 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  10. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  11. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  12. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-09-21 19:15 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  14. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  15. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-09-18 19:16 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  17. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  18. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  19. 2026-09-15 21:45 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  20. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-09-12 22:57 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  22. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  23. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  24. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-09-10 01:24 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  27. 2026-09-06 23:43 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  28. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  29. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  30. 2026-09-04 02:12 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  31. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  33. 2026-09-01 04:44 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  34. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  36. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  37. 2026-08-29 06:23 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  38. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  39. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  40. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  41. 2026-08-25 22:46 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  42. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  43. 2026-08-23 01:18 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  44. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  45. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  46. 2026-08-20 03:51 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  47. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  48. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  49. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  50. 2026-08-17 06:23 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  51. 2026-08-17 06:22 UTCNVD update
  52. 2026-08-17 05:27 UTCEG score recompute
  53. 2026-08-17 05:27 UTCGHSA enrichmentGHSA-frwj-6925-xvf6
  54. 2026-08-17 05:24 UTCMITRE cvelistV5
  55. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  56. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  57. 2026-08-15 06:23 UTCNVD update
  58. 2026-08-15 06:17 UTCEG score recompute
  59. 2026-08-15 06:12 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2026-74266?
CVE-2026-74266 is a vulnerability whose severity is not yet rated; its CVE record was published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: net/sched: schdualpi2: Do not call qdisctreereducebacklog during peek before restoring qlen Whenever dualpi2 drops packets during peek, it calls qdisctreereduce_backlog. An issue arises because it calls qdisctreereduce_backlog…
When was the CVE record for CVE-2026-74266 published?
The CVE record for CVE-2026-74266 was published on August 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 17, 2026; the record at its source may have been updated since.
Is CVE-2026-74266 actively exploited?
CVE-2026-74266 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-74266?
A fix for CVE-2026-74266 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-74266 are linked in the Vendor Advisories panel on this page.

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