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NVD / CVE Program· CNA Linux

CVE-2026-68159: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.74% (FIRST EPSS); higher than 54.8% of all records.
  • 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 42bc06c67d94d5f2a6b33294b0c4b07d8a47c515, 4daf06456677177f2a6044729abac59c1b49e87b, 590b07ceea138d49c9b64f65d263aa902d3b4730; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 42bc06c67d94d5f2a6b33294b0c4b07d8a47c515, 4daf06456677177f2a6044729abac59c1b49e87b, 590b07ceea138d49c9b64f65d263aa902d3b4730; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE __decode_pg_temp() decodes an user-controlled length but only rejects values large enough to overflow the allocation; it does not bound it to CEPH_PG_MAX_SIZE. The helper backs both pg_temp and pg_upmap decoding, and apply_upmap()/get_temp_osds() later copy the decoded list into the fixed-size on-stack array struct ceph_osds.osds[CEPH_PG_MAX_SIZE]. A monitor that sends an OSDMap with a pg_temp/pg_upmap entry longer than 32 thus causes a stack out-of-bounds write. An OSD set for a single PG can never exceed CEPH_PG_MAX_SIZE, so reject longer entries at decode time. The bound is well below the old overflow threshold, so it also covers the allocation-size overflow the previous check guarded against. BUG: KASAN: stack-out-of-bounds in ceph_pg_to_up_acting_osds Write of size 4 ... by task exploit kasan_report (mm/kasan/report.c:595) ceph_pg_to_up_acting_osds (net/ceph/osdmap.c:2617 net/ceph/osdmap.c:2833) calc_target (net/ceph/osd_client.c:1638) __submit_request (net/ceph/osd_client.c:2394) ceph_osdc_start_request (net/ceph/osd_client.c:2490) ceph_osdc_call (net/ceph/osd_client.c:5164) rbd_dev_image_probe (drivers/block/rbd.c:6899) do_rbd_add (drivers/block/rbd.c:7138) ... kernel BUG at net/ceph/osdmap.c:2670! [ idryomov: do the same in __decode_pg_upmap_items() ]

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.7% · 54th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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.

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  • 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.

—

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

    • 4.13affected
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before 66eec4af1e080b695229c9a20635648a6d12fedfaffected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before 4daf06456677177f2a6044729abac59c1b49e87baffected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before d5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1affected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before 42bc06c67d94d5f2a6b33294b0c4b07d8a47c515affected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before ebdf4b4f3b1474079980a2e5cd79ad65fb54db57affected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before 590b07ceea138d49c9b64f65d263aa902d3b4730affected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before e36663145abd7024f0281dfb22fdef65f185845baffected · git
    • a303bb0e58345fe9f7ab2f82b90266f2b5036058 and later · before 9f00f9cf2be293efe899db67dc5272e3a9c62717affected · git
    • before 4.13not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-modules-extrabefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-debug-uki-virtbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-develbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-devel-matchedbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-docbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-headersbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-modulesbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-modules-corebefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-modules-extrabefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-modules-extra-matchedbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-rtbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-rt-64kbefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2
AlmaLinux:10kernel-rt-64k-corebefore 6.12.0-211.58.1.el10_26.12.0-211.58.1.el10_2

+96

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-2026-68157Aug 10, 2026 · libceph: guard missing CRUSH type name lookup
    30Monitor
  • ← EarlierCVE-2026-68158Aug 10, 2026 · libceph: Fix multiplication overflow in decode_new_up_state_weight()
    39Monitor
  • Later →CVE-2026-68160Aug 10, 2026 · ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
    39Monitor

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 Linux42bc06c67d94d5f2a6b33294b0c4b07d8a47c515Vendor (CNA)
Linux Linux4daf06456677177f2a6044729abac59c1b49e87bVendor (CNA)
Linux Linux590b07ceea138d49c9b64f65d263aa902d3b4730Vendor (CNA)
Linux Linux66eec4af1e080b695229c9a20635648a6d12fedfVendor (CNA)
Linux Linux9f00f9cf2be293efe899db67dc5272e3a9c62717Vendor (CNA)
Linux Linuxd5650ddbd4d42c1a916c8fe1a4c4cb573ef810a1Vendor (CNA)
Linux Linuxe36663145abd7024f0281dfb22fdef65f185845bVendor (CNA)
Linux Linuxebdf4b4f3b1474079980a2e5cd79ad65fb54db57Vendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.169.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.169.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-cross-headers6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug-core6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug-devel6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug-devel-matched6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug-modules6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug-modules-core6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-debug-modules-extra6.12.0-211.58.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-rt4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.169.1.rt7.510.el8_10 · AlmaLinux:8Package registry (OSV)

+30

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+1% in 7 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-2026-6453914 days apartBluetooth: eir: Fix stack OOB write when prepending the Flags AD
    31Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

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

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

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