Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2025-38718: sctp: linearize cloned gso packets in sctp_rcv

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.17% (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 03d0cc6889e02420125510b5444b570f4bbf53d5, 1bd5214ea681584c5886fea3ba03e49f93a43c0e, 4506bcaabe004d07be8ff09116a3024fbd6aa965; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1.

Low priority for now. Upgrade to Linux Linux 03d0cc6889e02420125510b5444b570f4bbf53d5, 1bd5214ea681584c5886fea3ba03e49f93a43c0e, 4506bcaabe004d07be8ff09116a3024fbd6aa965; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1 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: sctp: linearize cloned gso packets in sctp_rcv A cloned head skb still shares these frag skbs in fraglist with the original head skb. It's not safe to access these frag skbs. syzbot reported two use-of-uninitialized-memory bugs caused by this: BUG: KMSAN: uninit-value in sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_inq_pop+0x15b7/0x1920 net/sctp/inqueue.c:211 sctp_assoc_bh_rcv+0x1a7/0xc50 net/sctp/associola.c:998 sctp_inq_push+0x2ef/0x380 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x397/0xdb0 net/sctp/input.c:331 sk_backlog_rcv+0x13b/0x420 include/net/sock.h:1122 __release_sock+0x1da/0x330 net/core/sock.c:3106 release_sock+0x6b/0x250 net/core/sock.c:3660 sctp_wait_for_connect+0x487/0x820 net/sctp/socket.c:9360 sctp_sendmsg_to_asoc+0x1ec1/0x1f00 net/sctp/socket.c:1885 sctp_sendmsg+0x32b9/0x4a80 net/sctp/socket.c:2031 inet_sendmsg+0x25a/0x280 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:718 [inline] and BUG: KMSAN: uninit-value in sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_assoc_bh_rcv+0x34e/0xbc0 net/sctp/associola.c:987 sctp_inq_push+0x2a3/0x350 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 sctp_wait_for_connect+0x458/0x820 net/sctp/socket.c:9367 sctp_sendmsg_to_asoc+0x223a/0x2260 net/sctp/socket.c:1886 sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2032 inet_sendmsg+0x269/0x2a0 net/ipv4/af_inet.c:851 sock_sendmsg_nosec net/socket.c:712 [inline] This patch fixes it by linearizing cloned gso packets in sctp_rcv().

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 4, 2025
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

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-2025-38718

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.241
  • linux linux kernel5.11 and later · before 5.15.190
  • linux linux kernel5.16 and later · before 6.6.103
  • linux linux kernel4.8 and later · before 5.4.297
  • linux linux kernel6.13 and later · before 6.15.11
  • linux linux kernel6.16 and later · before 6.16.2
  • linux linux kernel6.7 and later · before 6.12.43
  • linux linux kernel6.17

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

    • 4.8affected
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before d0194e391bb493aa6cec56d177b14df6b29188d5affected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before 03d0cc6889e02420125510b5444b570f4bbf53d5affected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before cd0e92bb2b7542fb96397ffac639b4f5b099d0cbaffected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before 4506bcaabe004d07be8ff09116a3024fbd6aa965affected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before ea094f38d387d1b0ded5dee4a3e5720aa4ce0139affected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before 7d757f17bc2ef2727994ffa6d5d6e4bc4789a770affected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before fc66772607101bd2030a4332b3bd0ea3b3605250affected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before 1bd5214ea681584c5886fea3ba03e49f93a43c0eaffected · git
    • 90017accff61ae89283ad9a51f9ac46ca01633fb and later · before fd60d8a086191fe33c2d719732d2482052fa6805affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-55.38.1.el10_06.12.0-55.38.1.el10_0
AlmaLinux:10kernel-docbefore 6.12.0-55.38.1.el10_06.12.0-55.38.1.el10_0
AlmaLinux:8bpftoolbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.77.1.el8_104.18.0-553.77.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.77.1.rt7.418.el8_104.18.0-553.77.1.rt7.418.el8_10

+96

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-2025-38716Sep 4, 2025 · hfs: fix general protection fault in hfs_find_init()
    22Monitor
  • ← EarlierCVE-2025-38717Sep 4, 2025 · net: kcm: Fix race condition in kcm_unattach()
    18Monitor
  • Later →CVE-2025-38719Sep 4, 2025 · net: hibmcge: fix the division by zero issue
    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 Linux03d0cc6889e02420125510b5444b570f4bbf53d5Vendor (CNA)
Linux Linux1bd5214ea681584c5886fea3ba03e49f93a43c0eVendor (CNA)
Linux Linux4506bcaabe004d07be8ff09116a3024fbd6aa965Vendor (CNA)
Linux Linux7d757f17bc2ef2727994ffa6d5d6e4bc4789a770Vendor (CNA)
Linux Linuxcd0e92bb2b7542fb96397ffac639b4f5b099d0cbVendor (CNA)
Linux Linuxd0194e391bb493aa6cec56d177b14df6b29188d5Vendor (CNA)
Linux Linuxea094f38d387d1b0ded5dee4a3e5720aa4ce0139Vendor (CNA)
Linux Linuxfc66772607101bd2030a4332b3bd0ea3b3605250Vendor (CNA)
Linux Linuxfd60d8a086191fe33c2d719732d2482052fa6805Vendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.05.15.200.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-570.49.1.el9_6 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.162-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.6.1.160000.2.4 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)

+31

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.

No history yet (it accumulates with the daily EPSS job).

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-2024-50302289 days apartHID: core: zero-initialize the report bufferKEV
    52Plan
  • CVE-2026-52989293 days apartnvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
    39Monitor
  • CVE-2026-53225294 days apartsctp: fix uninit-value in __sctp_rcv_asconf_lookup()
    36Monitor
  • CVE-2024-47685318 days apartnetfilter: nf_reject_ipv6: fix nf_reject_ip6_tcphdr_put()
    36Monitor
  • CVE-2026-53170294 days apartaccel/ethosu: reject DMA commands with uninitialized length
    35Monitor
  • CVE-2026-43139244 days apartxfrm6: fix uninitialized saddr in xfrm6_get_saddr()
    34Monitor

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

Weakness class (CWE)

CWE-908 · Use of Uninitialized Resource

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 (9 more)

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

All records