CVE-2026-74587: sctp: fix use-after-free of cached ASCONF chunk
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: 0.50% (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 07daf4f9750104960a1d60831b2353c0d41f35fb, 10459b03e2d9ee12435e96f587de4d4cacdbf435, 179676f0166230c80053a392303485b37c93dd33; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 07daf4f9750104960a1d60831b2353c0d41f35fb, 10459b03e2d9ee12435e96f587de4d4cacdbf435, 179676f0166230c80053a392303485b37c93dd33; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 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: fix use-after-free of cached ASCONF chunk addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal ASCONF-ACK completion path releases the chunk and clears the pointer. However, sctp_asconf_queue_teardown() releases the cached chunk without clearing addip_last_asconf. During peer restart handling, sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes sctp_asconf_queue_teardown() while the association remains alive and leaves the pointer dangling. A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(), which accesses the stale chunk and passes it to sctp_process_asconf_ack(), causing a use-after-free and a second release. Clearing the pointer exposes a race with T4 expiry. Peer restart handling queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses timer_delete(), which does not wait for a callback already running on another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after the purge and dereference NULL. Clear addip_last_asconf after releasing the cached chunk, and make sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding ASCONF remains.
- Published
- Aug 22, 2026
- Updated
- Oct 16, 2026
- EPSS
- 0.5% · 43th percentile
- CWE
- —
Report tools
Action score
39
Monitor
Low priority for now.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
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.
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.
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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.
We use this product, ask for helpAffected 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
- 3.0affected
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before 10459b03e2d9ee12435e96f587de4d4cacdbf435affected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before e1bb114e09372fd6e03387ced9ef566da336ed6caffected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before 179676f0166230c80053a392303485b37c93dd33affected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before dc67d528c2fa939cec7fe3bf7f3089c8d281ca3daffected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before 618b5c6d049896fcfabb91afc072954c92cb2693affected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before 07daf4f9750104960a1d60831b2353c0d41f35fbaffected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before d949992bc3f00027a2c755e860a11950c75f6073affected · git
- a000c01e60e40e15304ffe48fff051d17a7bea91 and later · before 8c283e7b56adce00193837f3311b06662466fb21affected · git
- before 3.0not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.107-1~deb12u1 | 6.12.107-1~deb12u1 |
| Debian:13 | linux | before 6.12.105-1 | 6.12.105-1 |
| Debian:14 | linux | before 7.1.9-1 | 7.1.9-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_61 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_47 | before 1-150500.11.3.1 | 1-150500.11.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.143.1 | 6.4.0-150600.23.143.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_33 | before 1-150600.13.5.1 | 1-150600.13.5.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.246.1.150400.24.124.1 | 5.14.21-150400.24.246.1.150400.24.124.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source | before 5.14.21-150400.24.246.1 | 5.14.21-150400.24.246.1 |
| SUSE:Linux Enterprise Micro 5.4 | kernel-rt | before 5.14.21-150400.15.192.2 | 5.14.21-150400.15.192.2 |
| SUSE:Linux Enterprise Micro 5.4 | kernel-source-rt | before 5.14.21-150400.15.192.2 | 5.14.21-150400.15.192.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.195.1 | 5.14.21-150500.55.195.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.195.1.150500.6.91.1 | 5.14.21-150500.55.195.1.150500.6.91.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.167.2 | 5.14.21-150500.13.167.2 |
+18
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-74585Aug 22, 2026 · thunderbolt: Bound the DROM dual link port number before indexing sw->ports0Monitor
- ← EarlierCVE-2026-74586Aug 22, 2026 · sctp: clear new_transport when removing a peer39Monitor
- Later →CVE-2026-74588Aug 22, 2026 · sctp: keep chunk->transport in step with the list it is queued on39Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 07daf4f9750104960a1d60831b2353c0d41f35fb | Vendor (CNA) |
| Linux Linux | 10459b03e2d9ee12435e96f587de4d4cacdbf435 | Vendor (CNA) |
| Linux Linux | 179676f0166230c80053a392303485b37c93dd33 | Vendor (CNA) |
| Linux Linux | 618b5c6d049896fcfabb91afc072954c92cb2693 | Vendor (CNA) |
| Linux Linux | 8c283e7b56adce00193837f3311b06662466fb21 | Vendor (CNA) |
| Linux Linux | d949992bc3f00027a2c755e860a11950c75f6073 | Vendor (CNA) |
| Linux Linux | dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d | Vendor (CNA) |
| Linux Linux | e1bb114e09372fd6e03387ced9ef566da336ed6c | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | 6.6.152.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.107-1~deb12u1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-default | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-default-base | 6.4.0-150600.23.143.1.150600.12.66.3 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-docs | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-ec2 | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_33 | 1-150600.13.5.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package registry (OSV) |
| suse:kernel-source | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-syms | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-trace | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-xen | 3.0.101-108.226.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Package registry (OSV) |
| suse:kernel-zfcpdump | 6.4.0-150600.23.143.1 · SUSE:Linux Enterprise Server 15 SP6-LTSS | Package 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.
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 researchersFinders, 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.
No nightly-computed relations.
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.
- TR-26-0893 · Aug 24, 2026(Linux Kernel Güvenlik Bildirimi)
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)
—
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
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/10459b03e2d9ee12435e96f587de4d4cacdbf435
- git.kernel.org/stable/c/179676f0166230c80053a392303485b37c93dd33
- git.kernel.org/stable/c/618b5c6d049896fcfabb91afc072954c92cb2693
- git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21
- git.kernel.org/stable/c/d949992bc3f00027a2c755e860a11950c75f6073
- git.kernel.org/stable/c/dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d
- git.kernel.org/stable/c/e1bb114e09372fd6e03387ced9ef566da336ed6c
Vendor advisories and official records. Exploit/PoC links are deliberately left out.