sctp: fix race between sctp_wait_for_connect and peeloff
Priority LOW 35CWE-362Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 16 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix race between sctp_wait_for_connect and peeloff sctp_wait_for_connect() drops and re-acquires the socket lock while waiting for the association to reach ESTABLISHED state. During this window, another thread can peeloff the association to a new socket via getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After re-acquiring the old socket lock, sctp_wait_for_connect() returns success without noticing the migration — the caller then accesses the association under the wrong lock in sctp_datamsg_from_user(). Add the same sk != asoc->base.sk check that sctp_wait_for_sndbuf() already has, returning an error if the association was migrated while we slept.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00131 2nd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.259, 5.15.210, 6.1.176 +5Red Hat: 4 advisoriesRed Hat: 16 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.16 and later | 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1 | Patch available | CNA |
- Linux VendorLinux Affected 4.16 and later Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.16 to before 5.10.259; 5.11 to before 5.15.210; 5.16 to before 6.1.176; 6.2 to before 6.6.143; 6.7 to before 6.12.93; 6.13 to before 6.18.35; 6.19 to before 7.0.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | 7.1 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | 7.1 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | 7.1 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | 7.1 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | 7.1 rc5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.16 to before 5.10.259; 5.11 to before 5.15.210; 5.16 to before 6.1.176; 6.2 to before 6.6.143; 6.7 to before 6.12.93; 6.13 to before 6.18.35; 6.19 to before 7.0.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* Versions 7.1 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* Versions 7.1 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* Versions 7.1 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* Versions 7.1 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* Versions 7.1 rc5 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1
Red Hat 4 advisories
- RHSA-2026:85321 Released 2026-10-19 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- 10Base-SMTV kernel-modules-internal-6.12.0-211.67.1.el10_2
- Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.67.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.67.1.el10_2, kernel-64k-devel-6.12.0-211.67.1.el10_2 +12
- Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.67.1.el10_2, kernel-64k-6.12.0-211.67.1.el10_2, kernel-64k-core-6.12.0-211.67.1.el10_2 +29
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.67.1.el10_2, libperf-6.12.0-211.67.1.el10_2
- Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.67.1.el10_2
- Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.67.1.el10_2, kernel-rt-64k-6.12.0-211.67.1.el10_2, kernel-rt-64k-core-6.12.0-211.67.1.el10_2 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.67.1.el10_2, kernel-rt-core-6.12.0-211.67.1.el10_2, kernel-rt-debug-6.12.0-211.67.1.el10_2 +9
- RHSA-2026:67150 Released 2026-09-14 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.47.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.47.1.el9_8, kernel-64k-devel-5.14.0-687.47.1.el9_8 +12
- Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.47.1.el9_8, kernel-64k-5.14.0-687.47.1.el9_8, kernel-64k-core-5.14.0-687.47.1.el9_8 +28
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.47.1.el9_8, libperf-5.14.0-687.47.1.el9_8
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.47.1.el9_8, kernel-rt-64k-5.14.0-687.47.1.el9_8, kernel-rt-64k-core-5.14.0-687.47.1.el9_8 +21
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.47.1.el9_8, kernel-rt-core-5.14.0-687.47.1.el9_8, kernel-rt-debug-5.14.0-687.47.1.el9_8 +9
- RHSA-2026:66325 Released 2026-09-10 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.162.1.el8_10, kernel-4.18.0-553.162.1.el8_10, kernel-abi-stablelists-4.18.0-553.162.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.162.1.el8_10
Show 1 more Red Hat advisories
- RHSA-2026:66324 Released 2026-09-10 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-core-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-debug-4.18.0-553.162.1.rt7.503.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-core-4.18.0-553.162.1.rt7.503.el8_10, kernel-rt-debug-4.18.0-553.162.1.rt7.503.el8_10 +7
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| 10Base-SMTV | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:66325 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2026:66325 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux Hidden (v. 10) | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2026:66324 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2026:66324 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2026:67150 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2026:85321 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2026:67150 |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63971
- 2026-10-03 Alias added: GHSA-p8fw-9cj8-hc3p
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-19 Weakness changed · CISA ADP
- 2026-10-20 Fix available: RHSA-2026:85321 · Red Hat
- 2026-10-20 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) +4 · Red Hat
- 2026-10-31 CVSS score changed · Red Hat
References
Patch 8
- https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d
- https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5
- https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549
- https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb
- https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21
- https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e
- https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb
- https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e
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Sources
- CVE-2026-63971 · CVE Program
- CVE-2026-63971 · NVD
- FIRST EPSS
- GHSA-p8fw-9cj8-hc3p · GitHub Advisory Database · CC BY 4.0
- CVE-2026-63971 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences