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TI-2025-26910 Aliases CVE-2025-40240GHSA-p7wh-phc3-g7xr

sctp: avoid NULL dereference when chunk data buffer is missing

Priority LOW 34Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 48 fixed, 1 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: avoid NULL dereference when chunk data buffer is missing chunk->skb pointer is dereferenced in the if-block where it's supposed to be NULL only. chunk->skb can only be NULL if chunk->head_skb is not. Check for frag_list instead and do it just before replacing chunk->skb. We're sure that otherwise chunk->skb is non-NULL because of outer if() condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00644 51st percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.4.301, 5.10.246, 5.15.196 +5Red Hat: 17 advisoriesRed Hat: 48 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux4.8 and later5.4.301, 5.10.246, 5.15.196, 6.1.158, 6.6.115, 6.12.56, 6.17.6, 6.18Patch availableCNA
  • Linux VendorLinux Affected 4.8 and later Fixed in 5.4.301, 5.10.246, 5.15.196, 6.1.158, 6.6.115, 6.12.56, 6.17.6, 6.18 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.4.301, 5.10.246, 5.15.196, 6.1.158, 6.6.115, 6.12.56, 6.17.6, 6.18

Red Hat 17 advisories

  • RHSA-2026:14925 Released 2026-05-07 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.149.1.el7, kernel-3.10.0-1160.149.1.el7, kernel-abi-whitelists-3.10.0-1160.149.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.149.1.el7, kernel-tools-libs-devel-3.10.0-1160.149.1.el7
  • RHSA-2026:14869 Released 2026-05-07 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.149.1.rt56.1301.el7, kernel-rt-debug-3.10.0-1160.149.1.rt56.1301.el7, kernel-rt-debug-devel-3.10.0-1160.149.1.rt56.1301.el7 +4
  • RHSA-2026:7003 Released 2026-04-08 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.188.1.el8_4, kernel-4.18.0-305.188.1.el8_4, kernel-abi-stablelists-4.18.0-305.188.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.188.1.el8_4, kernel-4.18.0-305.188.1.el8_4, kernel-abi-stablelists-4.18.0-305.188.1.el8_4 +14
Show 14 more Red Hat advisories
  • RHSA-2026:5813 Released 2026-03-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.161.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.161.1.el9_2, kernel-64k-devel-5.14.0-284.161.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.161.1.el9_2, kernel-5.14.0-284.161.1.el9_2, kernel-64k-5.14.0-284.161.1.el9_2 +29
  • RHSA-2026:5732 Released 2026-03-25 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.171.1.rt21.243.el9_0, kernel-rt-core-5.14.0-70.171.1.rt21.243.el9_0, kernel-rt-debug-5.14.0-70.171.1.rt21.243.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.171.1.rt21.243.el9_0, kernel-rt-core-5.14.0-70.171.1.rt21.243.el9_0, kernel-rt-debug-5.14.0-70.171.1.rt21.243.el9_0 +7
  • RHSA-2026:5727 Released 2026-03-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.190.1.el8_2, kernel-4.18.0-193.190.1.el8_2, kernel-abi-whitelists-4.18.0-193.190.1.el8_2 +14
  • RHSA-2026:5691 Released 2026-03-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.185.1.el8_6, kernel-4.18.0-372.185.1.el8_6, kernel-abi-stablelists-4.18.0-372.185.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.185.1.el8_6, kernel-4.18.0-372.185.1.el8_6, kernel-abi-stablelists-4.18.0-372.185.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.185.1.el8_6, kernel-4.18.0-372.185.1.el8_6, kernel-abi-stablelists-4.18.0-372.185.1.el8_6 +14
  • RHSA-2026:5693 Released 2026-03-25 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.171.1.el9_0, kernel-debug-devel-matched-5.14.0-70.171.1.el9_0, kernel-devel-5.14.0-70.171.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.171.1.el9_0, kernel-5.14.0-70.171.1.el9_0, kernel-abi-stablelists-5.14.0-70.171.1.el9_0 +14
  • RHSA-2026:5690 Released 2026-03-25 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.161.1.rt14.446.el9_2, kernel-rt-core-5.14.0-284.161.1.rt14.446.el9_2, kernel-rt-debug-5.14.0-284.161.1.rt14.446.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.161.1.rt14.446.el9_2, kernel-rt-core-5.14.0-284.161.1.rt14.446.el9_2, kernel-rt-debug-5.14.0-284.161.1.rt14.446.el9_2 +11
  • RHSA-2026:4899 Released 2026-03-18 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.115.1.el9_4, libperf-5.14.0-427.115.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.115.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.115.1.el9_4, kernel-64k-devel-5.14.0-427.115.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.115.1.el9_4, kernel-5.14.0-427.115.1.el9_4, kernel-64k-5.14.0-427.115.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.115.1.el9_4, kernel-rt-core-5.14.0-427.115.1.el9_4, kernel-rt-debug-5.14.0-427.115.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.115.1.el9_4, kernel-rt-core-5.14.0-427.115.1.el9_4, kernel-rt-debug-5.14.0-427.115.1.el9_4 +11
  • RHSA-2026:4745 Released 2026-03-17 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.98.1.el9_6, libperf-5.14.0-570.98.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.98.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.98.1.el9_6, kernel-64k-devel-5.14.0-570.98.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.98.1.el9_6, kernel-64k-5.14.0-570.98.1.el9_6, kernel-64k-core-5.14.0-570.98.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.98.1.el9_6, kernel-rt-64k-5.14.0-570.98.1.el9_6, kernel-rt-64k-core-5.14.0-570.98.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.98.1.el9_6, kernel-rt-core-5.14.0-570.98.1.el9_6, kernel-rt-debug-5.14.0-570.98.1.el9_6 +11
  • RHSA-2026:2535 Released 2026-02-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.128.1.el8_8, kernel-4.18.0-477.128.1.el8_8, kernel-abi-stablelists-4.18.0-477.128.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.128.1.el8_8, kernel-4.18.0-477.128.1.el8_8, kernel-abi-stablelists-4.18.0-477.128.1.el8_8 +14
  • RHSA-2026:1727 Released 2026-02-02 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.58.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.58.1.el10_0, kernel-64k-devel-6.12.0-55.58.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.58.1.el10_0, kernel-64k-6.12.0-55.58.1.el10_0, kernel-64k-core-6.12.0-55.58.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.58.1.el10_0, libperf-6.12.0-55.58.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.58.1.el10_0, kernel-rt-64k-6.12.0-55.58.1.el10_0, kernel-rt-64k-core-6.12.0-55.58.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.58.1.el10_0, kernel-rt-core-6.12.0-55.58.1.el10_0, kernel-rt-debug-6.12.0-55.58.1.el10_0 +11
  • RHSA-2026:0453 Released 2026-01-12 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.27.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.27.1.el10_1, kernel-64k-devel-6.12.0-124.27.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.27.1.el10_1, kernel-64k-6.12.0-124.27.1.el10_1, kernel-64k-core-6.12.0-124.27.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.27.1.el10_1, libperf-6.12.0-124.27.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.27.1.el10_1, kernel-rt-64k-6.12.0-124.27.1.el10_1, kernel-rt-64k-core-6.12.0-124.27.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.27.1.el10_1, kernel-rt-core-6.12.0-124.27.1.el10_1, kernel-rt-debug-6.12.0-124.27.1.el10_1 +9
  • RHSA-2026:0445 Released 2026-01-12 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.20.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.20.1.el9_7, kernel-64k-devel-5.14.0-611.20.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.20.1.el9_7, kernel-64k-5.14.0-611.20.1.el9_7, kernel-64k-core-5.14.0-611.20.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.20.1.el9_7, libperf-5.14.0-611.20.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.20.1.el9_7, kernel-rt-64k-5.14.0-611.20.1.el9_7, kernel-rt-64k-core-5.14.0-611.20.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.20.1.el9_7, kernel-rt-core-5.14.0-611.20.1.el9_7, kernel-rt-debug-5.14.0-611.20.1.el9_7 +9
  • RHSA-2026:0444 Released 2026-01-12 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.92.1.el8_10, kernel-4.18.0-553.92.1.el8_10, kernel-abi-stablelists-4.18.0-553.92.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.92.1.el8_10
  • RHSA-2026:0443 Released 2026-01-12 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.92.1.rt7.433.el8_10, kernel-rt-core-4.18.0-553.92.1.rt7.433.el8_10, kernel-rt-debug-4.18.0-553.92.1.rt7.433.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.92.1.rt7.433.el8_10, kernel-rt-core-4.18.0-553.92.1.rt7.433.el8_10, kernel-rt-debug-4.18.0-553.92.1.rt7.433.el8_10 +7

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:4899
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:4745
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:0445
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:5693
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:5813
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:4899
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:4745
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:0444
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:0445
Red Hat Enterprise Linux BaseOS AUS (v. 8.2)Fixed RHSA-2026:5727
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:7003
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:5691
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2026:5691
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:2535
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:5693
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:5813
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:4899
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:4745
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:7003
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2026:5691
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:2535
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:0444
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:0445
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:0443
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:5732
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:0443
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:0445
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:5732
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:5690
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:4899
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:4745
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:0453
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:0445
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:5690
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:1727
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:4899
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:4745
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:14925
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:14925
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:14869
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux BaseOS (v. 8)
  • Red Hat Enterprise Linux CRB (v. 8)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40240
  2. 2026-10-03 Alias added: GHSA-p7wh-phc3-g7xr
  3. 2026-11-01 Affected versions changed · Red Hat
  4. 2026-11-04 EPSS moved to the 50th–90th percentile

References

Other 8

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2021-02452 Incorrect authorization in Ubuntu linux kernel KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
See all 21741 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences