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TI-2026-18680 Aliases CVE-2026-23243GHSA-85rq-57vx-88q2

RDMA/umad: Reject negative data_len in ib_umad_write

Priority LOW 35CWE-190Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 46 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/umad: Reject negative data_len in ib_umad_write ib_umad_write computes data_len from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP header length, data_len can become negative and reach ib_create_send_mad(). This can make the padding calculation exceed the segment size and trigger an out-of-bounds memset in alloc_send_rmpp_list(). Add an explicit check to reject negative data_len before creating the send buffer. KASAN splat: [ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0 [ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102 [ 211.365867] ib_create_send_mad+0xa01/0x11b0 [ 211.365887] ib_umad_write+0x853/0x1c80

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0018 7th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.252, 5.15.202, 6.1.165 +5Red Hat: 16 advisoriesRed Hat: 46 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

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.24 and later5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0Patch availableCNA
  • Linux VendorLinux Affected 2.6.24 and later Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.24.1 to before 5.10.252; 5.11 to before 5.15.202; 5.16 to before 6.1.165; 6.2 to before 6.6.128; 6.7 to before 6.12.75; 6.13 to before 6.18.14; 6.19 to before 6.19.4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:2.6.24:-:*:*:*:*:*:*2.6.24VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.24.1 to before 5.10.252; 5.11 to before 5.15.202; 5.16 to before 6.1.165; 6.2 to before 6.6.128; 6.7 to before 6.12.75; 6.13 to before 6.18.14; 6.19 to before 6.19.4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:2.6.24:-:*:*:*:*:*:* Versions 2.6.24 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0

Red Hat 16 advisories

  • RHSA-2026:41236 Released 2026-07-17 · Red Hat rating Critical
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debug-3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debug-devel-3.10.0-1160.155.1.rt56.1307.el7 +4
  • RHSA-2026:27729 Released 2026-06-22 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.153.1.el7, kernel-3.10.0-1160.153.1.el7, kernel-abi-whitelists-3.10.0-1160.153.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.153.1.el7, kernel-tools-libs-devel-3.10.0-1160.153.1.el7
  • RHSA-2026:26570 Released 2026-06-17 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.196.1.el8_6, kernel-4.18.0-372.196.1.el8_6, kernel-abi-stablelists-4.18.0-372.196.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) bpftool-4.18.0-372.196.1.el8_6, kernel-4.18.0-372.196.1.el8_6, kernel-abi-stablelists-4.18.0-372.196.1.el8_6 +14
Show 13 more Red Hat advisories
  • RHSA-2026:26535 Released 2026-06-17 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.194.1.el8_4, kernel-4.18.0-305.194.1.el8_4, kernel-abi-stablelists-4.18.0-305.194.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.194.1.el8_4, kernel-4.18.0-305.194.1.el8_4, kernel-abi-stablelists-4.18.0-305.194.1.el8_4 +14
  • RHSA-2026:21745 Released 2026-05-28 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-core-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-4.18.0-553.126.1.rt7.467.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-core-4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-4.18.0-553.126.1.rt7.467.el8_10 +7
  • RHSA-2026:21706 Released 2026-05-28 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.126.1.el8_10, kernel-4.18.0-553.126.1.el8_10, kernel-abi-stablelists-4.18.0-553.126.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.126.1.el8_10
  • RHSA-2026:21209 Released 2026-05-27 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.127.1.el9_4, libperf-5.14.0-427.127.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.127.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.127.1.el9_4, kernel-64k-devel-5.14.0-427.127.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.127.1.el9_4, kernel-5.14.0-427.127.1.el9_4, kernel-64k-5.14.0-427.127.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.127.1.el9_4, kernel-rt-core-5.14.0-427.127.1.el9_4, kernel-rt-debug-5.14.0-427.127.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.127.1.el9_4, kernel-rt-core-5.14.0-427.127.1.el9_4, kernel-rt-debug-5.14.0-427.127.1.el9_4 +11
  • RHSA-2026:20593 Released 2026-05-26 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.172.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.172.1.el9_2, kernel-64k-devel-5.14.0-284.172.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.172.1.el9_2, kernel-5.14.0-284.172.1.el9_2, kernel-64k-5.14.0-284.172.1.el9_2 +29
  • RHSA-2026:19875 Released 2026-05-20 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-core-5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-5.14.0-284.172.1.rt14.457.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-core-5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-5.14.0-284.172.1.rt14.457.el9_2 +11
  • RHSA-2026:19521 Released 2026-05-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.143.1.el8_8, kernel-4.18.0-477.143.1.el8_8, kernel-abi-stablelists-4.18.0-477.143.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.143.1.el8_8, kernel-4.18.0-477.143.1.el8_8, kernel-abi-stablelists-4.18.0-477.143.1.el8_8 +14
  • RHSA-2026:18587 Released 2026-05-19 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.5.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.5.1.el9_8, kernel-64k-devel-5.14.0-687.5.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.5.1.el9_8, kernel-64k-5.14.0-687.5.1.el9_8, kernel-64k-core-5.14.0-687.5.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.5.1.el9_8, libperf-5.14.0-687.5.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.5.1.el9_8, kernel-rt-64k-5.14.0-687.5.1.el9_8, kernel-rt-64k-core-5.14.0-687.5.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.5.1.el9_8, kernel-rt-core-5.14.0-687.5.1.el9_8, kernel-rt-debug-5.14.0-687.5.1.el9_8 +9
  • RHSA-2026:18134 Released 2026-05-19 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.7.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.7.1.el10_2, kernel-64k-devel-6.12.0-211.7.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.7.1.el10_2, kernel-64k-6.12.0-211.7.1.el10_2, kernel-64k-core-6.12.0-211.7.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.7.1.el10_2, libperf-6.12.0-211.7.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.7.1.el10_2, kernel-rt-64k-6.12.0-211.7.1.el10_2, kernel-rt-64k-core-6.12.0-211.7.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.7.1.el10_2, kernel-rt-core-6.12.0-211.7.1.el10_2, kernel-rt-debug-6.12.0-211.7.1.el10_2 +9
  • RHSA-2026:15883 Released 2026-05-11 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) kernel-64k-debug-devel-6.12.0-55.72.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.72.1.el10_0, kernel-64k-devel-6.12.0-55.72.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel-6.12.0-55.72.1.el10_0, kernel-64k-6.12.0-55.72.1.el10_0, kernel-64k-core-6.12.0-55.72.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) kernel-tools-libs-devel-6.12.0-55.72.1.el10_0, libperf-6.12.0-55.72.1.el10_0
    • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt-6.12.0-55.72.1.el10_0, kernel-rt-64k-6.12.0-55.72.1.el10_0, kernel-rt-64k-core-6.12.0-55.72.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0) kernel-rt-6.12.0-55.72.1.el10_0, kernel-rt-core-6.12.0-55.72.1.el10_0, kernel-rt-debug-6.12.0-55.72.1.el10_0 +11
  • RHSA-2026:14339 Released 2026-05-06 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.112.1.el9_6, libperf-5.14.0-570.112.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.112.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.112.1.el9_6, kernel-64k-devel-5.14.0-570.112.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.112.1.el9_6, kernel-64k-5.14.0-570.112.1.el9_6, kernel-64k-core-5.14.0-570.112.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.112.1.el9_6, kernel-rt-64k-5.14.0-570.112.1.el9_6, kernel-rt-64k-core-5.14.0-570.112.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.112.1.el9_6, kernel-rt-core-5.14.0-570.112.1.el9_6, kernel-rt-debug-5.14.0-570.112.1.el9_6 +11
  • RHSA-2026:14137 Released 2026-05-06 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-5.14.0-70.178.1.rt21.250.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-5.14.0-70.178.1.rt21.250.el9_0 +7
  • RHSA-2026:13936 Released 2026-05-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.178.1.el9_0, kernel-debug-devel-matched-5.14.0-70.178.1.el9_0, kernel-devel-5.14.0-70.178.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.178.1.el9_0, kernel-5.14.0-70.178.1.el9_0, kernel-abi-stablelists-5.14.0-70.178.1.el9_0 +14

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:14339
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:18134
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:18587
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:13936
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:20593
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:15883
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:14339
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:18134
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:21706
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:18587
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:26535
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:26570
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:19521
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:13936
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:20593
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)Fixed RHSA-2026:15883
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:14339
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:26535
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)Fixed RHSA-2026:26570
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:19521
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:21706
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:18134
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:18587
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:15883
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:21745
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:14137
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:21745
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:18134
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:18587
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:14137
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:19875
Red Hat Enterprise Linux Real Time EUS (v. 10.0)Fixed RHSA-2026:15883
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:14339
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:18134
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:18587
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:19875
Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)Fixed RHSA-2026:15883
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:14339
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:27729
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:27729
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:41236

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23243
  2. 2026-10-03 Alias added: GHSA-85rq-57vx-88q2
  3. 2026-10-19 Weakness changed · CISA ADP

References

Patch 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-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
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

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