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TI-2024-17699 Aliases CVE-2024-26826GHSA-vfr6-9rmm-7rvg

mptcp: fix data re-injection from stale subflow

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: 19 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: mptcp: fix data re-injection from stale subflow When the MPTCP PM detects that a subflow is stale, all the packet scheduler must re-inject all the mptcp-level unacked data. To avoid acquiring unneeded locks, it first try to check if any unacked data is present at all in the RTX queue, but such check is currently broken, as it uses TCP-specific helper on an MPTCP socket. Funnily enough fuzzers and static checkers are happy, as the accessed memory still belongs to the mptcp_sock struct, and even from a functional perspective the recovery completed successfully, as the short-cut test always failed. A recent unrelated TCP change - commit d5fed5addb2b ("tcp: reorganize tcp_sock fast path variables") - exposed the issue, as the tcp field reorganization makes the mptcp code always skip the re-inection. Fix the issue dropping the bogus call: we are on a slow path, the early optimization proved once again to be evil.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00651 51st percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.15.149, 6.1.79, 6.6.18 +2Red Hat: 7 advisoriesRed Hat: 19 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
LinuxLinux5.15 and later5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8Patch availableCNA
  • Linux VendorLinux Affected 5.15 and later Fixed in 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.15 to before 5.15.149; 5.16 to before 6.1.79; 6.2 to before 6.6.18; 6.7 to before 6.7.6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*6.8 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*6.8 rc2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.15 to before 5.15.149; 5.16 to before 6.1.79; 6.2 to before 6.6.18; 6.7 to before 6.7.6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:* Versions 6.8 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:* Versions 6.8 rc2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.15.149, 6.1.79, 6.6.18, 6.7.6, 6.8

Red Hat 7 advisories

  • RHSA-2024:8617 Released 2024-10-30 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-427.42.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.42.1.el9_4, kernel-64k-devel-5.14.0-427.42.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.3.0-427.42.1.el9_4, kernel-5.14.0-427.42.1.el9_4, kernel-64k-5.14.0-427.42.1.el9_4 +29
    • Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-427.42.1.el9_4, libperf-5.14.0-427.42.1.el9_4
    • Red Hat Enterprise Linux NFV (v. 9) kernel-rt-5.14.0-427.42.1.el9_4, kernel-rt-core-5.14.0-427.42.1.el9_4, kernel-rt-debug-5.14.0-427.42.1.el9_4 +11
    • Red Hat Enterprise Linux RT (v. 9) kernel-rt-5.14.0-427.42.1.el9_4, kernel-rt-core-5.14.0-427.42.1.el9_4, kernel-rt-debug-5.14.0-427.42.1.el9_4 +9
  • RHSA-2024:8613 Released 2024-10-30 · Red Hat rating Moderate
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-tools-libs-devel-5.14.0-284.90.1.el9_2
    • Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-64k-debug-devel-5.14.0-284.90.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.90.1.el9_2, kernel-64k-devel-5.14.0-284.90.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool-7.0.0-284.90.1.el9_2, kernel-5.14.0-284.90.1.el9_2, kernel-64k-5.14.0-284.90.1.el9_2 +29
  • RHSA-2024:8614 Released 2024-10-30 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt-5.14.0-284.90.1.rt14.375.el9_2, kernel-rt-core-5.14.0-284.90.1.rt14.375.el9_2, kernel-rt-debug-5.14.0-284.90.1.rt14.375.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt-5.14.0-284.90.1.rt14.375.el9_2, kernel-rt-core-5.14.0-284.90.1.rt14.375.el9_2, kernel-rt-debug-5.14.0-284.90.1.rt14.375.el9_2 +11
Show 4 more Red Hat advisories
  • RHSA-2024:6993 Released 2024-09-24 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-tools-libs-devel-4.18.0-477.74.1.el8_8
    • Red Hat Enterprise Linux BaseOS EUS (v.8.8) bpftool-4.18.0-477.74.1.el8_8, kernel-4.18.0-477.74.1.el8_8, kernel-abi-stablelists-4.18.0-477.74.1.el8_8 +19
  • RHSA-2024:5065 Released 2024-08-07 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.115.1.el8_6, kernel-4.18.0-372.115.1.el8_6, kernel-abi-stablelists-4.18.0-372.115.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.115.1.el8_6, kernel-4.18.0-372.115.1.el8_6, kernel-abi-stablelists-4.18.0-372.115.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.115.1.el8_6, kernel-4.18.0-372.115.1.el8_6, kernel-abi-stablelists-4.18.0-372.115.1.el8_6 +14
  • RHSA-2024:4352 Released 2024-07-08 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.8.1.rt7.349.el8_10, kernel-rt-core-4.18.0-553.8.1.rt7.349.el8_10, kernel-rt-debug-4.18.0-553.8.1.rt7.349.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.8.1.rt7.349.el8_10, kernel-rt-core-4.18.0-553.8.1.rt7.349.el8_10, kernel-rt-debug-4.18.0-553.8.1.rt7.349.el8_10 +7
  • RHSA-2024:4211 Released 2024-07-02 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.8.1.el8_10, kernel-4.18.0-553.8.1.el8_10, kernel-abi-stablelists-4.18.0-553.8.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.8.1.el8_10

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
Red Hat CodeReady Linux Builder EUS (v.8.8)Fixed RHSA-2024:6993
Red Hat CodeReady Linux Builder EUS (v.9.2)Fixed RHSA-2024:8613
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2024:8617
Red Hat Enterprise Linux AppStream EUS (v.9.2)Fixed RHSA-2024:8613
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2024:4211
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2024:8617
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2024:5065
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2024:5065
Red Hat Enterprise Linux BaseOS EUS (v.8.8)Fixed RHSA-2024:6993
Red Hat Enterprise Linux BaseOS EUS (v.9.2)Fixed RHSA-2024:8613
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2024:5065
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2024:4211
Red Hat Enterprise Linux CRB (v. 9)Fixed RHSA-2024:8617
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2024:4352
Red Hat Enterprise Linux NFV (v. 9)Fixed RHSA-2024:8617
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2024:4352
Red Hat Enterprise Linux RT (v. 9)Fixed RHSA-2024:8617
Red Hat Enterprise Linux Real Time EUS (v.9.2)Fixed RHSA-2024:8614
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2)Fixed RHSA-2024:8614
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux AppStream EUS (v.9.2)
  • Red Hat Enterprise Linux BaseOS (v. 8)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-26826
  2. 2026-10-03 Alias added: GHSA-vfr6-9rmm-7rvg
  3. 2026-10-14 EPSS moved to the 50th–90th percentile

References

Patch 5

  • 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