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Fencer Vulns
high 8.1

CVE-2024-46858 json

mptcp: pm: Fix uaf in __timer_delete_sync

published 2024-09-27 2 y ago modified 2026-08-05 3 mo ago also EUVD-2024-42119

cvss
8.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

mptcp: pm: Fix uaf in __timer_delete_sync

There are two paths to access mptcp_pm_del_add_timer, result in a race condition:

CPU1 CPU2 ==== ==== net_rx_action napi_poll netlink_sendmsg __napi_poll netlink_unicast process_backlog netlink_unicast_kernel __netif_receive_skb genl_rcv __netif_receive_skb_one_core netlink_rcv_skb NF_HOOK genl_rcv_msg ip_local_deliver_finish genl_family_rcv_msg ip_protocol_deliver_rcu genl_family_rcv_msg_doit tcp_v4_rcv mptcp_pm_nl_flush_addrs_doit tcp_v4_do_rcv mptcp_nl_remove_addrs_list tcp_rcv_established mptcp_pm_remove_addrs_and_subflows tcp_data_queue remove_anno_list_by_saddr mptcp_incoming_options mptcp_pm_del_add_timer mptcp_pm_del_add_timer kfree(entry)

In remove_anno_list_by_saddr(running on CPU2), after leaving the critical zone protected by "pm.lock", the entry will be released, which leads to the occurrence of uaf in the mptcp_pm_del_add_timer(running on CPU1).

Keeping a reference to add_timer inside the lock, and calling sk_stop_timer_sync() with this reference, instead of "entry->add_timer".

Move list_del(&entry->list) to mptcp_pm_del_add_timer and inside the pm lock, do not directly access any members of the entry outside the pm lock, which can avoid similar "entry->x" uaf.

Patch / fix

  • Linux Linux 5.10.227, 5.15.168, 6.1.111, 6.6.52, 6.10.11, 6.11
  • linux Debian 12 6.1.112-1
  • linux Debian 14, Debian 13 6.10.11-1

debian advisories DEBIAN-CVE-2024-46858

  • linux Ubuntu 22.04 LTS 5.15.0-127.137
  • linux Ubuntu 24.04 LTS 6.8.0-50.51
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1073.79
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1020.22
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1072.80
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1019.21
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1070.76
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1015.19

ubuntu advisories UBUNTU-CVE-2024-46858

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perf RHEL 8 4.18.0-553.30.1.el8_10
  • kernel RHEL 8 4.18.0-553.30.1.el8_10
  • bpftool RHEL 8 4.18.0-553.30.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.30.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.30.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.30.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.30.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.30.1.el8_10

red hat advisories RHSA-2024:10281RHSA-2024:10265RHSA-2024:10262RHSA-2024:9942RHSA-2024:9943RHSA-2024:9605

  • kernel-source Linux Micro 6.1, Linux Micro 6.0 6.4.0-28.1
  • kernel-default Linux Micro 6.1, Linux Micro 6.0 6.4.0-28.1
  • kernel-kvmsmall Linux Micro 6.1, Linux Micro 6.0 6.4.0-28.1
  • kernel-default-base Linux Micro 6.1, Linux Micro 6.0 6.4.0-28.1.21.6
  • kernel-livepatch-MICRO-6-0_Update_6 Linux Micro 6.1, Linux Micro 6.0 1-3.1
  • kernel-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-28.1
  • kernel-source-rt Linux Micro 6.1, Linux Micro 6.0 6.4.0-28.1
  • kernel-livepatch-MICRO-6-0-RT_Update_6 Linux Micro 6.1, Linux Micro 6.0 1-3.1

suse advisories SUSE-SU-2025:20192-1SUSE-SU-2025:20270-1SUSE-SU-2025:20190-1SUSE-SU-2025:20260-1SUSE-SU-2025:0847-1SUSE-SU-2025:0577-1

  • perf AlmaLinux 8 4.18.0-553.30.1.el8_10
  • kernel AlmaLinux 8 4.18.0-553.30.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.30.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.30.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.30.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.30.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.30.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.30.1.el8_10

almalinux advisories ALSA-2024:10281ALSA-2024:9605

  • kernel Rocky Linux 8 4.18.0-553.30.1.el8_10

rocky linux advisories RLSA-2024:10281

  • kernel Azure Linux 3.0 6.6.56.1-5

azure linux advisories AZL-49785

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-46858 updated cvss 7.0

kernel: mptcp: pm: Fix uaf in __timer_delete_sync

  • Red Hat Enterprise Linux 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: no fix available
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-503.14.1.el9_5, kernel-debuginfo-common-s390x 5.14.0-503.14.1.el9_5, kernel-debuginfo-common-x86_64 5.14.0-503.14.1.el9_5, kernel-debuginfo-common-aarch64 5.14.0-503.14.1.el9_5, kernel-debuginfo-common-ppc64le 5.14.0-503.14.1.el9_5
    fixed: vendor fix RHSA-2024:9605
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.81.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.81.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.81.1.el8_8
    fixed: vendor fix RHSA-2024:10262
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.92.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.92.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.92.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.92.1.el9_2
    fixed: vendor fix RHSA-2024:9497
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.44.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.44.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.44.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.44.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.44.1.el9_4
    fixed: vendor fix RHSA-2024:9546
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-503.14.1.el9_5, perf 5.14.0-503.14.1.el9_5, rtla 5.14.0-503.14.1.el9_5, kernel-devel-matched 5.14.0-503.14.1.el9_5, kernel-64k-devel-matched 5.14.0-503.14.1.el9_5, kernel-debug-devel-matched 5.14.0-503.14.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:9605
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.121.1.el9_0, kernel-devel-matched 5.14.0-70.121.1.el9_0, kernel-debug-devel-matched 5.14.0-70.121.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.121.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.121.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.121.1.el9_0, +2 more
    fixed: vendor fix RHSA-2024:9942
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.92.1.el9_2, rtla 5.14.0-284.92.1.el9_2, kernel-devel-matched 5.14.0-284.92.1.el9_2, kernel-64k-devel-matched 5.14.0-284.92.1.el9_2, kernel-debug-devel-matched 5.14.0-284.92.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.92.1.el9_2, +5 more
    fixed: vendor fix RHSA-2024:9497
show 23 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.44.1.el9_4, perf 5.14.0-427.44.1.el9_4, rtla 5.14.0-427.44.1.el9_4, kernel-devel-matched 5.14.0-427.44.1.el9_4, kernel-64k-devel-matched 5.14.0-427.44.1.el9_4, kernel-debug-devel-matched 5.14.0-427.44.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:9546
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.30.1.el8_10, kernel 4.18.0-553.30.1.el8_10, bpftool 4.18.0-553.30.1.el8_10, kernel-core 4.18.0-553.30.1.el8_10, kernel-tools 4.18.0-553.30.1.el8_10, python3-perf 4.18.0-553.30.1.el8_10, +15 more
    fixed: vendor fix RHSA-2024:10281
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.4.0-503.14.1.el9_5, kernel 5.14.0-503.14.1.el9_5, kernel-64k 5.14.0-503.14.1.el9_5, kernel-core 5.14.0-503.14.1.el9_5, kernel-tools 5.14.0-503.14.1.el9_5, python3-perf 5.14.0-503.14.1.el9_5, +29 more
    fixed: vendor fix RHSA-2024:9605
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.145.1.el8_4, kernel 4.18.0-305.145.1.el8_4, bpftool 4.18.0-305.145.1.el8_4, kernel-core 4.18.0-305.145.1.el8_4, kernel-tools 4.18.0-305.145.1.el8_4, python3-perf 4.18.0-305.145.1.el8_4, +8 more
    fixed: vendor fix RHSA-2024:10265
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.129.1.el8_6, kernel 4.18.0-372.129.1.el8_6, bpftool 4.18.0-372.129.1.el8_6, kernel-core 4.18.0-372.129.1.el8_6, kernel-tools 4.18.0-372.129.1.el8_6, python3-perf 4.18.0-372.129.1.el8_6, +8 more
    fixed: vendor fix RHSA-2024:9500
  • Red Hat Enterprise Linux BaseOS E4S (v.8.4) perf 4.18.0-305.145.1.el8_4, kernel 4.18.0-305.145.1.el8_4, bpftool 4.18.0-305.145.1.el8_4, kernel-core 4.18.0-305.145.1.el8_4, kernel-tools 4.18.0-305.145.1.el8_4, python3-perf 4.18.0-305.145.1.el8_4, +9 more
    fixed: vendor fix RHSA-2024:10265
  • Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.129.1.el8_6, kernel 4.18.0-372.129.1.el8_6, bpftool 4.18.0-372.129.1.el8_6, kernel-core 4.18.0-372.129.1.el8_6, kernel-tools 4.18.0-372.129.1.el8_6, python3-perf 4.18.0-372.129.1.el8_6, +15 more
    fixed: vendor fix RHSA-2024:9500
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.121.1.el9_0, bpftool 5.14.0-70.121.1.el9_0, kernel-core 5.14.0-70.121.1.el9_0, kernel-tools 5.14.0-70.121.1.el9_0, python3-perf 5.14.0-70.121.1.el9_0, kernel-modules 5.14.0-70.121.1.el9_0, +14 more
    fixed: vendor fix RHSA-2024:9942
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.81.1.el8_8, kernel 4.18.0-477.81.1.el8_8, bpftool 4.18.0-477.81.1.el8_8, kernel-core 4.18.0-477.81.1.el8_8, kernel-tools 4.18.0-477.81.1.el8_8, python3-perf 4.18.0-477.81.1.el8_8, +15 more
    fixed: vendor fix RHSA-2024:10262
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.92.1.el9_2, kernel 5.14.0-284.92.1.el9_2, kernel-64k 5.14.0-284.92.1.el9_2, kernel-core 5.14.0-284.92.1.el9_2, kernel-tools 5.14.0-284.92.1.el9_2, python3-perf 5.14.0-284.92.1.el9_2, +28 more
    fixed: vendor fix RHSA-2024:9497
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.44.1.el9_4, kernel 5.14.0-427.44.1.el9_4, kernel-64k 5.14.0-427.44.1.el9_4, kernel-core 5.14.0-427.44.1.el9_4, kernel-tools 5.14.0-427.44.1.el9_4, python3-perf 5.14.0-427.44.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:9546
  • Red Hat Enterprise Linux BaseOS TUS (v.8.4) perf 4.18.0-305.145.1.el8_4, kernel 4.18.0-305.145.1.el8_4, bpftool 4.18.0-305.145.1.el8_4, kernel-core 4.18.0-305.145.1.el8_4, kernel-tools 4.18.0-305.145.1.el8_4, python3-perf 4.18.0-305.145.1.el8_4, +8 more
    fixed: vendor fix RHSA-2024:10265
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.129.1.el8_6, kernel 4.18.0-372.129.1.el8_6, bpftool 4.18.0-372.129.1.el8_6, kernel-core 4.18.0-372.129.1.el8_6, kernel-tools 4.18.0-372.129.1.el8_6, python3-perf 4.18.0-372.129.1.el8_6, +8 more
    fixed: vendor fix RHSA-2024:9500
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.30.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.30.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.30.1.el8_10
    fixed: vendor fix RHSA-2024:10281
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-kvm 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-core 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-modules 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-debug-kvm 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-debug-core 5.14.0-70.121.1.rt21.193.el9_0, +4 more
    fixed: vendor fix RHSA-2024:9943
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-503.14.1.el9_5, kernel-rt-core 5.14.0-503.14.1.el9_5, kernel-rt-modules 5.14.0-503.14.1.el9_5, kernel-rt-debug-core 5.14.0-503.14.1.el9_5, kernel-rt-modules-core 5.14.0-503.14.1.el9_5, kernel-rt-debug-modules 5.14.0-503.14.1.el9_5, +4 more
    fixed: vendor fix RHSA-2024:9605
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-core 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-modules 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-debug-core 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-debug-modules 5.14.0-70.121.1.rt21.193.el9_0, kernel-rt-modules-extra 5.14.0-70.121.1.rt21.193.el9_0, +2 more
    fixed: vendor fix RHSA-2024:9943
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-core 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-modules 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-debug-core 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-modules-core 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-debug-modules 5.14.0-284.92.1.rt14.377.el9_2, +4 more
    fixed: vendor fix RHSA-2024:9498
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.44.1.el9_4, kernel-rt-core 5.14.0-427.44.1.el9_4, kernel-rt-modules 5.14.0-427.44.1.el9_4, kernel-rt-debug-core 5.14.0-427.44.1.el9_4, kernel-rt-modules-core 5.14.0-427.44.1.el9_4, kernel-rt-debug-modules 5.14.0-427.44.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:9546
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-503.14.1.el9_5, kernel-rt-kvm 5.14.0-503.14.1.el9_5, kernel-rt-core 5.14.0-503.14.1.el9_5, kernel-rt-modules 5.14.0-503.14.1.el9_5, kernel-rt-debug-kvm 5.14.0-503.14.1.el9_5, kernel-rt-debug-core 5.14.0-503.14.1.el9_5, +6 more
    fixed: vendor fix RHSA-2024:9605
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-kvm 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-core 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-modules 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-debug-kvm 5.14.0-284.92.1.rt14.377.el9_2, kernel-rt-debug-core 5.14.0-284.92.1.rt14.377.el9_2, +6 more
    fixed: vendor fix RHSA-2024:9498
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt 5.14.0-427.44.1.el9_4, kernel-rt-kvm 5.14.0-427.44.1.el9_4, kernel-rt-core 5.14.0-427.44.1.el9_4, kernel-rt-modules 5.14.0-427.44.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.44.1.el9_4, kernel-rt-debug-core 5.14.0-427.44.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:9546
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-doc 5.14.0-284.92.1.el9_2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.