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Fencer Vulns
high 7.8

CVE-2022-50673 json

ext4: fix use-after-free in ext4_orphan_cleanup

published 2025-12-09 11 mo ago modified 2026-08-05 3 mo ago also EUVD-2022-55732

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits
0
none known

Summary

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

ext4: fix use-after-free in ext4_orphan_cleanup

I caught a issue as follows: ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0 Read of size 8 at addr ffff88814b13f378 by task mount/710

CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370 Call Trace: <TASK> dump_stack_lvl+0x73/0x9f print_report+0x25d/0x759 kasan_report+0xc0/0x120 __asan_load8+0x99/0x140 __list_add_valid+0x28/0x1a0 ext4_orphan_cleanup+0x564/0x9d0 [ext4] __ext4_fill_super+0x48e2/0x5300 [ext4] ext4_fill_super+0x19f/0x3a0 [ext4] get_tree_bdev+0x27b/0x450 ext4_get_tree+0x19/0x30 [ext4] vfs_get_tree+0x49/0x150 path_mount+0xaae/0x1350 do_mount+0xe2/0x110 __x64_sys_mount+0xf0/0x190 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> [...] ==================================================================

Above issue may happen as follows: ------------------------------------- ext4_fill_super ext4_orphan_cleanup --- loop1: assume last_orphan is 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan) ext4_truncate --> return 0 ext4_inode_attach_jinode --> return -ENOMEM iput(inode) --> free inode<12> --- loop2: last_orphan is still 12 --- list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); // use inode<12> and trigger UAF

To solve this issue, we need to propagate the return value of ext4_inode_attach_jinode() appropriately.

Patch / fix

  • Linux Linux 4.19.270, 5.4.229, 5.10.163, 5.15.87, 6.0.18, 6.1.4, 6.2
  • linux Debian 14, Debian 13, Debian 12 6.1.4-1

debian advisories DEBIAN-CVE-2022-50673

  • linux Ubuntu 20.04 LTS 5.4.0-144.161
  • linux Ubuntu 22.04 LTS 5.15.0-69.76
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1097.105
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1033.37
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1101.110
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1031.38
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1030.35
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1045.50

ubuntu advisories UBUNTU-CVE-2022-50673

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

  • kernel-rt RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.104.1.rt7.445.el8_10

red hat advisories RHSA-2026:3685RHSA-2026:3634RHSA-2026:3360RHSA-2026:3358RHSA-2026:3277RHSA-2026:3267

  • kernel-64kb SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS, SLE High Performance Computing 15 SP4-ESPOS 5.14.21-150400.24.194.1
  • kernel-syms SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.194.1
  • kernel-source SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.194.1
  • kernel-default SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +5 more 5.14.21-150400.24.194.1
  • kernel-obs-build SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 5.14.21-150400.24.194.1
  • kernel-default-base SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 5.14.21-150400.24.194.1.150400.24.98.3
  • kernel-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.142.1
  • kernel-source-rt SLE Micro 5.4, SLE Micro 5.3 5.14.21-150400.15.142.1

suse advisories SUSE-SU-2026:0617-1SUSE-SU-2026:0411-1SUSE-SU-2026:0317-1SUSE-SU-2026:0263-1

  • kernel-rt AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.104.1.rt7.445.el8_10
  • kernel AlmaLinux 8 4.18.0-553.104.1.el8_10

almalinux advisories ALSA-2026:2378ALSA-2026:2264

  • kernel Rocky Linux 8 4.18.0-553.104.1.el8_10

rocky linux advisories RLSA-2026:2264

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-2022-50673 updated cvss 6.7

kernel: ext4: fix use-after-free in ext4_orphan_cleanup

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • 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 Enterprise Linux AppStream (v. 9) rv 5.14.0-427.13.1.el9_4, perf 5.14.0-427.13.1.el9_4, rtla 5.14.0-427.13.1.el9_4, kernel-devel-matched 5.14.0-427.13.1.el9_4, kernel-64k-devel-matched 5.14.0-427.13.1.el9_4, kernel-debug-devel-matched 5.14.0-427.13.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.165.1.el9_0, kernel-devel-matched 5.14.0-70.165.1.el9_0, kernel-debug-devel-matched 5.14.0-70.165.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.165.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.165.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.165.1.el9_0, +2 more
    fixed: vendor fix RHSA-2026:2573
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.158.1.el9_2, rtla 5.14.0-284.158.1.el9_2, kernel-devel-matched 5.14.0-284.158.1.el9_2, kernel-64k-devel-matched 5.14.0-284.158.1.el9_2, kernel-debug-devel-matched 5.14.0-284.158.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.158.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:3267
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.104.1.el8_10, kernel 4.18.0-553.104.1.el8_10, bpftool 4.18.0-553.104.1.el8_10, kernel-core 4.18.0-553.104.1.el8_10, kernel-tools 4.18.0-553.104.1.el8_10, python3-perf 4.18.0-553.104.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:2264
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.3.0-427.13.1.el9_4, kernel 5.14.0-427.13.1.el9_4, kernel-64k 5.14.0-427.13.1.el9_4, kernel-core 5.14.0-427.13.1.el9_4, kernel-tools 5.14.0-427.13.1.el9_4, python3-perf 5.14.0-427.13.1.el9_4, +28 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) perf 4.18.0-193.185.1.el8_2, kernel 4.18.0-193.185.1.el8_2, bpftool 4.18.0-193.185.1.el8_2, kernel-core 4.18.0-193.185.1.el8_2, kernel-tools 4.18.0-193.185.1.el8_2, python3-perf 4.18.0-193.185.1.el8_2, +8 more
    fixed: vendor fix RHSA-2026:2664
show 19 more
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.186.1.el8_4, kernel 4.18.0-305.186.1.el8_4, bpftool 4.18.0-305.186.1.el8_4, kernel-core 4.18.0-305.186.1.el8_4, kernel-tools 4.18.0-305.186.1.el8_4, python3-perf 4.18.0-305.186.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:3360
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.179.1.el8_6, kernel 4.18.0-372.179.1.el8_6, bpftool 4.18.0-372.179.1.el8_6, kernel-core 4.18.0-372.179.1.el8_6, kernel-tools 4.18.0-372.179.1.el8_6, python3-perf 4.18.0-372.179.1.el8_6, +8 more Red Hat Enterprise Linux BaseOS E4S (v.8.6) perf 4.18.0-372.179.1.el8_6, kernel 4.18.0-372.179.1.el8_6, bpftool 4.18.0-372.179.1.el8_6, kernel-core 4.18.0-372.179.1.el8_6, kernel-tools 4.18.0-372.179.1.el8_6, python3-perf 4.18.0-372.179.1.el8_6, +15 more
    fixed: vendor fix RHSA-2026:2490
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.130.1.el8_8, kernel 4.18.0-477.130.1.el8_8, bpftool 4.18.0-477.130.1.el8_8, kernel-core 4.18.0-477.130.1.el8_8, kernel-tools 4.18.0-477.130.1.el8_8, python3-perf 4.18.0-477.130.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:3277
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.165.1.el9_0, bpftool 5.14.0-70.165.1.el9_0, kernel-core 5.14.0-70.165.1.el9_0, kernel-tools 5.14.0-70.165.1.el9_0, python3-perf 5.14.0-70.165.1.el9_0, kernel-modules 5.14.0-70.165.1.el9_0, +14 more
    fixed: vendor fix RHSA-2026:2573
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.158.1.el9_2, kernel 5.14.0-284.158.1.el9_2, kernel-64k 5.14.0-284.158.1.el9_2, kernel-core 5.14.0-284.158.1.el9_2, kernel-tools 5.14.0-284.158.1.el9_2, python3-perf 5.14.0-284.158.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:3267
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.186.1.el8_4, kernel 4.18.0-305.186.1.el8_4, bpftool 4.18.0-305.186.1.el8_4, kernel-core 4.18.0-305.186.1.el8_4, kernel-tools 4.18.0-305.186.1.el8_4, python3-perf 4.18.0-305.186.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:3360
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) perf 4.18.0-372.179.1.el8_6, kernel 4.18.0-372.179.1.el8_6, bpftool 4.18.0-372.179.1.el8_6, kernel-core 4.18.0-372.179.1.el8_6, kernel-tools 4.18.0-372.179.1.el8_6, python3-perf 4.18.0-372.179.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:2490
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.130.1.el8_8, kernel 4.18.0-477.130.1.el8_8, bpftool 4.18.0-477.130.1.el8_8, kernel-core 4.18.0-477.130.1.el8_8, kernel-tools 4.18.0-477.130.1.el8_8, python3-perf 4.18.0-477.130.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:3277
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.104.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.104.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.104.1.el8_10
    fixed: vendor fix RHSA-2026:2264
  • Red Hat Enterprise Linux CRB (v. 9) libperf 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.13.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.13.1.el9_4
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.147.1.rt56.1299.el7, kernel-rt-trace 3.10.0-1160.147.1.rt56.1299.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.147.1.rt56.1299.el7
    fixed: vendor fix RHSA-2026:3634
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-kvm 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-core 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-modules 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-kvm 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-core 4.18.0-553.104.1.rt7.445.el8_10, +4 more
    fixed: vendor fix RHSA-2026:2378
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-kvm 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, +6 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-kvm 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-core 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-modules 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-debug-kvm 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-debug-core 5.14.0-70.165.1.rt21.237.el9_0, +4 more Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-core 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-modules 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-debug-core 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-debug-modules 5.14.0-70.165.1.rt21.237.el9_0, kernel-rt-modules-extra 5.14.0-70.165.1.rt21.237.el9_0, +2 more
    fixed: vendor fix RHSA-2026:2577
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-modules 5.14.0-284.158.1.rt14.443.el9_2, +4 more Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-kvm 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-core 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-modules 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-kvm 5.14.0-284.158.1.rt14.443.el9_2, kernel-rt-debug-core 5.14.0-284.158.1.rt14.443.el9_2, +6 more
    fixed: vendor fix RHSA-2026:3358
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-core 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-modules 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-core 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-debug-modules 4.18.0-553.104.1.rt7.445.el8_10, kernel-rt-modules-extra 4.18.0-553.104.1.rt7.445.el8_10, +2 more
    fixed: vendor fix RHSA-2026:2378
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-427.13.1.el9_4, kernel-rt-core 5.14.0-427.13.1.el9_4, kernel-rt-modules 5.14.0-427.13.1.el9_4, kernel-rt-debug-core 5.14.0-427.13.1.el9_4, kernel-rt-modules-core 5.14.0-427.13.1.el9_4, kernel-rt-debug-modules 5.14.0-427.13.1.el9_4, +4 more
    fixed: vendor fix RHSA-2024:2394
  • Red Hat Enterprise Linux Server (v. 7 ELS) perf 3.10.0-1160.147.1.el7, kernel 3.10.0-1160.147.1.el7, bpftool 3.10.0-1160.147.1.el7, python-perf 3.10.0-1160.147.1.el7, kernel-kdump 3.10.0-1160.147.1.el7, kernel-tools 3.10.0-1160.147.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debuginfo-common-ppc64 3.10.0-1160.147.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.147.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.147.1.el7
    fixed: vendor fix RHSA-2026:3685
  • Red Hat Enterprise Linux 10 kernel
    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
4 mo ago

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

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.