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TI-2025-15682 Aliases CVE-2025-21727GHSA-wvmf-xh97-gmfr

padata: fix UAF in padata_reorder

Priority LOW 35CWE-416Published · 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: 35 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: padata: fix UAF in padata_reorder A bug was found when run ltp test: BUG: KASAN: slab-use-after-free in padata_find_next+0x29/0x1a0 Read of size 4 at addr ffff88bbfe003524 by task kworker/u113:2/3039206 CPU: 0 PID: 3039206 Comm: kworker/u113:2 Kdump: loaded Not tainted 6.6.0+ Workqueue: pdecrypt_parallel padata_parallel_worker Call Trace: <TASK> dump_stack_lvl+0x32/0x50 print_address_description.constprop.0+0x6b/0x3d0 print_report+0xdd/0x2c0 kasan_report+0xa5/0xd0 padata_find_next+0x29/0x1a0 padata_reorder+0x131/0x220 padata_parallel_worker+0x3d/0xc0 process_one_work+0x2ec/0x5a0 If 'mdelay(10)' is added before calling 'padata_find_next' in the 'padata_reorder' function, this issue could be reproduced easily with ltp test (pcrypt_aead01). This can be explained as bellow: pcrypt_aead_encrypt ... padata_do_parallel refcount_inc(&pd->refcnt); // add refcnt ... padata_do_serial padata_reorder // pd while (1) { padata_find_next(pd, true); // using pd queue_work_on ... padata_serial_worker crypto_del_alg padata_put_pd_cnt // sub refcnt padata_free_shell padata_put_pd(ps->pd); // pd is freed // loop again, but pd is freed // call padata_find_next, UAF } In the padata_reorder function, when it loops in 'while', if the alg is deleted, the refcnt may be decreased to 0 before entering 'padata_find_next', which leads to UAF. As mentioned in [1], do_serial is supposed to be called with BHs disabled and always happen under RCU protection, to address this issue, add synchronize_rcu() in 'padata_free_shell' wait for all _do_serial calls to finish. [1] https://lore.kernel.org/all/[email protected]/ [2] https://lore.kernel.org/linux-kernel/jfjz5d7zwbytztackem7ibzalm5lnxldi2eofeiczqmqs2m7o6@fq426cwnjtkm/

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00222 12th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.235, 5.15.179, 6.1.129 +4Red Hat: 15 advisoriesRed Hat: 35 fixed, 1 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
LinuxLinux5.4 and later5.10.235, 5.15.179, 6.1.129, 6.6.76, 6.12.13, 6.13.2, 6.14Patch availableCNA
  • Linux VendorLinux Affected 5.4 and later Fixed in 5.10.235, 5.15.179, 6.1.129, 6.6.76, 6.12.13, 6.13.2, 6.14 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*5.4 to before 5.10.235; 5.11 to before 5.15.179; 5.16 to before 6.1.129; 6.2 to before 6.6.76; 6.7 to before 6.12.13; 6.13 to before 6.13.2VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.4 to before 5.10.235; 5.11 to before 5.15.179; 5.16 to before 6.1.129; 6.2 to before 6.6.76; 6.7 to before 6.12.13; 6.13 to before 6.13.2 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.235, 5.15.179, 6.1.129, 6.6.76, 6.12.13, 6.13.2, 6.14

Red Hat 15 advisories

  • RHSA-2025:20518 Released 2025-11-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.5.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.5.1.el9_7, kernel-64k-devel-5.14.0-611.5.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.5.1.el9_7, kernel-64k-5.14.0-611.5.1.el9_7, kernel-64k-core-5.14.0-611.5.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.5.1.el9_7, libperf-5.14.0-611.5.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.5.1.el9_7, kernel-rt-64k-5.14.0-611.5.1.el9_7, kernel-rt-64k-core-5.14.0-611.5.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.5.1.el9_7, kernel-rt-core-5.14.0-611.5.1.el9_7, kernel-rt-debug-5.14.0-611.5.1.el9_7 +9
  • RHSA-2025:20095 Released 2025-11-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.8.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.8.1.el10_1, kernel-64k-devel-6.12.0-124.8.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.8.1.el10_1, kernel-64k-6.12.0-124.8.1.el10_1, kernel-64k-core-6.12.0-124.8.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.8.1.el10_1, libperf-6.12.0-124.8.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.8.1.el10_1, kernel-rt-64k-6.12.0-124.8.1.el10_1, kernel-rt-64k-core-6.12.0-124.8.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.8.1.el10_1, kernel-rt-core-6.12.0-124.8.1.el10_1, kernel-rt-debug-6.12.0-124.8.1.el10_1 +9
  • RHSA-2025:15035 Released 2025-09-02 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.170.1.el8_4, kernel-4.18.0-305.170.1.el8_4, kernel-abi-stablelists-4.18.0-305.170.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.170.1.el8_4, kernel-4.18.0-305.170.1.el8_4, kernel-abi-stablelists-4.18.0-305.170.1.el8_4 +14
Show 12 more Red Hat advisories
  • RHSA-2025:14094 Released 2025-08-19 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-core-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-5.14.0-70.142.1.rt21.214.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-core-5.14.0-70.142.1.rt21.214.el9_0, kernel-rt-debug-5.14.0-70.142.1.rt21.214.el9_0 +7
  • RHSA-2025:14054 Released 2025-08-19 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.142.1.el9_0, kernel-debug-devel-matched-5.14.0-70.142.1.el9_0, kernel-devel-5.14.0-70.142.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.142.1.el9_0, kernel-5.14.0-70.142.1.el9_0, kernel-abi-stablelists-5.14.0-70.142.1.el9_0 +14
  • RHSA-2025:13781 Released 2025-08-13 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.130.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.130.1.el9_2, kernel-64k-devel-5.14.0-284.130.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.130.1.el9_2, kernel-5.14.0-284.130.1.el9_2, kernel-64k-5.14.0-284.130.1.el9_2 +29
  • RHSA-2025:13776 Released 2025-08-13 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.157.1.el8_6, kernel-4.18.0-372.157.1.el8_6, kernel-abi-stablelists-4.18.0-372.157.1.el8_6 +14
  • RHSA-2025:13633 Released 2025-08-11 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-core-5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-debug-5.14.0-284.130.1.rt14.415.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-core-5.14.0-284.130.1.rt14.415.el9_2, kernel-rt-debug-5.14.0-284.130.1.rt14.415.el9_2 +11
  • RHSA-2025:13589 Released 2025-08-11 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.69.1.el8_10, kernel-4.18.0-553.69.1.el8_10, kernel-abi-stablelists-4.18.0-553.69.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.69.1.el8_10
  • RHSA-2025:13590 Released 2025-08-11 · Red Hat rating Moderate
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.69.1.rt7.410.el8_10, kernel-rt-core-4.18.0-553.69.1.rt7.410.el8_10, kernel-rt-debug-4.18.0-553.69.1.rt7.410.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.69.1.rt7.410.el8_10, kernel-rt-core-4.18.0-553.69.1.rt7.410.el8_10, kernel-rt-debug-4.18.0-553.69.1.rt7.410.el8_10 +7
  • RHSA-2025:13135 Released 2025-08-06 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.81.1.el9_4, libperf-5.14.0-427.81.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.81.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.81.1.el9_4, kernel-64k-devel-5.14.0-427.81.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.81.1.el9_4, kernel-5.14.0-427.81.1.el9_4, kernel-64k-5.14.0-427.81.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.81.1.el9_4, kernel-rt-core-5.14.0-427.81.1.el9_4, kernel-rt-debug-5.14.0-427.81.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.81.1.el9_4, kernel-rt-core-5.14.0-427.81.1.el9_4, kernel-rt-debug-5.14.0-427.81.1.el9_4 +11
  • RHSA-2025:13061 Released 2025-08-05 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.104.1.el8_8, kernel-4.18.0-477.104.1.el8_8, kernel-abi-stablelists-4.18.0-477.104.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.104.1.el8_8, kernel-4.18.0-477.104.1.el8_8, kernel-abi-stablelists-4.18.0-477.104.1.el8_8 +14
  • RHSA-2025:12746 Released 2025-08-04 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.32.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.32.1.el9_6, kernel-64k-devel-5.14.0-570.32.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.32.1.el9_6, kernel-64k-5.14.0-570.32.1.el9_6, kernel-64k-core-5.14.0-570.32.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.32.1.el9_6, libperf-5.14.0-570.32.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.32.1.el9_6, kernel-rt-64k-5.14.0-570.32.1.el9_6, kernel-rt-64k-core-5.14.0-570.32.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.32.1.el9_6, kernel-rt-core-5.14.0-570.32.1.el9_6, kernel-rt-debug-5.14.0-570.32.1.el9_6 +11
  • RHSA-2025:12662 Released 2025-08-04 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.25.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.25.1.el10_0, kernel-64k-devel-6.12.0-55.25.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.25.1.el10_0, kernel-64k-6.12.0-55.25.1.el10_0, kernel-64k-core-6.12.0-55.25.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.25.1.el10_0, libperf-6.12.0-55.25.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.25.1.el10_0, kernel-rt-64k-6.12.0-55.25.1.el10_0, kernel-rt-64k-core-6.12.0-55.25.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.25.1.el10_0, kernel-rt-core-6.12.0-55.25.1.el10_0, kernel-rt-debug-6.12.0-55.25.1.el10_0 +11
  • RHSA-2020:4431 Released 2020-11-04 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.el8, kernel-4.18.0-240.el8, kernel-abi-whitelists-4.18.0-240.el8 +19

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 (v. 8)Fixed RHSA-2020:4431
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2025:13135
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:12662, RHSA-2025:20095
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:12746, RHSA-2025:20518
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:14054
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:13781
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:13135
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:12662, RHSA-2025:20095
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2020:4431, RHSA-2025:13589
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:12746, RHSA-2025:20518
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2025:15035
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2025:13776
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2025:13776
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2025:13061
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2025:14054
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2025:13781
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2025:13135
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2025:15035
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2025:13776
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2025:13061
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2025:13589
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:12662, RHSA-2025:20095
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:12746, RHSA-2025:20518
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2025:13590
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2025:14094
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2025:13590
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:12662, RHSA-2025:20095
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:12746, RHSA-2025:20518
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2025:14094
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2025:13633
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2025:13135
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:12662, RHSA-2025:20095
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:12746, RHSA-2025:20518
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2025:13633
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2025:13135
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-21727
  2. 2026-10-03 Alias added: GHSA-wvmf-xh97-gmfr

References

Patch 7

  • 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