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TI-2025-15949 Aliases CVE-2025-21999GHSA-vmv5-h8c6-426p

proc: fix UAF in proc_get_inode()

Priority LOW 36CWE-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: 19 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: proc: fix UAF in proc_get_inode() Fix race between rmmod and /proc/XXX's inode instantiation. The bug is that pde->proc_ops don't belong to /proc, it belongs to a module, therefore dereferencing it after /proc entry has been registered is a bug unless use_pde/unuse_pde() pair has been used. use_pde/unuse_pde can be avoided (2 atomic ops!) because pde->proc_ops never changes so information necessary for inode instantiation can be saved _before_ proc_register() in PDE itself and used later, avoiding pde->proc_ops->... dereference. rmmod lookup sys_delete_module proc_lookup_de pde_get(de); proc_get_inode(dir->i_sb, de); mod->exit() proc_remove remove_proc_subtree proc_entry_rundown(de); free_module(mod); if (S_ISREG(inode->i_mode)) if (de->proc_ops->proc_read_iter) --> As module is already freed, will trigger UAF BUG: unable to handle page fault for address: fffffbfff80a702b PGD 817fc4067 P4D 817fc4067 PUD 817fc0067 PMD 102ef4067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 26 UID: 0 PID: 2667 Comm: ls Tainted: G Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:proc_get_inode+0x302/0x6e0 RSP: 0018:ffff88811c837998 EFLAGS: 00010a06 RAX: dffffc0000000000 RBX: ffffffffc0538140 RCX: 0000000000000007 RDX: 1ffffffff80a702b RSI: 0000000000000001 RDI: ffffffffc0538158 RBP: ffff8881299a6000 R08: 0000000067bbe1e5 R09: 1ffff11023906f20 R10: ffffffffb560ca07 R11: ffffffffb2b43a58 R12: ffff888105bb78f0 R13: ffff888100518048 R14: ffff8881299a6004 R15: 0000000000000001 FS: 00007f95b9686840(0000) GS:ffff8883af100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff80a702b CR3: 0000000117dd2000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> proc_lookup_de+0x11f/0x2e0 __lookup_slow+0x188/0x350 walk_component+0x2ab/0x4f0 path_lookupat+0x120/0x660 filename_lookup+0x1ce/0x560 vfs_statx+0xac/0x150 __do_sys_newstat+0x96/0x110 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e [[email protected]: don't do 2 atomic ops on the common path]

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00233 14th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.236, 5.15.180, 6.1.132 +4Red Hat: 5 advisoriesRed Hat: 19 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
LinuxLinux5.6 and later5.10.236, 5.15.180, 6.1.132, 6.6.85, 6.12.21, 6.13.9, 6.14Patch availableCNA
  • Linux VendorLinux Affected 5.6 and later Fixed in 5.10.236, 5.15.180, 6.1.132, 6.6.85, 6.12.21, 6.13.9, 6.14 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.23 to before 6.1.132; 6.2 to before 6.6.85; 6.7 to before 6.12.21; 6.13 to before 6.13.9VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*6.14 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*6.14 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*6.14 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*6.14 rc4VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.23 to before 6.1.132; 6.2 to before 6.6.85; 6.7 to before 6.12.21; 6.13 to before 6.13.9 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* Versions 6.14 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* Versions 6.14 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:* Versions 6.14 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:* Versions 6.14 rc4 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.236, 5.15.180, 6.1.132, 6.6.85, 6.12.21, 6.13.9, 6.14

Red Hat 5 advisories

  • 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
Show 2 more Red Hat advisories
  • RHSA-2025:9348 Released 2025-06-23 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-55.18.1.el10_0, kernel-64k-debug-devel-matched-6.12.0-55.18.1.el10_0, kernel-64k-devel-6.12.0-55.18.1.el10_0 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-55.18.1.el10_0, kernel-64k-6.12.0-55.18.1.el10_0, kernel-64k-core-6.12.0-55.18.1.el10_0 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-55.18.1.el10_0, libperf-6.12.0-55.18.1.el10_0
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-55.18.1.el10_0, kernel-rt-64k-6.12.0-55.18.1.el10_0, kernel-rt-64k-core-6.12.0-55.18.1.el10_0 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-55.18.1.el10_0, kernel-rt-core-6.12.0-55.18.1.el10_0, kernel-rt-debug-6.12.0-55.18.1.el10_0 +11
  • RHSA-2025:9080 Released 2025-06-16 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.22.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.22.1.el9_6, kernel-64k-devel-5.14.0-570.22.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-570.22.1.el9_6, kernel-64k-5.14.0-570.22.1.el9_6, kernel-64k-core-5.14.0-570.22.1.el9_6 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-570.22.1.el9_6, libperf-5.14.0-570.22.1.el9_6
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-570.22.1.el9_6, kernel-rt-64k-5.14.0-570.22.1.el9_6, kernel-rt-64k-core-5.14.0-570.22.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-570.22.1.el9_6, kernel-rt-core-5.14.0-570.22.1.el9_6, kernel-rt-debug-5.14.0-570.22.1.el9_6 +11

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.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2025:9348
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:9080
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:20593
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2025:9348
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2025:9080
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:20593
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2025:9348
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2025:9080
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2025:9348
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2025:9080
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:19875
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:21209
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2025:9348
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2025:9080
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.9.4)Fixed RHSA-2026:21209
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-21999
  2. 2026-10-03 Alias added: GHSA-vmv5-h8c6-426p

References

Patch 5

Other 2

  • 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