🛡️ CVE-2024-57877 — kernel

🟡 CVSS 6.1 — Medium ✅ No Known Exploit NVD
6.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

arm64: ptrace: fix partial SETREGSET for NT_ARM_POE

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

arm64: ptrace: fix partial SETREGSET for NT_ARM_POE

Currently poe_set() doesn't initialize the temporary 'ctrl' variable,

and a SETREGSET call with a length of zero will leave this

uninitialized. Consequently an arbitrary value will be written back to

target->thread.por_el0, potentially leaking up to 64 bits of memory from

the kernel stack. The read is limited to a specific slot on the stack,

and the issue does not provide a write mechanism.

Fix this by initializing the temporary value before copying the regset

from userspace, as for other regsets (e.g. NT_PRSTATUS, NT_PRFPREG,

NT_ARM_SYSTEM_CALL). In the case of a zero-length write, the existing

contents of POR_EL1 will be retained.

Before this patch:

| # ./poe-test

| Attempting to write NT_ARM_POE::por_el0 = 0x900d900d900d900d

| SETREGSET(nt=0x40f, len=8) wrote 8 bytes

|

| Attempting to read NT_ARM_POE::por_el0

| GETREGSET(nt=0x40f, len=8) read 8 bytes

| Read NT_ARM_POE::por_el0 = 0x900d900d900d900d

|

| Attempting to write NT_ARM_POE (zero length)

| SETREGSET(nt=0x40f, len=0) wrote 0 bytes

|

| Attempting to read NT_ARM_POE::por_el0

| GETREGSET(nt=0x40f, len=8) read 8 bytes

| Read NT_ARM_POE::por_el0 = 0xffff8000839c3d50

After this patch:

| # ./poe-test

| Attempting to write NT_ARM_POE::por_el0 = 0x900d900d900d900d

| SETREGSET(nt=0x40f, len=8) wrote 8 bytes

|

| Attempting to read NT_ARM_POE::por_el0

| GETREGSET(nt=0x40f, len=8) read 8 bytes

| Read NT_ARM_POE::por_el0 = 0x900d900d900d900d

|

| Attempting to write NT_ARM_POE (zero length)

| SETREGSET(nt=0x40f, len=0) wrote 0 bytes

|

| Attempting to read NT_ARM_POE::por_el0

| GETREGSET(nt=0x40f, len=8) read 8 bytes

| Read NT_ARM_POE::por_el0 = 0x900d900d900d900d

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability high.

Affected software

CVE-2024-57877 is recorded against 2 packages.

  • kernel (from 6.12.0 up to 6.12.5)
  • linux-kernel

Timeline and source

Published on 11 January 2025 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2024-57877 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 6.1
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-01-11
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 6.12.0 6.12.5
linux-kernel — —

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