mm/mempolicy: fix mpol_new leak in shared_policy_replace
Priority LOW 25CWE-401Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 5 fixed, 4 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-401.
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix mpol_new leak in shared_policy_replace If mpol_new is allocated but not used in restart loop, mpol_new will be freed via mpol_put before returning to the caller. But refcnt is not initialized yet, so mpol_put could not do the right things and might leak the unused mpol_new. This would happen if mempolicy was updated on the shared shmem file while the sp->lock has been dropped during the memory allocation. This issue could be triggered easily with the below code snippet if there are many processes doing the below work at the same time: shmid = shmget((key_t)5566, 1024 * PAGE_SIZE, 0666|IPC_CREAT); shm = shmat(shmid, 0, 0); loop many times { mbind(shm, 1024 * PAGE_SIZE, MPOL_LOCAL, mask, maxnode, 0); mbind(shm + 128 * PAGE_SIZE, 128 * PAGE_SIZE, MPOL_DEFAULT, mask, maxnode, 0); }
Why it matters now
EPSS 0.00312 24th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.9.311, 4.14.276, 4.19.238 +6Red Hat: 2 advisoriesRed Hat: 5 fixed, 4 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.8 and later | 4.9.311, 4.14.276, 4.19.238, 5.4.189, 5.10.111, 5.15.34, 5.16.20, 5.17.3, 5.18 | Patch available | CNA |
- Linux VendorLinux Affected 3.8 and later Fixed in 4.9.311, 4.14.276, 4.19.238, 5.4.189, 5.10.111, 5.15.34, 5.16.20, 5.17.3, 5.18 Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.8.1 to before 4.9.311; 4.10 to before 4.14.276; 4.15 to before 4.19.238; 4.20 to before 5.4.189; 5.5 to before 5.10.111; 5.11 to before 5.15.34; 5.16 to before 5.16.20; 5.17 to before 5.17.3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:-:*:*:*:*:*:* | 3.8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc2:*:*:*:*:*:* | 3.8 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc3:*:*:*:*:*:* | 3.8 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc4:*:*:*:*:*:* | 3.8 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc5:*:*:*:*:*:* | 3.8 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc6:*:*:*:*:*:* | 3.8 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:3.8:rc7:*:*:*:*:*:* | 3.8 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* | 5.18 rc1 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.8.1 to before 4.9.311; 4.10 to before 4.14.276; 4.15 to before 4.19.238; 4.20 to before 5.4.189; 5.5 to before 5.10.111; 5.11 to before 5.15.34; 5.16 to before 5.16.20; 5.17 to before 5.17.3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:-:*:*:*:*:*:* Versions 3.8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc2:*:*:*:*:*:* Versions 3.8 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc3:*:*:*:*:*:* Versions 3.8 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc4:*:*:*:*:*:* Versions 3.8 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc5:*:*:*:*:*:* Versions 3.8 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc6:*:*:*:*:*:* Versions 3.8 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:3.8:rc7:*:*:*:*:*:* Versions 3.8 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* Versions 5.18 rc1 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.9.311, 4.14.276, 4.19.238, 5.4.189, 5.10.111, 5.15.34, 5.16.20, 5.17.3, 5.18
Red Hat 2 advisories
- RHSA-2023:7077 Released 2023-11-14 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-513.5.1.el8_9
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-513.5.1.el8_9, kernel-4.18.0-513.5.1.el8_9, kernel-abi-stablelists-4.18.0-513.5.1.el8_9 +19
- RHSA-2023:2458 Released 2023-05-09 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-284.11.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.11.1.el9_2, kernel-64k-devel-5.14.0-284.11.1.el9_2 +10
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.0.0-284.11.1.el9_2, kernel-5.14.0-284.11.1.el9_2, kernel-64k-5.14.0-284.11.1.el9_2 +29
- Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-284.11.1.el9_2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2023:7077 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:2458 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2023:7077 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2023:2458 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2023:2458 |
Not affected: 1 product
- Red Hat Enterprise Linux 10
Timeline
- 2026-10-02 Threatist record created from CVE-2022-49080
- 2026-10-03 Alias added: GHSA-rx6x-4frg-6jxm
References
Patch 9
- https://git.kernel.org/stable/c/8510c2346d9e47a72b7f018a36ef0c39483e53d6
- https://git.kernel.org/stable/c/5e16dc5378abd749a836daa9ee4ab2c8d2668999
- https://git.kernel.org/stable/c/39a32f3c06f6d68a530bf9612afa19f50f12e93d
- https://git.kernel.org/stable/c/25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b
- https://git.kernel.org/stable/c/f7e183b0a7136b6dc9c7b9b2a85a608a8feba894
- https://git.kernel.org/stable/c/198932a14aeb19a15cf19e51e151d023bc4cd648
- https://git.kernel.org/stable/c/6e00309ac716fa8225f0cbde2cd9c24f0e74ee21
- https://git.kernel.org/stable/c/fe39ac59dbbf893b73b24e3184161d0bd06d6651
- https://git.kernel.org/stable/c/4ad099559b00ac01c3726e5c95dc3108ef47d03e
More Linux Kernel vulnerabilities
- 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
Sources
- CVE-2022-49080 · CVE Program
- CVE-2022-49080 · NVD
- FIRST EPSS
- GHSA-rx6x-4frg-6jxm · GitHub Advisory Database · CC BY 4.0
- CVE-2022-49080 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences