cve-2026-31418
MEDIUM CVSS 5.5 nvd
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.
Timeline
- Published
- 2026-04-13
- Last Modified
- 2026-11-05
CVSS Details
- Attack Vector
- LOCAL
- Attack Complexity
- LOW
- Privileges Required
- LOW
Affected Products
- linux linux_kernel
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 5.5 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8 | 3.6 | nvd@nist.gov |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.4.24, < 5.5 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.5.8, < 5.6 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.6.1, < 5.10.253 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.11, < 5.15.203 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.16, < 6.1.168 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.2, < 6.6.134 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.7, < 6.12.81 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.13, < 6.18.22 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.19, < 6.19.12 | yes |
cpe:2.3:o:linux:linux_kernel:5.6:-:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:5.6:rc4:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:5.6:rc5:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:5.6:rc6:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:5.6:rc7:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* |
— | yes |
NVD metadata
- NVD status
- Modified
- Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/58f3a14826d4e6b0d5421f1a64be280b48601ea2 Patch
- https://git.kernel.org/stable/c/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4 Patch
- https://git.kernel.org/stable/c/6cea34d7ec6829b62f521a37a287f670144a2233 Patch
- https://git.kernel.org/stable/c/9862ef9ab0a116c6dca98842aab7de13a252ae02 Patch
- https://git.kernel.org/stable/c/ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb Patch
- https://git.kernel.org/stable/c/b7eef00f08b92b0b9efe8ae0df6d0005e6199323 Patch
- https://git.kernel.org/stable/c/c098ff857e7ca923539164af5b3c2fe3e8f8afaf Patch
- https://git.kernel.org/stable/c/ceacaa76f221a6577aba945bb8873c2e640aeba4 Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
Linked Vulnerabilities
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"dateUpdated": "2026-11-05T22:18:29.717",
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"id": "CVE-2026-31418",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: drop logically empty buckets in mtype_del\n\nmtype_del() counts empty slots below n->pos in k, but it only drops the\nbucket when both n->pos and k are zero. This misses buckets whose live\nentries have all been removed while n->pos still points past deleted slots.\n\nTreat a bucket as empty when all positions below n->pos are unused and\nrelease it directly instead of shrinking it further."
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"baseScore": 5.5,
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"confidentialityImpact": "NONE",
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"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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}