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GHSA-792P-R5W2-5GFR

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-19 18:32

Details

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

mips: sched: Fix CPUMASK_OFFSTACK memory corruption

This patch addresses a critical memory management flaw. When CONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer. Consequently, sizeof(new_mask) evaluates to the pointer size, causing copy_from_user() to clobber the mask pointer. Furthermore, the old logic performed copy_from_user() before allocating the mask.

Fix this by allocating new_mask first. To handle variable-sized user masks correctly, use cpumask_size() to truncate overly large user masks or pad undersized masks with zeros before copying the data directly into the allocated buffer.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72181"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:36Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmips: sched: Fix CPUMASK_OFFSTACK memory corruption\n\nThis patch addresses a critical memory management flaw. When\nCONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer.\nConsequently, sizeof(new_mask) evaluates to the pointer size, causing\ncopy_from_user() to clobber the mask pointer. Furthermore, the old\nlogic performed copy_from_user() before allocating the mask.\n\nFix this by allocating new_mask first. To handle variable-sized user\nmasks correctly, use cpumask_size() to truncate overly large user masks\nor pad undersized masks with zeros before copying the data directly into\nthe allocated buffer.",
  "id": "GHSA-792p-r5w2-5gfr",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T06:32:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72181"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/15ba8053fe4162c933855f1676fb321cdb6251c7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1caee6e084a96ada94658f261ced377d85af3f03"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f7730c03a9deea3ba7a1c980070d363b4ea2046"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3446ffb5d03c36f9ce88ede7ca5be319a2968d96"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87a56c1e8e36d06ebe8640432f911538ded7827d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98e37db4a34d3af3fb2f4648295c25b5e40b20e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d20ee42f8226607b5693b2bc2f115ca2d270221a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-72181 (GCVE-0-2026-72181)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-19 16:36

Title

mips: sched: Fix CPUMASK_OFFSTACK memory corruption

Summary

In the Linux kernel, the following vulnerability has been resolved: mips: sched: Fix CPUMASK_OFFSTACK memory corruption This patch addresses a critical memory management flaw. When CONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer. Consequently, sizeof(new_mask) evaluates to the pointer size, causing copy_from_user() to clobber the mask pointer. Furthermore, the old logic performed copy_from_user() before allocating the mask. Fix this by allocating new_mask first. To handle variable-sized user masks correctly, use cpumask_size() to truncate overly large user masks or pad undersized masks with zeros before copying the data directly into the allocated buffer.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/2f7730c03a9deea3b…
https://git.kernel.org/stable/c/d20ee42f8226607b5…
https://git.kernel.org/stable/c/15ba8053fe4162c93…
https://git.kernel.org/stable/c/3446ffb5d03c36f9c…
https://git.kernel.org/stable/c/87a56c1e8e36d06eb…
https://git.kernel.org/stable/c/1caee6e084a96ada9…
https://git.kernel.org/stable/c/a1dd41d00c57efb1f…
https://git.kernel.org/stable/c/98e37db4a34d3af3f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < 2f7730c03a9deea3ba7a1c980070d363b4ea2046 (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < d20ee42f8226607b5693b2bc2f115ca2d270221a (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < 15ba8053fe4162c933855f1676fb321cdb6251c7 (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < 3446ffb5d03c36f9ce88ede7ca5be319a2968d96 (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < 87a56c1e8e36d06ebe8640432f911538ded7827d (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < 1caee6e084a96ada94658f261ced377d85af3f03 (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < a1dd41d00c57efb1fbc6f361c5f48c9d00cca51c (git) Affected: 295cbf6d63165fe4253cf1d9ceadcda47a318b48 , < 98e37db4a34d3af3fb2f4648295c25b5e40b20e3 (git)
Linux	Linux	Affected: 2.6.23 Unaffected: 0 , < 2.6.23 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/mips/kernel/mips-mt-fpaff.c"
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            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
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              "status": "unaffected",
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                {
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                  "versionStartIncluding": "2.6.23",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmips: sched: Fix CPUMASK_OFFSTACK memory corruption\n\nThis patch addresses a critical memory management flaw. When\nCONFIG_CPUMASK_OFFSTACK is enabled, cpumask_var_t is a pointer.\nConsequently, sizeof(new_mask) evaluates to the pointer size, causing\ncopy_from_user() to clobber the mask pointer. Furthermore, the old\nlogic performed copy_from_user() before allocating the mask.\n\nFix this by allocating new_mask first. To handle variable-sized user\nmasks correctly, use cpumask_size() to truncate overly large user masks\nor pad undersized masks with zeros before copying the data directly into\nthe allocated buffer."
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            "baseSeverity": "HIGH",
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              "value": "AV:L - Exploitation requires invoking the sched_setaffinity syscall on a MIPS o32 kernel; the vulnerable mipsmt_sys_sched_setaffinity handler is only wired into the o32 syscall table and is not reachable from remote network protocols.\nAC:L - On affected builds the attacker reliably triggers the flaw with a single sched_setaffinity syscall supplying a user buffer; no races, special victim state, or uncontrollable memory layout are required beyond calling the syscall with attacker-chosen mask bytes.\nPR:L - Any unprivileged local user can call sched_setaffinity; the corrupting copy_from_user runs before check_same_owner/CAP_SYS_NICE, and setting affinity on one\u0027s own process needs no special capabilities beyond normal local execution.\nUI:N - Exploitation requires only a direct sched_setaffinity syscall from the attacker; no victim interaction such as opening files, clicking links, or mounting filesystems is needed.\nS:U - The vulnerability corrupts kernel stack/scheduler state within the same kernel security domain; it does not cross a VM, container, or IOMMU boundary on its own.\nC:H - Misplaced copy_from_user clobbers a kernel stack pointer with attacker-controlled bytes, and the never-initialized kmalloc cpumask can be stored in user_cpus_allowed and leaked back to userspace via sched_getaffinity.\nI:H - The bug is a kernel memory corruption from writing attacker-controlled data to the wrong address (the cpumask pointer on the stack) before allocation, which is an out-of-bounds-style write primitive in kernel context.\nA:H - Kernel memory corruption in the sched_setaffinity path can cause oops, panic, or wedged scheduling/affinity state; corrupted stack data and misuse of uninitialized cpumask contents can crash or hang the system."
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        "dateUpdated": "2026-08-19T16:36:28.810Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/98e37db4a34d3af3fb2f4648295c25b5e40b20e3"
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      "title": "mips: sched: Fix CPUMASK_OFFSTACK memory corruption",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72181",
    "datePublished": "2026-08-15T05:53:44.453Z",
    "dateReserved": "2026-08-09T03:40:39.910Z",
    "dateUpdated": "2026-08-19T16:36:28.810Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-792P-R5W2-5GFR

CVE-2026-72181 (GCVE-0-2026-72181)

Tags

Sightings

Nomenclature