Vulnerability-Lookup

CVE-2026-98378 (GCVE-0-2026-98378)

Vulnerability from cvelistv5 – Published: 2026-10-09 07:34 – Updated: 2026-10-09 07:34

Title

bpf: Skip unsettled links in link iterator

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Skip unsettled links in link iterator bpf_link_prime() inserts a link into link_idr before anon_inode_getfile() succeeds and before bpf_link_settle() publishes the ID in link->id. bpf_link_by_id() treats such an ID-zero link as unsettled, but the link iterator takes a reference without this check. If anon_inode_getfile() then fails, the creator removes the ID and frees its still-private link directly. The iterator is left with a dangling reference and its next bpf_link_put() accesses freed memory. Treat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as bpf_link_by_id() does. BUG: KASAN: slab-use-after-free in bpf_link_put Write of size 8 by task exp/384 Call Trace: bpf_link_put kernel/bpf/syscall.c:3372 bpf_link_seq_next kernel/bpf/link_iter.c:33 bpf_seq_read kernel/bpf/bpf_iter.c:158 vfs_read fs/read_write.c:572 ksys_read fs/read_write.c:716 do_syscall_64 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:121 Kernel panic - not syncing: KASAN: panic_on_warn set ...

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 54/100 over 6633 records in the last 180 days details

References

6 references

URL	Tags
https://git.kernel.org/stable/c/68930f8d40ab4c10c…
https://git.kernel.org/stable/c/c251ed48bd9063cf7…
https://git.kernel.org/stable/c/798a61edbc436cacd…
https://git.kernel.org/stable/c/6e271f093d15d323f…
https://git.kernel.org/stable/c/87ce4b53b7436b50f…
https://git.kernel.org/stable/c/50e80e2bb5e2be851…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 9f88361273082825d9f0d13a543d49f9fa0d44a8 , < 68930f8d40ab4c10ca3b019f076136758fd100a8 (git) Affected: 9f88361273082825d9f0d13a543d49f9fa0d44a8 , < c251ed48bd9063cf7de6049421e78b6de989060f (git) Affected: 9f88361273082825d9f0d13a543d49f9fa0d44a8 , < 798a61edbc436cacdb659927d067368eeb1e30e2 (git) Affected: 9f88361273082825d9f0d13a543d49f9fa0d44a8 , < 6e271f093d15d323f42de26f66556af53fa8e19f (git) Affected: 9f88361273082825d9f0d13a543d49f9fa0d44a8 , < 87ce4b53b7436b50fc984f0a6afaf77f68ac5573 (git) Affected: 9f88361273082825d9f0d13a543d49f9fa0d44a8 , < 50e80e2bb5e2be8515205b9c496b9640ddefa434 (git)	guessed
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.55 , ≤ 6.18.* (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3-rc5 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "7.3-rc5",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
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                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
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                  "versionStartIncluding": "5.19",
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                {
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Skip unsettled links in link iterator\n\nbpf_link_prime() inserts a link into link_idr before anon_inode_getfile()\nsucceeds and before bpf_link_settle() publishes the ID in link-\u003eid.\nbpf_link_by_id() treats such an ID-zero link as unsettled, but the link\niterator takes a reference without this check.\n\nIf anon_inode_getfile() then fails, the creator removes the ID and frees\nits still-private link directly.  The iterator is left with a dangling\nreference and its next bpf_link_put() accesses freed memory.\n\nTreat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as\nbpf_link_by_id() does.\n\n  BUG: KASAN: slab-use-after-free in bpf_link_put\n  Write of size 8 by task exp/384\n  Call Trace:\n  bpf_link_put                    kernel/bpf/syscall.c:3372\n  bpf_link_seq_next               kernel/bpf/link_iter.c:33\n  bpf_seq_read                    kernel/bpf/bpf_iter.c:158\n  vfs_read                        fs/read_write.c:572\n  ksys_read                       fs/read_write.c:716\n  do_syscall_64                   arch/x86/entry/syscall_64.c:84\n  entry_SYSCALL_64_after_hwframe  arch/x86/entry/entry_64.S:121\n  Kernel panic - not syncing: KASAN: panic_on_warn set ..."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-09T07:34:18.626Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      },
      "references": [
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2"
        },
        {
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        {
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        {
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    "datePublished": "2026-10-09T07:34:18.626Z",
    "dateReserved": "2026-09-25T10:25:14.345Z",
    "dateUpdated": "2026-10-09T07:34:18.626Z",
    "state": "PUBLISHED"
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      "date": "2026-10-09",
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                "programFiles": [
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                    "versionType": "semver"
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                    "lessThanOrEqual": "7.2.*",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Skip unsettled links in link iterator\n\nbpf_link_prime() inserts a link into link_idr before anon_inode_getfile()\nsucceeds and before bpf_link_settle() publishes the ID in link-\u003eid.\nbpf_link_by_id() treats such an ID-zero link as unsettled, but the link\niterator takes a reference without this check.\n\nIf anon_inode_getfile() then fails, the creator removes the ID and frees\nits still-private link directly.  The iterator is left with a dangling\nreference and its next bpf_link_put() accesses freed memory.\n\nTreat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as\nbpf_link_by_id() does.\n\n  BUG: KASAN: slab-use-after-free in bpf_link_put\n  Write of size 8 by task exp/384\n  Call Trace:\n  bpf_link_put                    kernel/bpf/syscall.c:3372\n  bpf_link_seq_next               kernel/bpf/link_iter.c:33\n  bpf_seq_read                    kernel/bpf/bpf_iter.c:158\n  vfs_read                        fs/read_write.c:572\n  ksys_read                       fs/read_write.c:716\n  do_syscall_64                   arch/x86/entry/syscall_64.c:84\n  entry_SYSCALL_64_after_hwframe  arch/x86/entry/entry_64.S:121\n  Kernel panic - not syncing: KASAN: panic_on_warn set ..."
          }
        ],
        "id": "CVE-2026-98378",
        "lastModified": "2026-10-09T08:16:56.123",
        "metrics": {},
        "published": "2026-10-09T08:16:56.123",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}

FKIE_CVE-2026-98378

Vulnerability from fkie_nvd - Published: 2026-10-09 08:16 - Updated: 2026-10-09 08:16

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/68930f8d40ab4c10ca3b019f076136758fd100a8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6e271f093d15d323f42de26f66556af53fa8e19f
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/87ce4b53b7436b50fc984f0a6afaf77f68ac5573
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c251ed48bd9063cf7de6049421e78b6de989060f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/syscall.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
              "versionType": "git"
            },
            {
              "lessThan": "c251ed48bd9063cf7de6049421e78b6de989060f",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "798a61edbc436cacdb659927d067368eeb1e30e2",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
              "versionType": "git"
            },
            {
              "lessThan": "87ce4b53b7436b50fc984f0a6afaf77f68ac5573",
              "status": "affected",
              "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
              "versionType": "git"
            },
            {
              "lessThan": "50e80e2bb5e2be8515205b9c496b9640ddefa434",
              "status": "affected",
              "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
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          ],
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            },
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Skip unsettled links in link iterator\n\nbpf_link_prime() inserts a link into link_idr before anon_inode_getfile()\nsucceeds and before bpf_link_settle() publishes the ID in link-\u003eid.\nbpf_link_by_id() treats such an ID-zero link as unsettled, but the link\niterator takes a reference without this check.\n\nIf anon_inode_getfile() then fails, the creator removes the ID and frees\nits still-private link directly.  The iterator is left with a dangling\nreference and its next bpf_link_put() accesses freed memory.\n\nTreat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as\nbpf_link_by_id() does.\n\n  BUG: KASAN: slab-use-after-free in bpf_link_put\n  Write of size 8 by task exp/384\n  Call Trace:\n  bpf_link_put                    kernel/bpf/syscall.c:3372\n  bpf_link_seq_next               kernel/bpf/link_iter.c:33\n  bpf_seq_read                    kernel/bpf/bpf_iter.c:158\n  vfs_read                        fs/read_write.c:572\n  ksys_read                       fs/read_write.c:716\n  do_syscall_64                   arch/x86/entry/syscall_64.c:84\n  entry_SYSCALL_64_after_hwframe  arch/x86/entry/entry_64.S:121\n  Kernel panic - not syncing: KASAN: panic_on_warn set ..."
    }
  ],
  "id": "CVE-2026-98378",
  "lastModified": "2026-10-09T08:16:56.123",
  "metrics": {},
  "published": "2026-10-09T08:16:56.123",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/68930f8d40ab4c10ca3b019f076136758fd100a8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6e271f093d15d323f42de26f66556af53fa8e19f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/87ce4b53b7436b50fc984f0a6afaf77f68ac5573"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c251ed48bd9063cf7de6049421e78b6de989060f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-9M4G-3F3P-3783

Vulnerability from github – Published: 2026-10-09 09:31 – Updated: 2026-10-09 09:31

Details

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

bpf: Skip unsettled links in link iterator

bpf_link_prime() inserts a link into link_idr before anon_inode_getfile() succeeds and before bpf_link_settle() publishes the ID in link->id. bpf_link_by_id() treats such an ID-zero link as unsettled, but the link iterator takes a reference without this check.

If anon_inode_getfile() then fails, the creator removes the ID and frees its still-private link directly. The iterator is left with a dangling reference and its next bpf_link_put() accesses freed memory.

Treat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as bpf_link_by_id() does.

BUG: KASAN: slab-use-after-free in bpf_link_put Write of size 8 by task exp/384 Call Trace: bpf_link_put kernel/bpf/syscall.c:3372 bpf_link_seq_next kernel/bpf/link_iter.c:33 bpf_seq_read kernel/bpf/bpf_iter.c:158 vfs_read fs/read_write.c:572 ksys_read fs/read_write.c:716 do_syscall_64 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:121 Kernel panic - not syncing: KASAN: panic_on_warn set ...

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98378"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-09T08:16:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Skip unsettled links in link iterator\n\nbpf_link_prime() inserts a link into link_idr before anon_inode_getfile()\nsucceeds and before bpf_link_settle() publishes the ID in link-\u003eid.\nbpf_link_by_id() treats such an ID-zero link as unsettled, but the link\niterator takes a reference without this check.\n\nIf anon_inode_getfile() then fails, the creator removes the ID and frees\nits still-private link directly.  The iterator is left with a dangling\nreference and its next bpf_link_put() accesses freed memory.\n\nTreat ID-zero entries as transient in bpf_link_get_curr_or_next(), just as\nbpf_link_by_id() does.\n\n  BUG: KASAN: slab-use-after-free in bpf_link_put\n  Write of size 8 by task exp/384\n  Call Trace:\n  bpf_link_put                    kernel/bpf/syscall.c:3372\n  bpf_link_seq_next               kernel/bpf/link_iter.c:33\n  bpf_seq_read                    kernel/bpf/bpf_iter.c:158\n  vfs_read                        fs/read_write.c:572\n  ksys_read                       fs/read_write.c:716\n  do_syscall_64                   arch/x86/entry/syscall_64.c:84\n  entry_SYSCALL_64_after_hwframe  arch/x86/entry/entry_64.S:121\n  Kernel panic - not syncing: KASAN: panic_on_warn set ...",
  "id": "GHSA-9m4g-3f3p-3783",
  "modified": "2026-10-09T09:31:05Z",
  "published": "2026-10-09T09:31:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98378"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50e80e2bb5e2be8515205b9c496b9640ddefa434"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68930f8d40ab4c10ca3b019f076136758fd100a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e271f093d15d323f42de26f66556af53fa8e19f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/798a61edbc436cacdb659927d067368eeb1e30e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87ce4b53b7436b50fc984f0a6afaf77f68ac5573"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c251ed48bd9063cf7de6049421e78b6de989060f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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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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Action not permitted

CVE-2026-98378 (GCVE-0-2026-98378)

FKIE_CVE-2026-98378

GHSA-9M4G-3F3P-3783

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