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bpf: Skip unsettled links in link iterator

Type: advisorySource: Official CVE List1 source record

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 ...

Announced Source revision 1
Original source ↗

CVE-2026-98378

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98378

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
        "lessThan": "68930f8d40ab4c10ca3b019f076136758fd100a8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
        "lessThan": "c251ed48bd9063cf7de6049421e78b6de989060f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
        "lessThan": "798a61edbc436cacdb659927d067368eeb1e30e2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
        "lessThan": "6e271f093d15d323f42de26f66556af53fa8e19f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
        "lessThan": "87ce4b53b7436b50fc984f0a6afaf77f68ac5573",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9f88361273082825d9f0d13a543d49f9fa0d44a8",
        "lessThan": "50e80e2bb5e2be8515205b9c496b9640ddefa434",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/bpf/syscall.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/syscall.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98378

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#55584 · Revision 1
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Publisher date
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