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bpf: Fix potential UAF in bpf_netns_link_update_prog

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix potential UAF in bpf_netns_link_update_prog In bpf_netns_link_update_prog, the checks for old_prog and prog type are currently performed locklessly before acquiring netns_bpf_mutex. This creates a race condition that can lead to a UAF issue. If two threads concurrently execute BPF_LINK_UPDATE on the same netns link, the following execution path can trigger a UAF: CPU0 CPU1 bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) return -EPERM; bpf_netns_link_update_prog if (old_prog && old_prog != link->prog) ... old_prog = xchg(&link->prog, new_prog); bpf_prog_put(old_prog); if (new_prog->type != link->prog->type) <-- trigger UAF Fix this by moving the old_prog and prog->type checks inside the netns_bpf_mutex critical section. Meanwhile, use guard() to simplify lock management and avoid all the goto jumping.

Announced Source revision 1
Original source ↗

CVE-2026-90393

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-2026-90393

Linux

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

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

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": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "d462b5481d77ce7df8a5ff89a699386f00c9214d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "bdddf3e1493ee973619c154a57071ce67f78598b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "79a66fd997d4eecf17302d613194879eb32e0986",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "f4ce6803df4095777191d800bebc50219b615ca0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "277168cb9d153ce8e9c3f9275670e32ae61b41d6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "bda86e9f31b9a296b6e64a51c91dc776fc9f613e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7f045a49fee04b5662cbdeaf0838f9322ae8c63a",
        "lessThan": "5c5997836381010fc5907b36bc17d3b19407e933",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/bpf/net_namespace.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/net_namespace.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90393

Source reference: /cveMetadata/cveId

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No explicit severity was provided.

Event
#36718 · Revision 1
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