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bpf: Disable preemption in bpf_event_output

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Disable preemption in bpf_event_output We received report [1] of kernel crash, which is caused by using nesting protection without disabled preemption. The bpf_event_output can be called by programs executed by bpf_prog_run_array_cg function that disabled migration but keeps preemption enabled. This can cause task to be preempted by another one inside the nesting protection and lead eventually to two tasks using same perf_sample_data buffer and cause crashes like: BUG: kernel NULL pointer dereference, address: 0000000000000001 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page ... ? perf_output_sample+0x12a/0x9a0 ? finish_task_switch.isra.0+0x81/0x280 ? perf_event_output+0x66/0xa0 ? bpf_event_output+0x13a/0x190 ? bpf_event_output_data+0x22/0x40 ? bpf_prog_dfc84bbde731b257_cil_sock4_connect+0x40a/0xacb ? xa_load+0x87/0xe0 ? __cgroup_bpf_run_filter_sock_addr+0xc1/0x1a0 ? release_sock+0x3e/0x90 ? sk_setsockopt+0x1a1/0x12f0 ? udp_pre_connect+0x36/0x50 ? inet_dgram_connect+0x93/0xa0 ? __sys_connect+0xb4/0xe0 ? udp_setsockopt+0x27/0x40 ? __pfx_udp_push_pending_frames+0x10/0x10 ? __sys_setsockopt+0xdf/0x1a0 ? __x64_sys_connect+0xf/0x20 ? do_syscall_64+0x3a/0x90 ? entry_SYSCALL_64_after_hwframe+0x72/0xdc Fixing this by disabling preemption in bpf_event_output. [1] https://github.com/cilium/cilium/issues/26756

Announced Source revision 1
Original source ↗

CVE-2023-54173

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-2023-54173

Linux

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

Affected versions
Not stated in this record
Fixed versions
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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": "2a916f2f546ca1c1e3323e2a4269307f6d9890eb",
        "lessThan": "3048cb0dc0cc9dc74ed93690dffef00733bcad5b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2a916f2f546ca1c1e3323e2a4269307f6d9890eb",
        "lessThan": "c81bdf8f9f2b002d217c3d5357cdea9f2b82ff90",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2a916f2f546ca1c1e3323e2a4269307f6d9890eb",
        "lessThan": "36dd8ca330b76585640ed32255a3c99f901e1502",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2a916f2f546ca1c1e3323e2a4269307f6d9890eb",
        "lessThan": "063c9ce8e74e07bf94f99cd13146f42867875e8b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2a916f2f546ca1c1e3323e2a4269307f6d9890eb",
        "lessThan": "d62cc390c2e99ae267ffe4b8d7e2e08b6c758c32",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/trace/bpf_trace.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.190",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.126",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.4.10",
        "versionType": "semver",
        "lessThanOrEqual": "6.4.*"
      },
      {
        "status": "unaffected",
        "version": "6.5",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/trace/bpf_trace.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2023-54173

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30355 · Revision 1
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