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bpf: Fix bpf_sk_select_reuseport() memory leak

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix bpf_sk_select_reuseport() memory leak As pointed out in the original comment, lookup in sockmap can return a TCP ESTABLISHED socket. Such TCP socket may have had SO_ATTACH_REUSEPORT_EBPF set before it was ESTABLISHED. In other words, a non-NULL sk_reuseport_cb does not imply a non-refcounted socket. Drop sk's reference in both error paths. unreferenced object 0xffff888101911800 (size 2048): comm "test_progs", pid 44109, jiffies 4297131437 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 9336483b): __kmalloc_noprof+0x3bf/0x560 __reuseport_alloc+0x1d/0x40 reuseport_alloc+0xca/0x150 reuseport_attach_prog+0x87/0x140 sk_reuseport_attach_bpf+0xc8/0x100 sk_setsockopt+0x1181/0x1990 do_sock_setsockopt+0x12b/0x160 __sys_setsockopt+0x7b/0xc0 __x64_sys_setsockopt+0x1b/0x30 do_syscall_64+0x93/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Announced Source revision 1
Original source ↗

CVE-2025-21683

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-2025-21683

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": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
        "lessThan": "bb36838dac7bb334a3f3d7eb29875593ec9473fc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
        "lessThan": "0ab52a8ca6e156a64c51b5e7456cac9a0ebfd9bf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
        "lessThan": "d0a3b3d1176d39218b8edb2a2d03164942ab9ccd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
        "lessThan": "b02e70be498b138e9c21701c2f33f4018ca7cd5e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
        "lessThan": "cccd51dd22574216e64e5d205489e634f86999f3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "64d85290d79c0677edb5a8ee2295b36c022fa5df",
        "lessThan": "b3af60928ab9129befa65e6df0310d27300942bf",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/core/filter.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": "5.10.234",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.177",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.127",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.74",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/filter.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-21683

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26906 · Revision 1
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Publisher date
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