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bpf, sockmap: fix race in sock_map_free()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: fix race in sock_map_free() sock_map_free() calls release_sock(sk) without owning a reference on the socket. This can cause use-after-free as syzbot found [1] Jakub Sitnicki already took care of a similar issue in sock_hash_free() in commit 75e68e5bf2c7 ("bpf, sockhash: Synchronize delete from bucket list on map free") [1] refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 3785 at lib/refcount.c:31 refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 3785 Comm: kworker/u4:6 Not tainted 6.1.0-rc7-syzkaller-00103-gef4d3ea40565 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: events_unbound bpf_map_free_deferred RIP: 0010:refcount_warn_saturate+0x17c/0x1a0 lib/refcount.c:31 Code: 68 8b 31 c0 e8 75 71 15 fd 0f 0b e9 64 ff ff ff e8 d9 6e 4e fd c6 05 62 9c 3d 0a 01 48 c7 c7 80 bb 68 8b 31 c0 e8 54 71 15 fd <0f> 0b e9 43 ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a2 fe ff RSP: 0018:ffffc9000456fb60 EFLAGS: 00010246 RAX: eae59bab72dcd700 RBX: 0000000000000004 RCX: ffff8880207057c0 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffffffff816fdabd R09: fffff520008adee5 R10: fffff520008adee5 R11: 1ffff920008adee4 R12: 0000000000000004 R13: dffffc0000000000 R14: ffff88807b1c6c00 R15: 1ffff1100f638dcf FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000

Announced Source revision 1
Original source ↗

CVE-2022-50259

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-2022-50259

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": "20ae0cb8983b05136d5293c47fadc99a8ca8ca2d",
        "lessThan": "4cabc3af4a6f36c222fecb15858c1060e59218e7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b",
        "lessThan": "be719496ae6a7fc325e9e5056a52f63ebc84cc0c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b",
        "lessThan": "a443c55d96dede82a724df6e70a318ad15c199e1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b",
        "lessThan": "e8b2b392a646bf5cb9413c1cc7a39d99c1b65a62",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b",
        "lessThan": "5c3568166129bc73fd6b37748d2d8f95cd8f22f3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7e81a35302066c5a00b4c72d83e3ea4cad6eeb5b",
        "lessThan": "0a182f8d607464911756b4dbef5d6cad8de22469",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.4.14",
        "lessThan": "5.4.229",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/core/sock_map.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.5"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.5",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.229",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.163",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.86",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.0.16",
        "versionType": "semver",
        "lessThanOrEqual": "6.0.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.2",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/core/sock_map.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2022-50259

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30210 · Revision 1
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Publisher date
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