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xsk: Fix race condition in AF_XDP generic RX path

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: xsk: Fix race condition in AF_XDP generic RX path Move rx_lock from xsk_socket to xsk_buff_pool. Fix synchronization for shared umem mode in generic RX path where multiple sockets share single xsk_buff_pool. RX queue is exclusive to xsk_socket, while FILL queue can be shared between multiple sockets. This could result in race condition where two CPU cores access RX path of two different sockets sharing the same umem. Protect both queues by acquiring spinlock in shared xsk_buff_pool. Lock contention may be minimized in the future by some per-thread FQ buffering. It's safe and necessary to move spin_lock_bh(rx_lock) after xsk_rcv_check(): * xs->pool and spinlock_init is synchronized by xsk_bind() -> xsk_is_bound() memory barriers. * xsk_rcv_check() may return true at the moment of xsk_release() or xsk_unbind_dev(), however this will not cause any data races or race conditions. xsk_unbind_dev() removes xdp socket from all maps and waits for completion of all outstanding rx operations. Packets in RX path will either complete safely or drop.

Announced Source revision 1
Original source ↗

CVE-2025-37920

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-2025-37920

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": "bf0bdd1343efbbf65b4d53aef1fce14acbd79d50",
        "lessThan": "975b372313dc018b9bd6cc0d85d188787054b19e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bf0bdd1343efbbf65b4d53aef1fce14acbd79d50",
        "lessThan": "b6978c565ce33658543c637060852434b4248d30",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bf0bdd1343efbbf65b4d53aef1fce14acbd79d50",
        "lessThan": "65d3c570614b892257dc58a1b202908242ecf8fd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bf0bdd1343efbbf65b4d53aef1fce14acbd79d50",
        "lessThan": "75a240a3e8abf17b9e00b0ef0492b1bbaa932251",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bf0bdd1343efbbf65b4d53aef1fce14acbd79d50",
        "lessThan": "a1356ac7749cafc4e27aa62c0c4604b5dca4983e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fd7c22ba7a0ad898b9ecf77dd53f5ccc48492e35",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8a090e3b73eaffe18e08ccc3fb5abecf6b0a9781",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.1.20",
        "lessThan": "5.2",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.2.3",
        "lessThan": "5.3",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "include/net/xdp_sock.h",
      "include/net/xsk_buff_pool.h",
      "net/xdp/xsk.c",
      "net/xdp/xsk_buff_pool.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.3"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.3",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.164",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.123",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.28",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.14.6",
        "versionType": "semver",
        "lessThanOrEqual": "6.14.*"
      },
      {
        "status": "unaffected",
        "version": "6.15",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/net/xdp_sock.h",
      "include/net/xsk_buff_pool.h",
      "net/xdp/xsk.c",
      "net/xdp/xsk_buff_pool.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-37920

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30493 · Revision 1
Added to Heist Feed
Publisher date
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