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geneve: Fix use-after-free in geneve_find_dev().

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: geneve: Fix use-after-free in geneve_find_dev(). syzkaller reported a use-after-free in geneve_find_dev() [0] without repro. geneve_configure() links struct geneve_dev.next to net_generic(net, geneve_net_id)->geneve_list. The net here could differ from dev_net(dev) if IFLA_NET_NS_PID, IFLA_NET_NS_FD, or IFLA_TARGET_NETNSID is set. When dev_net(dev) is dismantled, geneve_exit_batch_rtnl() finally calls unregister_netdevice_queue() for each dev in the netns, and later the dev is freed. However, its geneve_dev.next is still linked to the backend UDP socket netns. Then, use-after-free will occur when another geneve dev is created in the netns. Let's call geneve_dellink() instead in geneve_destroy_tunnels(). [0]: BUG: KASAN: slab-use-after-free in geneve_find_dev drivers/net/geneve.c:1295 [inline] BUG: KASAN: slab-use-after-free in geneve_configure+0x234/0x858 drivers/net/geneve.c:1343 Read of size 2 at addr ffff000054d6ee24 by task syz.1.4029/13441 CPU: 1 UID: 0 PID: 13441 Comm: syz.1.4029 Not tainted 6.13.0-g0ad9617c78ac #24 dc35ca22c79fb82e8e7bc5c9c9adafea898b1e3d Hardware name: linux,dummy-virt (DT) Call trace: show_stack+0x38/0x50 arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xbc/0x108 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x16c/0x6f0 mm/kasan/report.c:489 kasan_report+0xc0/0x120 mm/kasan/report.c:602 __asa

Announced Source revision 1
Original source ↗

CVE-2025-21858

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-2025-21858

Linux

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

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
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": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "d5e86e27de0936f3cb0a299ce519d993e9cf3886",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "5a0538ac6826807d6919f6aecbb8996c2865af2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "f74f6560146714241c6e167b03165ee77a86e316",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "904e746b2e7fa952ab8801b303ce826a63153d78",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "3ce92ca990cfac88a87c61df3cc0b5880e688ecf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "da9b0ae47f084014b1e4b3f31f70a0defd047ff3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "788dbca056a8783ec063da3c9d49a3a71c76c283",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d07dc79fe04a43d82a346ced6bbf07bdb523f1b",
        "lessThan": "9593172d93b9f91c362baec4643003dc29802929",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/geneve.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.291",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.235",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.179",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.130",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.17",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.13.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.13.*"
      },
      {
        "status": "unaffected",
        "version": "6.14",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/geneve.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-21858

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26959 · Revision 1
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Publisher date
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