CVE-2025-39874 (GCVE-0-2025-39874)

Vulnerability from cvelistv5 – Published: 2025-09-23 06:00 – Updated: 2025-09-29 06:01
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: macsec: sync features on RTM_NEWLINK Syzkaller managed to lock the lower device via ETHTOOL_SFEATURES: netdev_lock include/linux/netdevice.h:2761 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] netdev_sync_lower_features net/core/dev.c:10649 [inline] __netdev_update_features+0xcb1/0x1be0 net/core/dev.c:10819 netdev_update_features+0x6d/0xe0 net/core/dev.c:10876 macsec_notify+0x2f5/0x660 drivers/net/macsec.c:4533 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] netdev_features_change+0x85/0xc0 net/core/dev.c:1570 __dev_ethtool net/ethtool/ioctl.c:3469 [inline] dev_ethtool+0x1536/0x19b0 net/ethtool/ioctl.c:3502 dev_ioctl+0x392/0x1150 net/core/dev_ioctl.c:759 It happens because lower features are out of sync with the upper: __dev_ethtool (real_dev) netdev_lock_ops(real_dev) ETHTOOL_SFEATURES __netdev_features_change netdev_sync_upper_features disable LRO on the lower if (old_features != dev->features) netdev_features_change fires NETDEV_FEAT_CHANGE macsec_notify NETDEV_FEAT_CHANGE netdev_update_features (for each macsec dev) netdev_sync_lower_features if (upper_features != lower_features) netdev_lock_ops(lower) # lower == real_dev stuck ... netdev_unlock_ops(real_dev) Per commit af5f54b0ef9e ("net: Lock lower level devices when updating features"), we elide the lock/unlock when the upper and lower features are synced. Makes sure the lower (real_dev) has proper features after the macsec link has been created. This makes sure we never hit the situation where we need to sync upper flags to the lower.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7e4d784f5810bba76c4593791028e13cce4af547 , < d7624629ccf47135c65fef0701fa0d9a115b87f3 (git)
Affected: 7e4d784f5810bba76c4593791028e13cce4af547 , < 0f82c3ba66c6b2e3cde0f255156a753b108ee9dc (git)
Create a notification for this product.
    Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.16.8 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/macsec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d7624629ccf47135c65fef0701fa0d9a115b87f3",
              "status": "affected",
              "version": "7e4d784f5810bba76c4593791028e13cce4af547",
              "versionType": "git"
            },
            {
              "lessThan": "0f82c3ba66c6b2e3cde0f255156a753b108ee9dc",
              "status": "affected",
              "version": "7e4d784f5810bba76c4593791028e13cce4af547",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/macsec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: sync features on RTM_NEWLINK\n\nSyzkaller managed to lock the lower device via ETHTOOL_SFEATURES:\n\n netdev_lock include/linux/netdevice.h:2761 [inline]\n netdev_lock_ops include/net/netdev_lock.h:42 [inline]\n netdev_sync_lower_features net/core/dev.c:10649 [inline]\n __netdev_update_features+0xcb1/0x1be0 net/core/dev.c:10819\n netdev_update_features+0x6d/0xe0 net/core/dev.c:10876\n macsec_notify+0x2f5/0x660 drivers/net/macsec.c:4533\n notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85\n call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]\n call_netdevice_notifiers net/core/dev.c:2281 [inline]\n netdev_features_change+0x85/0xc0 net/core/dev.c:1570\n __dev_ethtool net/ethtool/ioctl.c:3469 [inline]\n dev_ethtool+0x1536/0x19b0 net/ethtool/ioctl.c:3502\n dev_ioctl+0x392/0x1150 net/core/dev_ioctl.c:759\n\nIt happens because lower features are out of sync with the upper:\n\n  __dev_ethtool (real_dev)\n    netdev_lock_ops(real_dev)\n    ETHTOOL_SFEATURES\n      __netdev_features_change\n        netdev_sync_upper_features\n          disable LRO on the lower\n    if (old_features != dev-\u003efeatures)\n      netdev_features_change\n        fires NETDEV_FEAT_CHANGE\n\tmacsec_notify\n\t  NETDEV_FEAT_CHANGE\n\t    netdev_update_features (for each macsec dev)\n\t      netdev_sync_lower_features\n\t        if (upper_features != lower_features)\n\t          netdev_lock_ops(lower) # lower == real_dev\n\t\t  stuck\n\t\t  ...\n\n    netdev_unlock_ops(real_dev)\n\nPer commit af5f54b0ef9e (\"net: Lock lower level devices when updating\nfeatures\"), we elide the lock/unlock when the upper and lower features\nare synced. Makes sure the lower (real_dev) has proper features after\nthe macsec link has been created. This makes sure we never hit the\nsituation where we need to sync upper flags to the lower."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T06:01:31.845Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d7624629ccf47135c65fef0701fa0d9a115b87f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f82c3ba66c6b2e3cde0f255156a753b108ee9dc"
        }
      ],
      "title": "macsec: sync features on RTM_NEWLINK",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39874",
    "datePublished": "2025-09-23T06:00:46.690Z",
    "dateReserved": "2025-04-16T07:20:57.144Z",
    "dateUpdated": "2025-09-29T06:01:31.845Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39874\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-23T06:15:46.813\",\"lastModified\":\"2025-09-24T18:11:24.520\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmacsec: sync features on RTM_NEWLINK\\n\\nSyzkaller managed to lock the lower device via ETHTOOL_SFEATURES:\\n\\n netdev_lock include/linux/netdevice.h:2761 [inline]\\n netdev_lock_ops include/net/netdev_lock.h:42 [inline]\\n netdev_sync_lower_features net/core/dev.c:10649 [inline]\\n __netdev_update_features+0xcb1/0x1be0 net/core/dev.c:10819\\n netdev_update_features+0x6d/0xe0 net/core/dev.c:10876\\n macsec_notify+0x2f5/0x660 drivers/net/macsec.c:4533\\n notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85\\n call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]\\n call_netdevice_notifiers net/core/dev.c:2281 [inline]\\n netdev_features_change+0x85/0xc0 net/core/dev.c:1570\\n __dev_ethtool net/ethtool/ioctl.c:3469 [inline]\\n dev_ethtool+0x1536/0x19b0 net/ethtool/ioctl.c:3502\\n dev_ioctl+0x392/0x1150 net/core/dev_ioctl.c:759\\n\\nIt happens because lower features are out of sync with the upper:\\n\\n  __dev_ethtool (real_dev)\\n    netdev_lock_ops(real_dev)\\n    ETHTOOL_SFEATURES\\n      __netdev_features_change\\n        netdev_sync_upper_features\\n          disable LRO on the lower\\n    if (old_features != dev-\u003efeatures)\\n      netdev_features_change\\n        fires NETDEV_FEAT_CHANGE\\n\\tmacsec_notify\\n\\t  NETDEV_FEAT_CHANGE\\n\\t    netdev_update_features (for each macsec dev)\\n\\t      netdev_sync_lower_features\\n\\t        if (upper_features != lower_features)\\n\\t          netdev_lock_ops(lower) # lower == real_dev\\n\\t\\t  stuck\\n\\t\\t  ...\\n\\n    netdev_unlock_ops(real_dev)\\n\\nPer commit af5f54b0ef9e (\\\"net: Lock lower level devices when updating\\nfeatures\\\"), we elide the lock/unlock when the upper and lower features\\nare synced. Makes sure the lower (real_dev) has proper features after\\nthe macsec link has been created. This makes sure we never hit the\\nsituation where we need to sync upper flags to the lower.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f82c3ba66c6b2e3cde0f255156a753b108ee9dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d7624629ccf47135c65fef0701fa0d9a115b87f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.