CVE-2026-74479 (GCVE-0-2026-74479)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47
VLAI
Title
net: pktgen: fix proc entry use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: net: pktgen: fix proc entry use-after-free pktgen_change_name() replaces pkt_dev->entry while holding t->if_lock. pktgen_remove_device() removes the same entry before _rem_dev_from_if_list() takes that lock. This allows the following interleaving: CPU 0 (NETDEV_CHANGENAME) CPU 1 (kpktgend) if_lock(t) proc_remove(pkt_dev->entry) proc_remove(pkt_dev->entry) pkt_dev->entry = proc_create_data(...) if_unlock(t) The kthread can pass the stale proc_dir_entry to proc_remove() after the rename path has freed it. A reproducer with a widened race window reports: BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80 Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67 Call Trace: proc_remove+0x78/0x80 pktgen_remove_device.isra.0+0x11c/0x4c0 pktgen_thread_worker+0x1214/0x6bc0 kthread+0x2c6/0x3b0 Allocated by task 95: __proc_create+0x204/0x790 proc_create_data+0x72/0xe0 pktgen_thread_write+0xd61/0x1510 Freed by task 28: kmem_cache_free+0xcb/0x3d0 proc_free_inode+0x5b/0x80 rcu_core+0x50a/0x1850 The buggy address belongs to the object at ffff8881478fea00 which belongs to the cache proc_dir_entry of size 192 Move proc_remove() into the if_lock-protected list removal helper. Keep it before list_del_rcu() to preserve the ordering required by add_device(). The rename path must then finish replacing the entry before removal, or it observes that the device is no longer on the list.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < 82ed3db9269cb61e3c15bad2f6e221efce90e1e0 (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < d1cc9797cf8f7aeb87e7ad01b748c6a960a819e4 (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < 7991c7cff8b8622cddb3d8dee07dbe74aa4cbec4 (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < 577443530cb592d5782a1f79847411a9363a65c8 (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < f85a58340b91f225de3299dfa782c6414098077c (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < 4ef801b838d85c0ea5852c50667f7344ce3b6cd0 (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < b006a5404470bd3eb2aa0425fc447183032047ef (git)
Affected: 39df232f1a9ba48d41c68ee7d4046756e709cf91 , < 817ff6efdb7f484ea547218e11e17d8e43daa3b4 (git)
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Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: pktgen: fix proc entry use-after-free\n\npktgen_change_name() replaces pkt_dev-\u003eentry while holding t-\u003eif_lock.\npktgen_remove_device() removes the same entry before\n_rem_dev_from_if_list() takes that lock.\n\nThis allows the following interleaving:\n\n  CPU 0 (NETDEV_CHANGENAME)       CPU 1 (kpktgend)\n  if_lock(t)\n  proc_remove(pkt_dev-\u003eentry)\n                                  proc_remove(pkt_dev-\u003eentry)\n  pkt_dev-\u003eentry = proc_create_data(...)\n  if_unlock(t)\n\nThe kthread can pass the stale proc_dir_entry to proc_remove() after the\nrename path has freed it. A reproducer with a widened race window reports:\n\n  BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80\n  Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67\n  Call Trace:\n   proc_remove+0x78/0x80\n   pktgen_remove_device.isra.0+0x11c/0x4c0\n   pktgen_thread_worker+0x1214/0x6bc0\n   kthread+0x2c6/0x3b0\n  Allocated by task 95:\n   __proc_create+0x204/0x790\n   proc_create_data+0x72/0xe0\n   pktgen_thread_write+0xd61/0x1510\n  Freed by task 28:\n   kmem_cache_free+0xcb/0x3d0\n   proc_free_inode+0x5b/0x80\n   rcu_core+0x50a/0x1850\n  The buggy address belongs to the object at ffff8881478fea00\n   which belongs to the cache proc_dir_entry of size 192\n\nMove proc_remove() into the if_lock-protected list removal helper. Keep it\nbefore list_del_rcu() to preserve the ordering required by add_device().\nThe rename path must then finish replacing the entry before removal, or\nit observes that the device is no longer on the list."
        }
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      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local access to /proc/net/pktgen procfs writes and a SIOCSIFNAME/ip-link rename of a pktgen-bound netdev; pktgen is configured only via local proc and ioctl paths, not via remote network packets.\nAC:L - The UAF is a race between pktgen_change_name() on NETDEV_CHANGENAME and pktgen_remove_device() in kpktgend; an attacker controls both sides concurrently via rem_device_all/unregister and interface rename, so success does not depend on uncontrollable timing.\nPR:L - Triggering rename needs ns_capable(CAP_NET_ADMIN) and pktgen proc writes are mode 0600; CAP_NET_ADMIN is obtainable by an unprivileged user via user/network namespaces (unshare -Urn), so real init-namespace root is not required.\nUI:N - No victim interaction is required; the attacker drives pktgen device add/remove and netdev rename/unregister directly through local proc writes and netlink/ioctl without needing another user to act.\nS:U - Impact is kernel slab corruption and potential privilege escalation within the same kernel security domain; it does not inherently cross VM, container, or IOMMU boundaries without additional unrelated primitives.\nC:H - The bug is a slab use-after-free of a proc_dir_entry in proc_remove(); KASAN shows reads of freed 192-byte objects, and UAF on proc metadata can be turned into arbitrary kernel memory disclosure via heap grooming.\nI:H - Corrupting or reusing the freed proc_dir_entry during proc_remove()/procfs teardown can enable attacker-controlled writes and control-flow hijack in kernel context, not merely a benign NULL dereference crash.\nA:H - Concurrent rename and removal causes proc_remove() to dereference a freed proc_dir_entry, producing KASAN slab-use-after-free and kernel oops/panic; even without full exploit development, the UAF reliably threatens system availability."
            }
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        "dateUpdated": "2026-08-23T12:47:23.408Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/817ff6efdb7f484ea547218e11e17d8e43daa3b4"
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      ],
      "title": "net: pktgen: fix proc entry use-after-free",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74479",
    "datePublished": "2026-08-15T12:27:13.172Z",
    "dateReserved": "2026-08-15T05:44:03.904Z",
    "dateUpdated": "2026-08-23T12:47:23.408Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74479",
      "date": "2026-08-28",
      "epss": "0.00126",
      "percentile": "0.0252"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T15:04:54.000Z",
      "cve": "CVE-2026-74479",
      "id": "msrc_CVE-2026-74479",
      "initial_release_date": "2026-08-23T15:04:54.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: pktgen: fix proc entry use-after-free",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74479.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74479\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:52.713\",\"lastModified\":\"2026-08-23T13:16:44.380\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: pktgen: fix proc entry use-after-free\\n\\npktgen_change_name() replaces pkt_dev-\u003eentry while holding t-\u003eif_lock.\\npktgen_remove_device() removes the same entry before\\n_rem_dev_from_if_list() takes that lock.\\n\\nThis allows the following interleaving:\\n\\n  CPU 0 (NETDEV_CHANGENAME)       CPU 1 (kpktgend)\\n  if_lock(t)\\n  proc_remove(pkt_dev-\u003eentry)\\n                                  proc_remove(pkt_dev-\u003eentry)\\n  pkt_dev-\u003eentry = proc_create_data(...)\\n  if_unlock(t)\\n\\nThe kthread can pass the stale proc_dir_entry to proc_remove() after the\\nrename path has freed it. A reproducer with a widened race window reports:\\n\\n  BUG: KASAN: slab-use-after-free in proc_remove+0x78/0x80\\n  Read of size 8 at addr ffff8881478fea70 by task kpktgend_0/67\\n  Call Trace:\\n   proc_remove+0x78/0x80\\n   pktgen_remove_device.isra.0+0x11c/0x4c0\\n   pktgen_thread_worker+0x1214/0x6bc0\\n   kthread+0x2c6/0x3b0\\n  Allocated by task 95:\\n   __proc_create+0x204/0x790\\n   proc_create_data+0x72/0xe0\\n   pktgen_thread_write+0xd61/0x1510\\n  Freed by task 28:\\n   kmem_cache_free+0xcb/0x3d0\\n   proc_free_inode+0x5b/0x80\\n   rcu_core+0x50a/0x1850\\n  The buggy address belongs to the object at ffff8881478fea00\\n   which belongs to the cache proc_dir_entry of size 192\\n\\nMove proc_remove() into the if_lock-protected list removal helper. Keep it\\nbefore list_del_rcu() to preserve the ordering required by add_device().\\nThe rename path must then finish replacing the entry before removal, or\\nit observes that the device is no longer on the list.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/pktgen.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"82ed3db9269cb61e3c15bad2f6e221efce90e1e0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"d1cc9797cf8f7aeb87e7ad01b748c6a960a819e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"7991c7cff8b8622cddb3d8dee07dbe74aa4cbec4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"577443530cb592d5782a1f79847411a9363a65c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"f85a58340b91f225de3299dfa782c6414098077c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"4ef801b838d85c0ea5852c50667f7344ce3b6cd0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"b006a5404470bd3eb2aa0425fc447183032047ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"39df232f1a9ba48d41c68ee7d4046756e709cf91\",\"lessThan\":\"817ff6efdb7f484ea547218e11e17d8e43daa3b4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/pktgen.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.22\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.22\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4ef801b838d85c0ea5852c50667f7344ce3b6cd0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/577443530cb592d5782a1f79847411a9363a65c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7991c7cff8b8622cddb3d8dee07dbe74aa4cbec4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/817ff6efdb7f484ea547218e11e17d8e43daa3b4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82ed3db9269cb61e3c15bad2f6e221efce90e1e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b006a5404470bd3eb2aa0425fc447183032047ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1cc9797cf8f7aeb87e7ad01b748c6a960a819e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f85a58340b91f225de3299dfa782c6414098077c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T08:23:37+00:00",
      "cve": "CVE-2026-74479",
      "id": "CVE-2026-74479",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: pktgen: fix proc entry use-after-free",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74479.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.