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CVE-2026-80841 (GCVE-0-2026-80841)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-11 09:57
VLAI
Title
net/packet: defer vmalloc TX_RING free until skbs finish
Summary
In the Linux kernel, the following vulnerability has been resolved: net/packet: defer vmalloc TX_RING free until skbs finish AF_PACKET TX_RING skbs keep a raw pointer to their ring frame. The skb page references preserve page-backed ring blocks after pg_vec is freed, but they do not preserve a vmalloc mapping. tpacket_destruct_skb() currently drops the pending reference before writing the timestamp and TP_STATUS_AVAILABLE to the frame. Move the decrement after those stores. The smp_wmb() in __packet_set_status() orders the frame stores before the decrement. Also recheck pending TX frames under pg_vec_lock before non-closing ring replacement, so a racing send cannot add a pending skb between the initial check and the ring swap. Ring allocation can produce a mixture of page-backed and vmalloc-backed blocks. Allocate deferred-work storage during TX ring setup when the first vmalloc-backed block is encountered, and keep its pointer in the pg_vec allocation header. If allocation fails, return -ENOMEM from ring setup. On socket close, a non-NULL pointer identifies a vmalloc-backed vector without a scan. If TX skbs remain, defer the whole vector to system_long_wq. After pg_vec is detached, a late destructor can skip the pending decrement. Use socket write-memory accounting as the deferred lifetime gate instead: an skb remains charged through its final sock_wfree(), after all ring-frame accesses. The delayed work retains a socket reference and reschedules itself until no TX skbs remain. Move pending_refcnt release to packet_sock_destruct() so late skb destructors and deferred cleanup can safely use it after packet_release(). Page-backed teardown remains synchronous, and no lock is added to the TX completion hot path.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b013840810c221f2b0cf641d01531526052dc1fb , < ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 0189dce07db2dc059ae0570e06758ec4233c6e11 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 550d00aa58193fb649a09a9c9e338c685adad784 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 992cc9f94ca924089a506ba9b327caa9af797529 (git)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "versions": [
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              "version": "7.2.3",
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "3.14",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/packet: defer vmalloc TX_RING free until skbs finish\n\nAF_PACKET TX_RING skbs keep a raw pointer to their ring frame. The skb\npage references preserve page-backed ring blocks after pg_vec is freed,\nbut they do not preserve a vmalloc mapping.\n\ntpacket_destruct_skb() currently drops the pending reference before\nwriting the timestamp and TP_STATUS_AVAILABLE to the frame. Move the\ndecrement after those stores. The smp_wmb() in __packet_set_status()\norders the frame stores before the decrement.\n\nAlso recheck pending TX frames under pg_vec_lock before non-closing\nring replacement, so a racing send cannot add a pending skb between\nthe initial check and the ring swap.\n\nRing allocation can produce a mixture of page-backed and vmalloc-backed\nblocks. Allocate deferred-work storage during TX ring setup when the\nfirst vmalloc-backed block is encountered, and keep its pointer in the\npg_vec allocation header. If allocation fails, return -ENOMEM from ring\nsetup. On socket close, a non-NULL pointer identifies a vmalloc-backed\nvector without a scan. If TX skbs remain, defer the whole vector to\nsystem_long_wq.\n\nAfter pg_vec is detached, a late destructor can skip the pending\ndecrement. Use socket write-memory accounting as the deferred lifetime\ngate instead: an skb remains charged through its final sock_wfree(),\nafter all ring-frame accesses. The delayed work retains a socket\nreference and reschedules itself until no TX skbs remain.\n\nMove pending_refcnt release to packet_sock_destruct() so late skb\ndestructors and deferred cleanup can safely use it after\npacket_release(). Page-backed teardown remains synchronous, and no lock\nis added to the TX completion hot path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T09:57:07.051Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0189dce07db2dc059ae0570e06758ec4233c6e11"
        },
        {
          "url": "https://git.kernel.org/stable/c/550d00aa58193fb649a09a9c9e338c685adad784"
        },
        {
          "url": "https://git.kernel.org/stable/c/992cc9f94ca924089a506ba9b327caa9af797529"
        }
      ],
      "title": "net/packet: defer vmalloc TX_RING free until skbs finish",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80841",
    "datePublished": "2026-09-04T15:54:51.459Z",
    "dateReserved": "2026-08-26T14:34:25.796Z",
    "dateUpdated": "2026-09-11T09:57:07.051Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80841",
      "date": "2026-09-15",
      "epss": "0.00168",
      "percentile": "0.06399"
    },
    "microsoft_vex": {
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      "cve": "CVE-2026-80841",
      "id": "msrc_CVE-2026-80841",
      "initial_release_date": "2026-09-06T04:36:24.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/packet: defer vmalloc TX_RING free until skbs finish",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80841.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80841\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:12.607\",\"lastModified\":\"2026-09-11T10:16:51.720\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/packet: defer vmalloc TX_RING free until skbs finish\\n\\nAF_PACKET TX_RING skbs keep a raw pointer to their ring frame. The skb\\npage references preserve page-backed ring blocks after pg_vec is freed,\\nbut they do not preserve a vmalloc mapping.\\n\\ntpacket_destruct_skb() currently drops the pending reference before\\nwriting the timestamp and TP_STATUS_AVAILABLE to the frame. Move the\\ndecrement after those stores. The smp_wmb() in __packet_set_status()\\norders the frame stores before the decrement.\\n\\nAlso recheck pending TX frames under pg_vec_lock before non-closing\\nring replacement, so a racing send cannot add a pending skb between\\nthe initial check and the ring swap.\\n\\nRing allocation can produce a mixture of page-backed and vmalloc-backed\\nblocks. Allocate deferred-work storage during TX ring setup when the\\nfirst vmalloc-backed block is encountered, and keep its pointer in the\\npg_vec allocation header. If allocation fails, return -ENOMEM from ring\\nsetup. On socket close, a non-NULL pointer identifies a vmalloc-backed\\nvector without a scan. If TX skbs remain, defer the whole vector to\\nsystem_long_wq.\\n\\nAfter pg_vec is detached, a late destructor can skip the pending\\ndecrement. Use socket write-memory accounting as the deferred lifetime\\ngate instead: an skb remains charged through its final sock_wfree(),\\nafter all ring-frame accesses. The delayed work retains a socket\\nreference and reschedules itself until no TX skbs remain.\\n\\nMove pending_refcnt release to packet_sock_destruct() so late skb\\ndestructors and deferred cleanup can safely use it after\\npacket_release(). Page-backed teardown remains synchronous, and no lock\\nis added to the TX completion hot path.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/packet/af_packet.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b013840810c221f2b0cf641d01531526052dc1fb\",\"lessThan\":\"ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b013840810c221f2b0cf641d01531526052dc1fb\",\"lessThan\":\"0189dce07db2dc059ae0570e06758ec4233c6e11\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b013840810c221f2b0cf641d01531526052dc1fb\",\"lessThan\":\"550d00aa58193fb649a09a9c9e338c685adad784\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b013840810c221f2b0cf641d01531526052dc1fb\",\"lessThan\":\"992cc9f94ca924089a506ba9b327caa9af797529\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/packet/af_packet.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.51\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0189dce07db2dc059ae0570e06758ec4233c6e11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/550d00aa58193fb649a09a9c9e338c685adad784\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/992cc9f94ca924089a506ba9b327caa9af797529\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed25ed29034ddc3dbe451ccbaa58ab9932f99d8b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T01:50:48Z",
      "cve": "CVE-2026-80841",
      "id": "CVE-2026-80841",
      "initial_release_date": "2026-09-08T23:58:10Z",
      "product_status:known_affected": "337",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80841",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80841.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

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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.