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CVE-2026-64543 (GCVE-0-2026-64543)

Vulnerability from cvelistv5 – Published: 2026-07-27 20:10 – Updated: 2026-08-19 16:28
VLAI
Title
tipc: fix use-after-free of the discoverer in tipc_disc_rcv()
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: fix use-after-free of the discoverer in tipc_disc_rcv() bearer_disable() frees b->disc with tipc_disc_delete()'s plain kfree(), but tipc_disc_rcv() still dereferences b->disc in RX softirq under rcu_read_lock() (tipc_udp_recv -> tipc_rcv -> tipc_disc_rcv). L2 bearers are safe thanks to the synchronize_net() in tipc_disable_l2_media(), but the UDP bearer defers that call to the cleanup_bearer() workqueue, so the discoverer is freed with no grace period: BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149) Read of size 8 at addr ffff88802348b728 by task poc_tipc/184 <IRQ> tipc_disc_rcv (net/tipc/discover.c:149) tipc_rcv (net/tipc/node.c:2126) tipc_udp_recv (net/tipc/udp_media.c:391) udp_rcv (net/ipv4/udp.c:2643) ip_local_deliver_finish (net/ipv4/ip_input.c:241) </IRQ> Freed by task 181: kfree (mm/slub.c:6565) bearer_disable (net/tipc/bearer.c:418) tipc_nl_bearer_disable (net/tipc/bearer.c:1001) The bearer is freed with kfree_rcu(); free the discoverer the same way. Add an rcu_head to struct tipc_discoverer and free it and its skb from an RCU callback. Because the RCU callback (tipc_disc_free_rcu) lives in module text, a call_rcu() that is still pending when the tipc module is unloaded would invoke a freed function. Add an rcu_barrier() to tipc_exit() after the bearer subsystem has been torn down, so all pending discoverer callbacks have run before the module text goes away. Reachable from an unprivileged user namespace: the TIPCv2 genl family is netnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC and CONFIG_TIPC_MEDIA_UDP.
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: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < 380413cdfd29fb9fa486c82889132b680c4983c5 (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < f05b3f4c78370469286879c765f5a1dd39dbcd32 (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < 4da2ac7749411971e1b222b992da5a172ce45f98 (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < 5e215bf1c47fdddf8203a0fe80a0ed594065f101 (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < ec7d54d8cc1723921d671e3272b427c96366506f (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2 (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < b65289e1c3f352a9f92c6e19713ddd647e033253 (git)
Affected: 25b0b9c4e835ffaa65b61c3efe2e28acf84d0259 , < 1579342d71133da7f00daa02c75cebec7372097b (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix use-after-free of the discoverer in tipc_disc_rcv()\n\nbearer_disable() frees b-\u003edisc with tipc_disc_delete()\u0027s plain kfree(),\nbut tipc_disc_rcv() still dereferences b-\u003edisc in RX softirq under\nrcu_read_lock() (tipc_udp_recv -\u003e tipc_rcv -\u003e tipc_disc_rcv).\n\nL2 bearers are safe thanks to the synchronize_net() in\ntipc_disable_l2_media(), but the UDP bearer defers that call to the\ncleanup_bearer() workqueue, so the discoverer is freed with no grace\nperiod:\n\n BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149)\n Read of size 8 at addr ffff88802348b728 by task poc_tipc/184\n \u003cIRQ\u003e\n  tipc_disc_rcv (net/tipc/discover.c:149)\n  tipc_rcv (net/tipc/node.c:2126)\n  tipc_udp_recv (net/tipc/udp_media.c:391)\n  udp_rcv (net/ipv4/udp.c:2643)\n  ip_local_deliver_finish (net/ipv4/ip_input.c:241)\n \u003c/IRQ\u003e\n Freed by task 181:\n  kfree (mm/slub.c:6565)\n  bearer_disable (net/tipc/bearer.c:418)\n  tipc_nl_bearer_disable (net/tipc/bearer.c:1001)\n\nThe bearer is freed with kfree_rcu(); free the discoverer the same way.\nAdd an rcu_head to struct tipc_discoverer and free it and its skb from an\nRCU callback.\n\nBecause the RCU callback (tipc_disc_free_rcu) lives in module text, a\ncall_rcu() that is still pending when the tipc module is unloaded would\ninvoke a freed function. Add an rcu_barrier() to tipc_exit() after the\nbearer subsystem has been torn down, so all pending discoverer callbacks\nhave run before the module text goes away.\n\nReachable from an unprivileged user namespace: the TIPCv2 genl family is\nnetnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC\nand CONFIG_TIPC_MEDIA_UDP."
        }
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The free side is only reachable through the local TIPCv2 generic-netlink `BEARER_DISABLE` command (or netns teardown); a remote peer can supply the discovery packet that performs the use-after-free access but cannot itself cause `bearer_disable()` to run, so the complete attack requires local access.\nAC:L - The attacker controls both sides of the race \u2014 one thread floods TIPC discovery packets at the bearer\u0027s UDP port while another disables the bearer \u2014 and `bearer_disable()` clears `b-\u003eup` and then `kfree()`s the discoverer with no synchronization whatsoever, leaving a wide window that a multi-CPU packet flood hits reliably (a working PoC exists).\nPR:L - `tipc_genl_family` is `.netnsok = true` and the bearer enable/disable ops carry no `GENL_ADMIN_PERM` or other capability check, so an unprivileged user can do everything inside `unshare -Urn` after autoloading tipc via `socket(AF_TIPC, ...)`.\nUI:N - The attacking process performs both the bearer disable and the packet injection itself; no victim action or cooperating user is involved.\nS:U - The corruption stays within the kernel\u0027s own security authority \u2014 no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `d-\u003enet` is read from the freed slab object and dereferenced as a `struct net *`; after reclaiming the kmalloc-192 allocation with sprayed data the attacker gains a controlled-pointer dereference chain usable for arbitrary kernel memory disclosure.\nI:H - `msg_set_prevnode(buf_msg(d-\u003eskb), sugg_addr)` writes a wire-controlled 32-bit value through the dangling `d-\u003eskb` pointer, and `tipc_disc_add_dest()` takes a spinlock and increments a counter in freed memory \u2014 together a controlled-address/controlled-value write suitable for control-flow hijacking.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free in softirq context and, on production kernels, a corrupted-pointer dereference or spinlock manipulation on reclaimed memory leading to kernel panic."
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          "url": "https://git.kernel.org/stable/c/f05b3f4c78370469286879c765f5a1dd39dbcd32"
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          "url": "https://git.kernel.org/stable/c/1579342d71133da7f00daa02c75cebec7372097b"
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      ],
      "title": "tipc: fix use-after-free of the discoverer in tipc_disc_rcv()",
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    "datePublished": "2026-07-27T20:10:35.565Z",
    "dateReserved": "2026-07-19T15:36:31.795Z",
    "dateUpdated": "2026-08-19T16:28:28.342Z",
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix use-after-free of the discoverer in tipc_disc_rcv()\n\nbearer_disable() frees b-\u003edisc with tipc_disc_delete()\u0027s plain kfree(),\nbut tipc_disc_rcv() still dereferences b-\u003edisc in RX softirq under\nrcu_read_lock() (tipc_udp_recv -\u003e tipc_rcv -\u003e tipc_disc_rcv).\n\nL2 bearers are safe thanks to the synchronize_net() in\ntipc_disable_l2_media(), but the UDP bearer defers that call to the\ncleanup_bearer() workqueue, so the discoverer is freed with no grace\nperiod:\n\n BUG: KASAN: slab-use-after-free in tipc_disc_rcv (net/tipc/discover.c:149)\n Read of size 8 at addr ffff88802348b728 by task poc_tipc/184\n \u003cIRQ\u003e\n  tipc_disc_rcv (net/tipc/discover.c:149)\n  tipc_rcv (net/tipc/node.c:2126)\n  tipc_udp_recv (net/tipc/udp_media.c:391)\n  udp_rcv (net/ipv4/udp.c:2643)\n  ip_local_deliver_finish (net/ipv4/ip_input.c:241)\n \u003c/IRQ\u003e\n Freed by task 181:\n  kfree (mm/slub.c:6565)\n  bearer_disable (net/tipc/bearer.c:418)\n  tipc_nl_bearer_disable (net/tipc/bearer.c:1001)\n\nThe bearer is freed with kfree_rcu(); free the discoverer the same way.\nAdd an rcu_head to struct tipc_discoverer and free it and its skb from an\nRCU callback.\n\nBecause the RCU callback (tipc_disc_free_rcu) lives in module text, a\ncall_rcu() that is still pending when the tipc module is unloaded would\ninvoke a freed function. Add an rcu_barrier() to tipc_exit() after the\nbearer subsystem has been torn down, so all pending discoverer callbacks\nhave run before the module text goes away.\n\nReachable from an unprivileged user namespace: the TIPCv2 genl family is\nnetnsok and its bearer commands have no GENL_ADMIN_PERM. Needs CONFIG_TIPC\nand CONFIG_TIPC_MEDIA_UDP."
          }
        ],
        "id": "CVE-2026-64543",
        "lastModified": "2026-08-19T17:20:15.650",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-07-27T21:17:06.850",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1579342d71133da7f00daa02c75cebec7372097b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/380413cdfd29fb9fa486c82889132b680c4983c5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4da2ac7749411971e1b222b992da5a172ce45f98"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5e215bf1c47fdddf8203a0fe80a0ed594065f101"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a0c5fdeb5fa257f8c6d469af266bc087cb5de6a2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b65289e1c3f352a9f92c6e19713ddd647e033253"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ec7d54d8cc1723921d671e3272b427c96366506f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f05b3f4c78370469286879c765f5a1dd39dbcd32"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:27:53+00:00",
      "cve": "CVE-2026-64543",
      "id": "CVE-2026-64543",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tipc: fix use-after-free of the discoverer in tipc_disc_rcv()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64543.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:38:37Z",
      "cve": "CVE-2026-64543",
      "id": "CVE-2026-64543",
      "initial_release_date": "2026-07-28T17:08:03Z",
      "product_status:first_fixed": "104",
      "product_status:known_affected": "636",
      "product_status:known_not_affected": "97",
      "product_status:recommended": "111",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64543",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64543.json",
      "version": "11"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.