Vulnerability-Lookup

CVE-2026-74586 (GCVE-0-2026-74586)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40

Title

sctp: clear new_transport when removing a peer

Summary

In the Linux kernel, the following vulnerability has been resolved: sctp: clear new_transport when removing a peer sctp_process_asconf_param() stores a newly added peer transport in asoc->new_transport. After all parameters in the ASCONF chunk have been processed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the new transport. An authenticated ASCONF from a remote SCTP peer can add a transport and remove it again with a wildcard DEL-IP parameter in the same chunk. The wildcard deletion preserves the transport on which the ASCONF arrived, but removes the newly added transport through sctp_assoc_del_nonprimary_peers(). The removal does not clear asoc->new_transport, leaving it pointing to the removed transport. sctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points to the removed transport without holding a transport reference. During local address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on control_chunk_list. After the transport is freed by RCU, a successful ASCONF_ACK for the replacement address releases the queued HEARTBEAT and sctp_outq_select_transport() reads the freed transport's state. The issue was found during a static audit of SCTP objects. With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp] sctp_outq_flush+0x306/0x2c60 [sctp] sctp_transport_immediate_rtx+0xaf/0x260 [sctp] sctp_process_asconf_ack+0xa48/0xf70 [sctp] Allocated by task 197: sctp_transport_new+0x68/0x650 [sctp] sctp_assoc_add_peer+0x258/0x12a0 [sctp] sctp_process_asconf+0x5e9/0x1090 [sctp] Last potentially related work creation: __call_rcu_common.constprop.0+0x77/0xb70 sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp] sctp_process_asconf+0xd9c/0x1090 [sctp] The first invalid access was a four-byte read of transport->state at net/sctp/outqueue.c:833. The same reproducer completed the full authenticated ASCONF and local-address replacement sequence with this change without a KASAN report or oops. Clear new_transport when its peer is removed, before it can be used to create the HEARTBEAT.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c0f973bb5118dd1b1…
https://git.kernel.org/stable/c/3b539b317cd052236…
https://git.kernel.org/stable/c/db9d8e3b670f84175…
https://git.kernel.org/stable/c/31efa656cf6aface2…
https://git.kernel.org/stable/c/291accf36febce751…
https://git.kernel.org/stable/c/ca33df36aa0143a1d…
https://git.kernel.org/stable/c/163847552a571bd55…
https://git.kernel.org/stable/c/beb33f8ee1ca83acd…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < c0f973bb5118dd1b146cda3fcc8af6f6057befec (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < 3b539b317cd052236fed0350364ff1268996ba46 (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < db9d8e3b670f841755bc2018f178472dc6064d27 (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < 31efa656cf6aface26e88f038c14f22ee6ca1500 (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < 291accf36febce751021888de5f15090f4875b56 (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < ca33df36aa0143a1d04f57d2086020c12e7eddb7 (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < 163847552a571bd55094291f4ffcdc1de0f14a7b (git) Affected: 6af29ccc223b0feb6fc6112281c3fa3cdb1afddf , < beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3 (git)	guessed
Linux	Linux	Affected: 3.2 Unaffected: 0 , < 3.2 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)	guessed

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              "status": "unaffected",
              "version": "5.15.216",
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              "status": "unaffected",
              "version": "6.1.183",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc-\u003enew_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc-\u003enew_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk-\u003etransport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport\u0027s state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n  BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n  Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n  Call Trace:\n   sctp_outq_select_transport+0x549/0x8b0 [sctp]\n   sctp_outq_flush+0x306/0x2c60 [sctp]\n   sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n   sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n  Allocated by task 197:\n   sctp_transport_new+0x68/0x650 [sctp]\n   sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n   sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0+0x77/0xb70\n   sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n   sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport-\u003estate at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:N - The bug is triggered when a remote SCTP peer sends an authenticated ASCONF chunk that is processed via sctp_rcv() through the state machine into sctp_sf_do_asconf() and sctp_process_asconf(); this is standard network packet handling, not a local syscall or ioctl path.\nAC:L - The remote peer fully controls a single ASCONF containing ADD_IP followed by wildcard DEL-IP to add then remove a transport while leaving asoc-\u003enew_transport dangling; combined with routine SCTP local address replacement (src_out_of_asoc_ok), the KASAN reproducer hit the UAF in 2/2 runs.\nPR:N - Exploitation requires only being an established SCTP association peer sending SCTP-AUTH-protected ASCONF traffic negotiated during the normal handshake (or addip_noauth); no Linux account, capability, or init-namespace privilege is needed on the victim host.\nUI:N - No victim user action such as opening a file or mounting a filesystem is required; the kernel automatically processes attacker-crafted ASCONF packets on an existing SCTP association during normal server operation.\nS:U - Impact is confined to kernel heap corruption on the vulnerable host (slab UAF on sctp_transport) and potential privilege escalation within that kernel; it does not cross VM, container, or IOMMU security boundaries.\nC:H - KASAN reports slab-use-after-free with a 4-byte read of freed sctp_transport-\u003estate in sctp_outq_select_transport(); UAF on heap transport objects enables grooming for arbitrary kernel memory disclosure per kernel CVSS guidance.\nI:H - The dangling sctp_transport pointer is embedded in a queued HEARTBEAT control chunk without a reference; UAF on this heap object can be leveraged via heap spraying for arbitrary kernel writes and control-flow hijacking, not merely a bounded corruption.\nA:H - Dereferencing the freed transport during sctp_outq_flush() causes a reproducible kernel UAF/oops; remote peers can repeatedly trigger this against SCTP endpoints handling ADD-IP traffic, yielding denial of service or crash."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46"
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          "url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"
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      "title": "sctp: clear new_transport when removing a peer",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74586",
    "datePublished": "2026-08-22T15:31:39.094Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-08-25T05:40:12.552Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-74586",
      "date": "2026-08-24",
      "epss": "0.00177",
      "percentile": "0.07203"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:47:02.000Z",
      "cve": "CVE-2026-74586",
      "id": "msrc_CVE-2026-74586",
      "initial_release_date": "2026-08-24T01:02:33.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "sctp: clear new_transport when removing a peer",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74586.json",
      "version": "2"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74586\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:30.687\",\"lastModified\":\"2026-08-25T06:18:32.713\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsctp: clear new_transport when removing a peer\\n\\nsctp_process_asconf_param() stores a newly added peer transport in\\nasoc-\u003enew_transport. After all parameters in the ASCONF chunk have been\\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\\nnew transport.\\n\\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\\nwildcard deletion preserves the transport on which the ASCONF arrived, but\\nremoves the newly added transport through\\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\\nasoc-\u003enew_transport, leaving it pointing to the removed transport.\\n\\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk-\u003etransport points\\nto the removed transport without holding a transport reference. During\\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\\ncontrol_chunk_list. After the transport is freed by RCU, a successful\\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\\nsctp_outq_select_transport() reads the freed transport\u0027s state.\\n\\nThe issue was found during a static audit of SCTP objects. With an\\nauthenticated peer, the reproducer triggered the same KASAN report in 2\\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\\n\\n  BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\\n  Read of size 4 at addr ffff88800b9bd95c by task python3/197\\n\\n  Call Trace:\\n   sctp_outq_select_transport+0x549/0x8b0 [sctp]\\n   sctp_outq_flush+0x306/0x2c60 [sctp]\\n   sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\\n   sctp_process_asconf_ack+0xa48/0xf70 [sctp]\\n\\n  Allocated by task 197:\\n   sctp_transport_new+0x68/0x650 [sctp]\\n   sctp_assoc_add_peer+0x258/0x12a0 [sctp]\\n   sctp_process_asconf+0x5e9/0x1090 [sctp]\\n\\n  Last potentially related work creation:\\n   __call_rcu_common.constprop.0+0x77/0xb70\\n   sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\\n   sctp_process_asconf+0xd9c/0x1090 [sctp]\\n\\nThe first invalid access was a four-byte read of transport-\u003estate at\\nnet/sctp/outqueue.c:833. The same reproducer completed the full\\nauthenticated ASCONF and local-address replacement sequence with this\\nchange without a KASAN report or oops.\\n\\nClear new_transport when its peer is removed, before it can be used to\\ncreate the HEARTBEAT.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sctp/associola.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"c0f973bb5118dd1b146cda3fcc8af6f6057befec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"3b539b317cd052236fed0350364ff1268996ba46\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"db9d8e3b670f841755bc2018f178472dc6064d27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"31efa656cf6aface26e88f038c14f22ee6ca1500\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"291accf36febce751021888de5f15090f4875b56\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"ca33df36aa0143a1d04f57d2086020c12e7eddb7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"163847552a571bd55094291f4ffcdc1de0f14a7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6af29ccc223b0feb6fc6112281c3fa3cdb1afddf\",\"lessThan\":\"beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sctp/associola.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-25T06:02:38+00:00",
      "cve": "CVE-2026-74586",
      "id": "CVE-2026-74586",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: clear new_transport when removing a peer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74586.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-08-23T00:06:29Z",
      "cve": "CVE-2026-74586",
      "id": "CVE-2026-74586",
      "initial_release_date": "2026-08-23T00:06:29Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74586",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74586.json",
      "version": "2"
    }
  }
}

FKIE_CVE-2026-74586

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/associola.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c0f973bb5118dd1b146cda3fcc8af6f6057befec",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "3b539b317cd052236fed0350364ff1268996ba46",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "db9d8e3b670f841755bc2018f178472dc6064d27",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "31efa656cf6aface26e88f038c14f22ee6ca1500",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "291accf36febce751021888de5f15090f4875b56",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "ca33df36aa0143a1d04f57d2086020c12e7eddb7",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "163847552a571bd55094291f4ffcdc1de0f14a7b",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            },
            {
              "lessThan": "beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3",
              "status": "affected",
              "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/associola.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "lessThan": "3.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc-\u003enew_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc-\u003enew_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk-\u003etransport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport\u0027s state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n  BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n  Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n  Call Trace:\n   sctp_outq_select_transport+0x549/0x8b0 [sctp]\n   sctp_outq_flush+0x306/0x2c60 [sctp]\n   sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n   sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n  Allocated by task 197:\n   sctp_transport_new+0x68/0x650 [sctp]\n   sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n   sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0+0x77/0xb70\n   sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n   sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport-\u003estate at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT."
    }
  ],
  "id": "CVE-2026-74586",
  "lastModified": "2026-08-25T06:18:32.713",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:30.687",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-P4VF-G6H3-F897

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

sctp: clear new_transport when removing a peer

sctp_process_asconf_param() stores a newly added peer transport in asoc->new_transport. After all parameters in the ASCONF chunk have been processed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the new transport.

An authenticated ASCONF from a remote SCTP peer can add a transport and remove it again with a wildcard DEL-IP parameter in the same chunk. The wildcard deletion preserves the transport on which the ASCONF arrived, but removes the newly added transport through sctp_assoc_del_nonprimary_peers(). The removal does not clear asoc->new_transport, leaving it pointing to the removed transport.

sctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points to the removed transport without holding a transport reference. During local address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on control_chunk_list. After the transport is freed by RCU, a successful ASCONF_ACK for the replacement address releases the queued HEARTBEAT and sctp_outq_select_transport() reads the freed transport's state.

The issue was found during a static audit of SCTP objects. With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel:

BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197

Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp] sctp_outq_flush+0x306/0x2c60 [sctp] sctp_transport_immediate_rtx+0xaf/0x260 [sctp] sctp_process_asconf_ack+0xa48/0xf70 [sctp]

Allocated by task 197: sctp_transport_new+0x68/0x650 [sctp] sctp_assoc_add_peer+0x258/0x12a0 [sctp] sctp_process_asconf+0x5e9/0x1090 [sctp]

Last potentially related work creation: __call_rcu_common.constprop.0+0x77/0xb70 sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp] sctp_process_asconf+0xd9c/0x1090 [sctp]

The first invalid access was a four-byte read of transport->state at net/sctp/outqueue.c:833. The same reproducer completed the full authenticated ASCONF and local-address replacement sequence with this change without a KASAN report or oops.

Clear new_transport when its peer is removed, before it can be used to create the HEARTBEAT.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-74586"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:30Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc-\u003enew_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc-\u003enew_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk-\u003etransport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport\u0027s state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n  BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n  Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n  Call Trace:\n   sctp_outq_select_transport+0x549/0x8b0 [sctp]\n   sctp_outq_flush+0x306/0x2c60 [sctp]\n   sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n   sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n  Allocated by task 197:\n   sctp_transport_new+0x68/0x650 [sctp]\n   sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n   sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0+0x77/0xb70\n   sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n   sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport-\u003estate at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT.",
  "id": "GHSA-p4vf-g6h3-f897",
  "modified": "2026-08-25T06:31:21Z",
  "published": "2026-08-22T18:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74586"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-74586

Vulnerability from csaf_microsoft - Published: 2026-08-24 01:02 - Updated: 2026-08-24 14:47

Summary

sctp: clear new_transport when removing a peer

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-74586

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: 17084-1		—	None Available

References

4 references

URL	Category
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
https://support.microsoft.com/lifecycle	external
https://www.first.org/cvss	external
https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-74586 sctp: clear new_transport when removing a peer - VEX",
        "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74586.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "sctp: clear new_transport when removing a peer",
    "tracking": {
      "current_release_date": "2026-08-24T14:47:02.000Z",
      "generator": {
        "date": "2026-08-25T07:02:58.268Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-74586",
      "initial_release_date": "2026-08-24T01:02:33.000Z",
      "revision_history": [
        {
          "date": "2026-08-24T01:02:33.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-08-24T14:47:02.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "3.0",
                "product": {
                  "name": "Azure Linux 3.0",
                  "product_id": "17084"
                }
              }
            ],
            "category": "product_name",
            "name": "Azure Linux"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                "product": {
                  "name": "azl3 kernel 0:6.6.150.1-1.azl3",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "kernel"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "azl3 kernel 0:6.6.150.1-1.azl3 as a component of Azure Linux 3.0",
          "product_id": "17084-1"
        },
        "product_reference": "1",
        "relates_to_product_reference": "17084"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-74586",
      "notes": [
        {
          "category": "general",
          "text": "Linux",
          "title": "Assigning CNA"
        }
      ],
      "product_status": {
        "known_affected": [
          "17084-1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-74586 sctp: clear new_transport when removing a peer - VEX",
          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74586.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-08-24T01:02:33.000Z",
          "details": "There is no fix available for this vulnerability as of now",
          "product_ids": [
            "17084-1"
          ]
        }
      ],
      "title": "sctp: clear new_transport when removing a peer"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-74586 (GCVE-0-2026-74586)

FKIE_CVE-2026-74586

GHSA-P4VF-G6H3-F897

MSRC_CVE-2026-74586

Tags

Sightings

Nomenclature