{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2024-36889", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-30T15:25:07.065Z", "datePublished": "2024-05-30T15:28:56.794Z", "dateUpdated": "2025-05-04T09:11:28.710Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T09:11:28.710Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure snd_nxt is properly initialized on connect\n\nChristoph reported a splat hinting at a corrupted snd_una:\n\n WARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 __mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\n Modules linked in:\n CPU: 1 PID: 38 Comm: kworker/1:1 Not tainted 6.9.0-rc1-gbbeac67456c9 #59\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\n Workqueue: events mptcp_worker\n RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\n Code: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8\n \t8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe\n \t<0f> 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9\n RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293\n RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4\n RDX: ffff8881003cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\n R10: 0000000000000000 R11: fefefefefefefeff R12: ffff888138ba8000\n R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000\n FS: 0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0\n Call Trace:\n <TASK>\n __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [inline]\n mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [inline]\n __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615\n mptcp_worker+0x434/0x740 net/mptcp/protocol.c:2767\n process_one_work+0x1e0/0x560 kernel/workqueue.c:3254\n process_scheduled_works kernel/workqueue.c:3335 [inline]\n worker_thread+0x3c7/0x640 kernel/workqueue.c:3416\n kthread+0x121/0x170 kernel/kthread.c:388\n ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243\n </TASK>\n\nWhen fallback to TCP happens early on a client socket, snd_nxt\nis not yet initialized and any incoming ack will copy such value\ninto snd_una. If the mptcp worker (dumbly) tries mptcp-level\nre-injection after such ack, that would unconditionally trigger a send\nbuffer cleanup using 'bad' snd_una values.\n\nWe could easily disable re-injection for fallback sockets, but such\ndumb behavior already helped catching a few subtle issues and a very\nlow to zero impact in practice.\n\nInstead address the issue always initializing snd_nxt (and write_seq,\nfor consistency) at connect time."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/protocol.c"], "versions": [{"version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "99951b62bf20cec9247f633a3bea898338b9e5b4", "status": "affected", "versionType": "git"}, {"version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "dc941fec0719d0471a5902424d6b2a17df233193", "status": "affected", "versionType": "git"}, {"version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "39ca83ed73db9edcc6d70c0dc7a73085a4725012", "status": "affected", "versionType": "git"}, {"version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "aa0c07c1f20e05b30019bff083ec43665536f06f", "status": "affected", "versionType": "git"}, {"version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "592f69b41766d366dbb8ff4ef5a67c4396527bbe", "status": "affected", "versionType": "git"}, {"version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "fb7a0d334894206ae35f023a82cad5a290fd7386", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mptcp/protocol.c"], "versions": [{"version": "5.9", "status": "affected"}, {"version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.218", "lessThanOrEqual": "5.10.*", 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"git"}, {"status": "affected", "version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "39ca83ed73db9edcc6d70c0dc7a73085a4725012", "versionType": "git"}, {"status": "affected", "version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "aa0c07c1f20e05b30019bff083ec43665536f06f", "versionType": "git"}, {"status": "affected", "version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "592f69b41766d366dbb8ff4ef5a67c4396527bbe", "versionType": "git"}, {"status": "affected", "version": "8fd738049ac3d67a937d36577763b47180aae1ad", "lessThan": "fb7a0d334894206ae35f023a82cad5a290fd7386", "versionType": "git"}], "programFiles": ["net/mptcp/protocol.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.9"}, {"status": "unaffected", "version": "0", "lessThan": "5.9", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.218", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.159", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.91", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.31", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.8.10", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/mptcp/protocol.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4"}, {"url": "https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193"}, {"url": "https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012"}, {"url": "https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f"}, {"url": "https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe"}, {"url": "https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386"}], "x_generator": {"engine": "bippy-5f407fcff5a0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: ensure snd_nxt is properly initialized on connect\n\nChristoph reported a splat hinting at a corrupted snd_una:\n\n WARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 __mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\n Modules linked in:\n CPU: 1 PID: 38 Comm: kworker/1:1 Not tainted 6.9.0-rc1-gbbeac67456c9 #59\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\n Workqueue: events mptcp_worker\n RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\n Code: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8\n \t8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe\n \t<0f> 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9\n RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293\n RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4\n RDX: ffff8881003cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001\n RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\n R10: 0000000000000000 R11: fefefefefefefeff R12: ffff888138ba8000\n R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000\n FS: 0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0\n Call Trace:\n <TASK>\n __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [inline]\n mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [inline]\n __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615\n mptcp_worker+0x434/0x740 net/mptcp/protocol.c:2767\n process_one_work+0x1e0/0x560 kernel/workqueue.c:3254\n process_scheduled_works kernel/workqueue.c:3335 [inline]\n worker_thread+0x3c7/0x640 kernel/workqueue.c:3416\n kthread+0x121/0x170 kernel/kthread.c:388\n ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243\n </TASK>\n\nWhen fallback to TCP happens early on a client socket, snd_nxt\nis not yet initialized and any incoming ack will copy such value\ninto snd_una. If the mptcp worker (dumbly) tries mptcp-level\nre-injection after such ack, that would unconditionally trigger a send\nbuffer cleanup using 'bad' snd_una values.\n\nWe could easily disable re-injection for fallback sockets, but such\ndumb behavior already helped catching a few subtle issues and a very\nlow to zero impact in practice.\n\nInstead address the issue always initializing snd_nxt (and write_seq,\nfor consistency) at connect time."}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-12-19T09:01:26.720Z"}}}, "cveMetadata": {"cveId": "CVE-2024-36889", "state": "PUBLISHED", "dateUpdated": "2024-12-19T09:01:26.720Z", "dateReserved": "2024-05-30T15:25:07.065Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-30T15:28:56.794Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

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If the mptcp worker (dumbly) tries mptcp-level\nre-injection after such ack, that would unconditionally trigger a send\nbuffer cleanup using 'bad' snd_una values.\n\nWe could easily disable re-injection for fallback sockets, but such\ndumb behavior already helped catching a few subtle issues and a very\nlow to zero impact in practice.\n\nInstead address the issue always initializing snd_nxt (and write_seq,\nfor consistency) at connect time."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: mptcp: aseg\u00farese de que snd_nxt se inicialice correctamente al conectar Christoph inform\u00f3 un s\u00edmbolo que indica un snd_una da\u00f1ado: ADVERTENCIA: CPU: 1 PID: 38 en net/mptcp/protocol.c:1005 __mptcp_clean_una +0x4b3/0x620 net/mptcp/protocol.c:1005 M\u00f3dulos vinculados en: CPU: 1 PID: 38 Comm: kworker/1:1 No contaminado 6.9.0-rc1-gbbeac67456c9 #59 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 01/04/2014 Cola de trabajo: eventos mptcp_worker RIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005 C\u00f3digo: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8 8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe &lt;0f&gt; 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9 RSP: 0018:ffffc9000013fd48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4 RDX: 3cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 00000000000000000 R11: fefefefefefefeff R12 : ffff888138ba8000 R13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000 FS: 00000000000000000(0000) GS:ffff88813bd00000(0000) nlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0 Rastreo de llamadas: __mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [en l\u00ednea] mptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [en l\u00ednea] __mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615 mptcp_worker+0x434/ 0x740 neto/ mptcp/protocol.c:2767 Process_one_work+0x1e0/0x560 kernel/workqueue.c:3254 Process_scheduled_works kernel/workqueue.c:3335 [en l\u00ednea] work_thread+0x3c7/0x640 kernel/workqueue.c:3416 kthread+0x121/0x170 kernel/kthread .c:388 ret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Cuando el retorno a TCP ocurre temprano en un socket de cliente , snd_nxt a\u00fan no est\u00e1 inicializado y cualquier confirmaci\u00f3n entrante copiar\u00e1 dicho valor en snd_una. Si el trabajador mptcp (tontamente) intenta la reinyecci\u00f3n a nivel de mptcp despu\u00e9s de tal confirmaci\u00f3n, eso desencadenar\u00eda incondicionalmente una sanitizaci\u00f3n del b\u00fafer de env\u00edo utilizando valores snd_una 'incorrectos'. Podr\u00edamos desactivar f\u00e1cilmente la reinyecci\u00f3n para los sockets de respaldo, pero un comportamiento tan tonto ya ayud\u00f3 a detectar algunos problemas sutiles y un impacto de muy bajo a cero en la pr\u00e1ctica. En su lugar, resuelva el problema siempre inicializando snd_nxt (y write_seq, para mantener la coherencia) en el momento de la conexi\u00f3n."}], "id": "CVE-2024-36889", "lastModified": "2025-12-17T03:30:38.827", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-05-30T16:15:12.410", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/39ca83ed73db9edcc6d70c0dc7a73085a4725012"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/592f69b41766d366dbb8ff4ef5a67c4396527bbe"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99951b62bf20cec9247f633a3bea898338b9e5b4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aa0c07c1f20e05b30019bff083ec43665536f06f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc941fec0719d0471a5902424d6b2a17df233193"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb7a0d334894206ae35f023a82cad5a290fd7386"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:5102", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.16.1.rt7.357.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:5101", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.16.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:6998", "cpe": "cpe:/o:redhat:rhel_aus:8.6", "package": "kernel-0:4.18.0-372.124.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:6998", "cpe": "cpe:/o:redhat:rhel_tus:8.6", "package": "kernel-0:4.18.0-372.124.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:6998", "cpe": "cpe:/o:redhat:rhel_e4s:8.6", "package": "kernel-0:4.18.0-372.124.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:10262", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.81.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-11-26T00:00:00Z"}, {"advisory": "RHSA-2024:8162", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.40.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-10-16T00:00:00Z"}, {"advisory": "RHSA-2024:8162", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.40.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-10-16T00:00:00Z"}, {"advisory": "RHSA-2024:8613", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.90.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-10-30T00:00:00Z"}, {"advisory": "RHSA-2024:8614", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.90.1.rt14.375.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-10-30T00:00:00Z"}], "bugzilla": {"description": "kernel: mptcp: ensure snd_nxt is properly initialized on connect", "id": "2284571", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2284571"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-665", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmptcp: ensure snd_nxt is properly initialized on connect\nChristoph reported a splat hinting at a corrupted snd_una:\nWARNING: CPU: 1 PID: 38 at net/mptcp/protocol.c:1005 __mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\nModules linked in:\nCPU: 1 PID: 38 Comm: kworker/1:1 Not tainted 6.9.0-rc1-gbbeac67456c9 #59\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014\nWorkqueue: events mptcp_worker\nRIP: 0010:__mptcp_clean_una+0x4b3/0x620 net/mptcp/protocol.c:1005\nCode: be 06 01 00 00 bf 06 01 00 00 e8 a8 12 e7 fe e9 00 fe ff ff e8\n8e 1a e7 fe 0f b7 ab 3e 02 00 00 e9 d3 fd ff ff e8 7d 1a e7 fe\n<0f> 0b 4c 8b bb e0 05 00 00 e9 74 fc ff ff e8 6a 1a e7 fe 0f 0b e9\nRSP: 0018:ffffc9000013fd48 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: ffff8881029bd280 RCX: ffffffff82382fe4\nRDX: ffff8881003cbd00 RSI: ffffffff823833c3 RDI: 0000000000000001\nRBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: fefefefefefefeff R12: ffff888138ba8000\nR13: 0000000000000106 R14: ffff8881029bd908 R15: ffff888126560000\nFS: 0000000000000000(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f604a5dae38 CR3: 0000000101dac002 CR4: 0000000000170ef0\nCall Trace:\n<TASK>\n__mptcp_clean_una_wakeup net/mptcp/protocol.c:1055 [inline]\nmptcp_clean_una_wakeup net/mptcp/protocol.c:1062 [inline]\n__mptcp_retrans+0x7f/0x7e0 net/mptcp/protocol.c:2615\nmptcp_worker+0x434/0x740 net/mptcp/protocol.c:2767\nprocess_one_work+0x1e0/0x560 kernel/workqueue.c:3254\nprocess_scheduled_works kernel/workqueue.c:3335 [inline]\nworker_thread+0x3c7/0x640 kernel/workqueue.c:3416\nkthread+0x121/0x170 kernel/kthread.c:388\nret_from_fork+0x44/0x50 arch/x86/kernel/process.c:147\nret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243\n</TASK>\nWhen fallback to TCP happens early on a client socket, snd_nxt\nis not yet initialized and any incoming ack will copy such value\ninto snd_una. If the mptcp worker (dumbly) tries mptcp-level\nre-injection after such ack, that would unconditionally trigger a send\nbuffer cleanup using 'bad' snd_una values.\nWe could easily disable re-injection for fallback sockets, but such\ndumb behavior already helped catching a few subtle issues and a very\nlow to zero impact in practice.\nInstead address the issue always initializing snd_nxt (and write_seq,\nfor consistency) at connect time."], "name": "CVE-2024-36889", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-36889\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-36889\nhttps://lore.kernel.org/linux-cve-announce/2024053033-CVE-2024-36889-222d@gregkh/T"], "threat_severity": "Moderate"}

{}