CVE-2023-53698

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However, the reference to\nthe pool in the socket was not nulled. This means that when the socket\nis closed later, the socket teardown logic will think that there is a\npool attached to the socket and try to decrease the refcount again,\nleading to a refcount underflow.\n\nI chose this fix as it involved adding just a single line. Another\noption would have been to move xp_get_pool() and the assignment of\nxs->pool to after the if-statement and using xs_umem->pool instead of\nxs->pool in the whole if-statement resulting in somewhat simpler code,\nbut this would have led to much more churn in the code base perhaps\nmaking it harder to backport."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached through the AF_XDP `socket()`/`setsockopt()`/`bind()` syscall interface, a purely local kernel API with no network exposure.\nAC:L - The attacker controls both sockets and the Tx-ring allocation size, and can induce memory pressure and recreate the pool to retry, making the required allocation failure inducible and repeatable.\nPR:L - Creating the AF_XDP socket requires CAP_NET_RAW, but this is checked against `net->user_ns`, so an unprivileged local user obtains it via an unprivileged user+network namespace (`unshare -Urn`).\nUI:N - The attacker performs all socket setup, binding, and teardown steps itself; no action by another user is required.\nS:U - The corruption is confined to the kernel's own buffer-pool objects within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The premature free produces a use-after-free of the `xsk_buff_pool`; a reclaimed-and-sprayed allocation lets the attacker read freed-object contents, yielding arbitrary kernel memory disclosure.\nI:H - The use-after-free/double-free of the pool provides a write primitive (dangling refcount and pool fields) exploitable via heap spraying for kernel memory corruption and control-flow hijacking.\nA:H - The refcount underflow frees a pool still in use by another socket, reliably causing use-after-free memory corruption, oops, or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xdp/xsk.c"], "versions": [{"version": "f7019562f142bc041f9cde63af338d1886585923", "lessThan": "789fcd94c9cac133dd4d96e193188661aca9f6c3", "status": "affected", "versionType": "git"}, {"version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e", "lessThan": "15b453cf7348973217558235b9ece2ee5fea6777", "status": "affected", "versionType": "git"}, {"version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e", "lessThan": "3e7722c31d4167eb7f3ffd35aba52cab69b79072", "status": "affected", "versionType": "git"}, {"version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e", "lessThan": "85c2c79a07302fe68a1ad5cc449458cc559e314d", "status": "affected", "versionType": "git"}, {"version": "9f0c8a9d4ef1b9ebee0e4ac2495fe790727044aa", "status": "affected", "versionType": "git"}, {"version": "5.15.47", "lessThan": "5.15.127", "status": "affected", "versionType": "semver"}, {"version": "5.17.15", "lessThan": "5.18", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xdp/xsk.c"], "versions": [{"version": "5.18", "status": "affected"}, {"version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.127", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.46", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.4.11", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.47", "versionEndExcluding": "5.15.127"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.1.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.4.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/789fcd94c9cac133dd4d96e193188661aca9f6c3"}, {"url": "https://git.kernel.org/stable/c/15b453cf7348973217558235b9ece2ee5fea6777"}, {"url": "https://git.kernel.org/stable/c/3e7722c31d4167eb7f3ffd35aba52cab69b79072"}, {"url": "https://git.kernel.org/stable/c/85c2c79a07302fe68a1ad5cc449458cc559e314d"}], "title": "xsk: fix refcount underflow in error path", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2023-53698", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:36:35.978263Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:41:33.758Z"}}]}}

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If xp_alloc_tx_descs() fails,\nand it can only fail due to not having enough memory, then the error\npath is triggered. In this error path, the refcount of the pool is\ndecremented as it has incremented before. However, the reference to\nthe pool in the socket was not nulled. This means that when the socket\nis closed later, the socket teardown logic will think that there is a\npool attached to the socket and try to decrease the refcount again,\nleading to a refcount underflow.\n\nI chose this fix as it involved adding just a single line. Another\noption would have been to move xp_get_pool() and the assignment of\nxs->pool to after the if-statement and using xs_umem->pool instead of\nxs->pool in the whole if-statement resulting in somewhat simpler code,\nbut this would have led to much more churn in the code base perhaps\nmaking it harder to backport."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.127", "versionStartIncluding": "5.15.47"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.46", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.4.11", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.5", "versionStartIncluding": "5.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.17.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:15:36.147Z"}}}, "cveMetadata": {"cveId": "CVE-2023-53698", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:41:33.758Z", "dateReserved": "2025-10-22T13:21:37.345Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-10-22T13:23:38.384Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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If xp_alloc_tx_descs() fails,\nand it can only fail due to not having enough memory, then the error\npath is triggered. In this error path, the refcount of the pool is\ndecremented as it has incremented before. However, the reference to\nthe pool in the socket was not nulled. This means that when the socket\nis closed later, the socket teardown logic will think that there is a\npool attached to the socket and try to decrease the refcount again,\nleading to a refcount underflow.\n\nI chose this fix as it involved adding just a single line. Another\noption would have been to move xp_get_pool() and the assignment of\nxs->pool to after the if-statement and using xs_umem->pool instead of\nxs->pool in the whole if-statement resulting in somewhat simpler code,\nbut this would have led to much more churn in the code base perhaps\nmaking it harder to backport."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxsk: correcci\u00f3n de desbordamiento negativo del contador de referencias en la ruta de error\n\nCorrige un problema de desbordamiento negativo del contador de referencias reportado por syzbot que puede ocurrir cuando un sistema se queda sin memoria. Si xp_alloc_tx_descs() falla, y solo puede fallar por no tener suficiente memoria, entonces se activa la ruta de error. En esta ruta de error, el contador de referencias del pool se decrementa como se hab\u00eda incrementado antes. Sin embargo, la referencia al pool en el socket no fue anulada. Esto significa que cuando el socket se cierra m\u00e1s tarde, la l\u00f3gica de desmantelamiento del socket pensar\u00e1 que hay un pool adjunto al socket e intentar\u00e1 decrementar el contador de referencias de nuevo, lo que lleva a un desbordamiento negativo del contador de referencias.\n\nEleg\u00ed esta correcci\u00f3n ya que implicaba a\u00f1adir solo una l\u00ednea. Otra opci\u00f3n habr\u00eda sido mover xp_get_pool() y la asignaci\u00f3n de xs -> pool a despu\u00e9s de la sentencia if y usar xs_umem -> pool en lugar de xs -> pool en toda la sentencia if, lo que resultar\u00eda en un c\u00f3digo algo m\u00e1s simple, pero esto habr\u00eda provocado mucha m\u00e1s agitaci\u00f3n en la base de c\u00f3digo, quiz\u00e1s dificultando su retroportaci\u00f3n."}], "id": "CVE-2023-53698", "lastModified": "2026-10-28T19:10:00.193", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53698", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:36:35.978263Z", "version": "2.0.3"}}]}, "published": "2025-10-22T14:15:44.330", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/15b453cf7348973217558235b9ece2ee5fea6777"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3e7722c31d4167eb7f3ffd35aba52cab69b79072"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/789fcd94c9cac133dd4d96e193188661aca9f6c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85c2c79a07302fe68a1ad5cc449458cc559e314d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: xsk: fix refcount underflow in error path", "id": "2405730", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2405730"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53698", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-10-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53698\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53698\nhttps://lore.kernel.org/linux-cve-announce/2025102211-CVE-2023-53698-c1f4@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-10-23T10:07:35.382193+00:00", "updated": "2025-10-23T10:07:35.382228+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}