CVE-2026-53175

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53175", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.389Z", "datePublished": "2026-06-25T08:38:52.034Z", "dateUpdated": "2026-09-01T12:04:57.559Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:44.673Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: frags: fix use-after-free caused by the fqdir_pre_exit() flush\n\nOn netns teardown, fqdir_pre_exit() walks the fqdir rhashtable and\nflushes every fragment queue that is not yet complete using\ninet_frag_queue_flush(). That helper frees all the skbs queued on the\nfragment queue but does not set INET_FRAG_COMPLETE, and leaves\nq->fragments_tail and q->last_run_head pointing at the freed skbs.\nThe queue itself stays in the rhashtable.\n\nfqdir_pre_exit() first lowers high_thresh to 0 to stop new queue lookups,\nbut it cannot stop a fragment that already obtained the queue through\ninet_frag_find() earlier and stalled just before taking the queue lock.\nOnce that fragment resumes after the flush and takes the queue lock,\nit passes the INET_FRAG_COMPLETE check and then dereferences the freed\nfragments_tail. inet_frag_queue_insert() reads FRAG_CB() and ->len of\nthat pointer and, on the append path, writes ->next_frag, causing a\nslab use-after-free. IPv6, nf_conntrack_reasm6 and 6lowpan reassembly\nshare the same flush path and are affected as well.\n\nReset rb_fragments, fragments_tail and last_run_head in\ninet_frag_queue_flush() so a flushed queue no longer points at the\nfreed skbs. A fragment that resumes after the flush and takes the\nqueue lock then finds an empty queue and starts a new run instead of\ndereferencing the freed fragments_tail. ip_frag_reinit() already\nperformed this reset after its own flush, so drop the now duplicate\ncode there."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:N - IPv4 and IPv6 fragment reassembly is reached by received network packets before transport-layer delivery, and the affected generic inet fragment code is shared by network-facing reassembly paths. A remote peer can supply the crafted fragmented traffic that reaches `inet_frag_queue_insert()`.\nAC:L - The vulnerable window is a race between a fragment that already found the queue and netns teardown flushing that queue. The race can be retried and, in attacker-controlled namespace/container scenarios, both fragmented traffic and namespace teardown/churn are attacker-controlled.\nPR:N - No authentication or capability check gates normal IPv4/IPv6 fragment receive and reassembly before the vulnerable queue insertion path. The packet-processing side is reachable pre-authentication by crafted fragmented traffic.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform another interactive action. Packet delivery and namespace teardown are kernel/system events.\nS:U - The corruption occurs inside the kernel network stack and impacts the same kernel security authority. This is not a guest-to-host, IOMMU, or other explicit security-scope crossing.\nC:H - The bug is a slab use-after-free involving freed `sk_buff` objects and stale queue pointers. Such memory corruption can be shaped into kernel memory disclosure primitives.\nI:H - The append path can write through the stale freed `fragments_tail` object via `next_frag`, producing kernel heap memory corruption. A UAF write primitive is sufficient to support control-flow hijack or arbitrary kernel data modification.\nA:H - Even without full exploitation, dereferencing and writing through freed skb memory can crash or oops the kernel. The fragment path can be triggered repeatedly with crafted traffic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/inet_fragment.c", "net/ipv4/ip_fragment.c"], "versions": [{"version": "22ee4010866da81aeee08e1ea3fddbe418feb212", "lessThan": "0e823ca0e7391630784ae7dd0981b7ad170a93d9", "status": "affected", "versionType": "git"}, {"version": "543555954b1ee8d1903a7020324efb41b0c97428", "lessThan": "c22599cc90e1cd5f8129c8670bd68a02ff7177b4", "status": "affected", "versionType": "git"}, {"version": "c70df25214ac9b32b53e18e6ae3b8f073ffa6903", "lessThan": "89b909e9704587bfecc1aab1d37e98faee03b9f9", "status": "affected", "versionType": "git"}, {"version": "006a5035b495dec008805df249f92c22c89c3d2e", "lessThan": "010c3313a4d178dc2d3ce958d2e5cb055e2864c1", "status": "affected", "versionType": "git"}, {"version": "006a5035b495dec008805df249f92c22c89c3d2e", "lessThan": "32594b09854970d7ba83eb2dc8c69a2edd158c8e", "status": "affected", "versionType": "git"}, {"version": "6.12.93", "lessThan": "6.12.94", "status": "affected", "versionType": "semver"}, {"version": "6.18.3", "lessThan": "6.18.36", "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/ipv4/inet_fragment.c", "net/ipv4/ip_fragment.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.12.93", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18.3", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0e823ca0e7391630784ae7dd0981b7ad170a93d9"}, {"url": "https://git.kernel.org/stable/c/c22599cc90e1cd5f8129c8670bd68a02ff7177b4"}, {"url": "https://git.kernel.org/stable/c/89b909e9704587bfecc1aab1d37e98faee03b9f9"}, {"url": "https://git.kernel.org/stable/c/010c3313a4d178dc2d3ce958d2e5cb055e2864c1"}, {"url": "https://git.kernel.org/stable/c/32594b09854970d7ba83eb2dc8c69a2edd158c8e"}], "title": "inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:6"], "defaultStatus": "unknown", "packageName": "kernel", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:7"], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:8"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:8"], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:9"], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:9"], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat"}], "datePublic": "2026-06-25T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A flaw was found in the Linux kernel's internet fragmentation code. This vulnerability, a use-after-free, occurs due to a timing issue during the shutdown of network namespaces. A local attacker could exploit this by manipulating network namespace operations, potentially leading to memory corruption. 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true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: frags: fix use-after-free caused by the fqdir_pre_exit() flush\n\nOn netns teardown, fqdir_pre_exit() walks the fqdir rhashtable and\nflushes every fragment queue that is not yet complete using\ninet_frag_queue_flush(). That helper frees all the skbs queued on the\nfragment queue but does not set INET_FRAG_COMPLETE, and leaves\nq->fragments_tail and q->last_run_head pointing at the freed skbs.\nThe queue itself stays in the rhashtable.\n\nfqdir_pre_exit() first lowers high_thresh to 0 to stop new queue lookups,\nbut it cannot stop a fragment that already obtained the queue through\ninet_frag_find() earlier and stalled just before taking the queue lock.\nOnce that fragment resumes after the flush and takes the queue lock,\nit passes the INET_FRAG_COMPLETE check and then dereferences the freed\nfragments_tail. inet_frag_queue_insert() reads FRAG_CB() and ->len of\nthat pointer and, on the append path, writes ->next_frag, causing a\nslab use-after-free. IPv6, nf_conntrack_reasm6 and 6lowpan reassembly\nshare the same flush path and are affected as well.\n\nReset rb_fragments, fragments_tail and last_run_head in\ninet_frag_queue_flush() so a flushed queue no longer points at the\nfreed skbs. A fragment that resumes after the flush and takes the\nqueue lock then finds an empty queue and starts a new run instead of\ndereferencing the freed fragments_tail. ip_frag_reinit() already\nperformed this reset after its own flush, so drop the now duplicate\ncode there."}], "id": "CVE-2026-53175", "lastModified": "2026-08-14T13:19:00.980", "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"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}, "published": "2026-06-25T09:16:34.840", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/010c3313a4d178dc2d3ce958d2e5cb055e2864c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0e823ca0e7391630784ae7dd0981b7ad170a93d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/32594b09854970d7ba83eb2dc8c69a2edd158c8e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89b909e9704587bfecc1aab1d37e98faee03b9f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c22599cc90e1cd5f8129c8670bd68a02ff7177b4"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-53175"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492840"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "tags": ["Third Party Advisory"], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53175.json"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-825"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush", "id": "2492840", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492840"}, "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": ["In the Linux kernel, the following vulnerability has been resolved:\ninet: frags: fix use-after-free caused by the fqdir_pre_exit() flush\nOn netns teardown, fqdir_pre_exit() walks the fqdir rhashtable and\nflushes every fragment queue that is not yet complete using\ninet_frag_queue_flush(). That helper frees all the skbs queued on the\nfragment queue but does not set INET_FRAG_COMPLETE, and leaves\nq->fragments_tail and q->last_run_head pointing at the freed skbs.\nThe queue itself stays in the rhashtable.\nfqdir_pre_exit() first lowers high_thresh to 0 to stop new queue lookups,\nbut it cannot stop a fragment that already obtained the queue through\ninet_frag_find() earlier and stalled just before taking the queue lock.\nOnce that fragment resumes after the flush and takes the queue lock,\nit passes the INET_FRAG_COMPLETE check and then dereferences the freed\nfragments_tail. inet_frag_queue_insert() reads FRAG_CB() and ->len of\nthat pointer and, on the append path, writes ->next_frag, causing a\nslab use-after-free. IPv6, nf_conntrack_reasm6 and 6lowpan reassembly\nshare the same flush path and are affected as well.\nReset rb_fragments, fragments_tail and last_run_head in\ninet_frag_queue_flush() so a flushed queue no longer points at the\nfreed skbs. A fragment that resumes after the flush and takes the\nqueue lock then finds an empty queue and starts a new run instead of\ndereferencing the freed fragments_tail. ip_frag_reinit() already\nperformed this reset after its own flush, so drop the now duplicate\ncode there."], "name": "CVE-2026-53175", "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": "Under investigation", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53175\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53175\nhttps://lore.kernel.org/linux-cve-announce/2026062553-CVE-2026-53175-6d20@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[22ee4010866da81aeee08e1ea3fddbe418feb212,0e823ca0e7391630784ae7dd0981b7ad170a93d9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[543555954b1ee8d1903a7020324efb41b0c97428,c22599cc90e1cd5f8129c8670bd68a02ff7177b4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c70df25214ac9b32b53e18e6ae3b8f073ffa6903,89b909e9704587bfecc1aab1d37e98faee03b9f9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[006a5035b495dec008805df249f92c22c89c3d2e,010c3313a4d178dc2d3ce958d2e5cb055e2864c1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[006a5035b495dec008805df249f92c22c89c3d2e,32594b09854970d7ba83eb2dc8c69a2edd158c8e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.93,6.12.94)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.18.3,6.18.36)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.94,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.36,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.13,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-25T12:30:06.246249+00:00", "updated": "2026-08-14T15:15:03.359118+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}