{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52991", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-03-27T16:40:15.741Z", "datePublished": "2025-03-27T16:43:26.991Z", "dateUpdated": "2026-08-05T09:12:18.633Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:18.633Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix NULL pointer in skb_segment_list\n\nCommit 3a1296a38d0c (\"net: Support GRO/GSO fraglist chaining.\")\nintroduced UDP listifyed GRO. The segmentation relies on frag_list being\nuntouched when passing through the network stack. This assumption can be\nbroken sometimes, where frag_list itself gets pulled into linear area,\nleaving frag_list being NULL. When this happens it can trigger\nfollowing NULL pointer dereference, and panic the kernel. Reverse the\ntest condition should fix it.\n\n[19185.577801][ C1] BUG: kernel NULL pointer dereference, address:\n...\n[19185.663775][ C1] RIP: 0010:skb_segment_list+0x1cc/0x390\n...\n[19185.834644][ C1] Call Trace:\n[19185.841730][ C1] \n[19185.848563][ C1] __udp_gso_segment+0x33e/0x510\n[19185.857370][ C1] inet_gso_segment+0x15b/0x3e0\n[19185.866059][ C1] skb_mac_gso_segment+0x97/0x110\n[19185.874939][ C1] __skb_gso_segment+0xb2/0x160\n[19185.883646][ C1] udp_queue_rcv_skb+0xc3/0x1d0\n[19185.892319][ C1] udp_unicast_rcv_skb+0x75/0x90\n[19185.900979][ C1] ip_protocol_deliver_rcu+0xd2/0x200\n[19185.910003][ C1] ip_local_deliver_finish+0x44/0x60\n[19185.918757][ C1] __netif_receive_skb_one_core+0x8b/0xa0\n[19185.927834][ C1] process_backlog+0x88/0x130\n[19185.935840][ C1] __napi_poll+0x27/0x150\n[19185.943447][ C1] net_rx_action+0x27e/0x5f0\n[19185.951331][ C1] ? mlx5_cq_tasklet_cb+0x70/0x160 [mlx5_core]\n[19185.960848][ C1] __do_softirq+0xbc/0x25d\n[19185.968607][ C1] irq_exit_rcu+0x83/0xb0\n[19185.976247][ C1] common_interrupt+0x43/0xa0\n[19185.984235][ C1] asm_common_interrupt+0x22/0x40\n...\n[19186.094106][ C1] " } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The crash occurs on the inbound UDP softirq path (udp_queue_rcv_skb → __skb_gso_segment → __udp_gso_segment → skb_segment_list) while processing packets received from the network, as shown in the mlx5 NIC call trace; a remote peer can deliver the triggering UDP datagrams.\nAC:L - On a realistic high-performance UDP deployment with rx-gro-list and datapath hooks that pull frag_list (BPF/NAT, as later fraglist fixes document), the attacker only needs to send a burst of aggregatable UDP packets to the listening service and can trigger the NULL deref reliably.\nPR:N - The vulnerable path runs during unauthenticated UDP receive/delivery before any application-level credentials are checked; the attacker needs no local account or capabilities on the target.\nUI:N - Exploitation requires only attacker-sent UDP packets; no victim user action such as mounting a filesystem or opening a file is needed.\nS:U - Impact is confined to the host kernel (oops/panic DoS) and does not cross a VM, IOMMU, or other security authority boundary.\nC:N - The bug is a pure NULL pointer dereference of frag_list with no out-of-bounds read or UAF object control that would disclose memory.\nI:N - The faulting access is a NULL dereference crash only; it does not provide a memory write or control-flow hijack primitive.\nA:H - Dereferencing NULL list_skb in skb_segment_list causes a kernel oops/panic, fully disrupting system availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/skbuff.c" ], "versions": [ { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "6446369fb9f083ce032448c5047da08e298b22e6", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "046de74f9af92ae9ffce75fa22a1795223f4fb54", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "888dad6f3e85e3b2f8389bd6478f181efc72534d", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "876e8ca8366735a604bac86ff7e2732fc9d85d2d", "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/core/skbuff.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.167", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.92", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.10", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "5.6", "versionEndExcluding": "5.10.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6446369fb9f083ce032448c5047da08e298b22e6" }, { "url": "https://git.kernel.org/stable/c/046de74f9af92ae9ffce75fa22a1795223f4fb54" }, { "url": "https://git.kernel.org/stable/c/888dad6f3e85e3b2f8389bd6478f181efc72534d" }, { "url": "https://git.kernel.org/stable/c/876e8ca8366735a604bac86ff7e2732fc9d85d2d" } ], "title": "net: fix NULL pointer in skb_segment_list", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52991", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:08:20.181820Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:17:04.316Z" } } ] } }