{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2024-36929", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-30T15:25:07.069Z", "datePublished": "2024-05-30T15:29:21.430Z", "dateUpdated": "2026-08-05T11:32:08.251Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:32:08.251Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: core: reject skb_copy(_expand) for fraglist GSO skbs\n\nSKB_GSO_FRAGLIST skbs must not be linearized, otherwise they become\ninvalid. Return NULL if such an skb is passed to skb_copy or\nskb_copy_expand, in order to prevent a crash on a potential later\ncall to skb_gso_segment." } ], "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 invalid skb is manufactured entirely from received UDP traffic — fraglist GRO aggregates remotely-sourced datagrams, and `udp_gro_receive` marks any UDP packet lacking a local socket as fraglist-eligible, so forwarded flows from arbitrary internet sources qualify. Bridge/overlay ports (VXLAN, GRE, L2TP) carrying such traffic mean the attacker need not sit on the victim's L2 segment.\nAC:L - The attacker fully controls both preconditions for GRO coalescing — sending back-to-back same-flow UDP datagrams is sufficient to build the fraglist skb, and the resulting `udp_hdr(seg->next)->dest` dereference on a NULL `seg->next` is deterministic, not layout- or timing-dependent. No memory grooming or race win is needed.\nPR:N - The entire path — NAPI GRO, `netif_receive_skb`, bridge/forwarding `skb_copy`, `validate_xmit_skb` → `skb_gso_segment` — runs in softirq on unauthenticated received packets. The attacker needs no account, credentials, or capability on the target.\nUI:N - Triggering requires only that the victim host receive and forward the attacker's UDP packets, which happens automatically in the receive/transmit softirq. No administrator or user action is involved.\nS:U - The fault occurs in the kernel's own network stack and its impact is confined to that kernel's security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:N - The failure is a NULL pointer dereference at a small fixed offset (`udp_hdr(NULL)->dest`), which faults immediately below `mmap_min_addr` rather than reading valid memory. No out-of-bounds read, uninitialized data, or kernel pointer is exposed to the attacker.\nI:N - Nothing is written outside the skb before the oops — only the packet's own UDP length field is updated in `__udp_gso_segment_list()`. There is no out-of-bounds write, use-after-free, or type confusion, so no control-flow-hijack or arbitrary-write primitive arises.\nA:H - The NULL dereference happens in softirq context on the transmit path, producing a kernel oops that on a forwarding device typically panics the machine (and is fatal with `panic_on_oops`). An unauthenticated attacker can repeat it at will with a UDP burst, causing complete loss of 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": "faa83a7797f06cefed86731ba4baa3b4dfdc06c1", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "c7af99cc21923a9650533c9d77265c8dd683a533", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "989bf6fd1e1d058e73a364dce1a0c53d33373f62", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "cfe34d86ef9765c388f145039006bb79b6c81ac6", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "aea5e2669c2863fdd8679c40ee310b3bcaa85aec", "status": "affected", "versionType": "git" }, { "version": "3a1296a38d0cf62bffb9a03c585cbd5dbf15d596", "lessThan": "d091e579b864fa790dd6a0cd537a22c383126681", "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": "5.10.217", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.159", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.91", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.31", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.10", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "5.10.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.159" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.8.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/faa83a7797f06cefed86731ba4baa3b4dfdc06c1" }, { "url": "https://git.kernel.org/stable/c/c7af99cc21923a9650533c9d77265c8dd683a533" }, { "url": "https://git.kernel.org/stable/c/989bf6fd1e1d058e73a364dce1a0c53d33373f62" }, { "url": "https://git.kernel.org/stable/c/cfe34d86ef9765c388f145039006bb79b6c81ac6" }, { "url": "https://git.kernel.org/stable/c/aea5e2669c2863fdd8679c40ee310b3bcaa85aec" }, { "url": "https://git.kernel.org/stable/c/d091e579b864fa790dd6a0cd537a22c383126681" } ], "title": "net: core: reject skb_copy(_expand) for fraglist GSO skbs", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-36929", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-06-04T15:42:14.703241Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:47:55.373Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/faa83a7797f06cefed86731ba4baa3b4dfdc06c1", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c7af99cc21923a9650533c9d77265c8dd683a533", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/989bf6fd1e1d058e73a364dce1a0c53d33373f62", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/cfe34d86ef9765c388f145039006bb79b6c81ac6", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/aea5e2669c2863fdd8679c40ee310b3bcaa85aec", 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"*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SCALANCE XCM-/XRM-/XCH-/XRH-300 family", "versions": [ { "status": "affected", "version": "0", "lessThan": "V3.1", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html" } ] } ] }, "dataVersion": "5.2" }