CVE-2025-37749

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-37749", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.937Z", "datePublished": "2025-05-01T12:55:55.316Z", "dateUpdated": "2026-08-05T11:57:13.771Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:57:13.771Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\n\nEnsure we have enough data in linear buffer from skb before accessing\ninitial bytes. This prevents potential out-of-bounds accesses\nwhen processing short packets.\n\nWhen ppp_sync_txmung receives an incoming package with an empty\npayload:\n(remote) gef\u27a4 p *(struct pppoe_hdr *) (skb->head + skb->network_header)\n$18 = {\n\ttype = 0x1,\n\tver = 0x1,\n\tcode = 0x0,\n\tsid = 0x2,\n length = 0x0,\n\ttag = 0xffff8880371cdb96\n}\n\nfrom the skb struct (trimmed)\n tail = 0x16,\n end = 0x140,\n head = 0xffff88803346f400 \"4\",\n data = 0xffff88803346f416 \":\\377\",\n truesize = 0x380,\n len = 0x0,\n data_len = 0x0,\n mac_len = 0xe,\n hdr_len = 0x0,\n\nit is not safe to access data[2].\n\n[pabeni@redhat.com: fixed subj typo]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable function is reached from `ppp_input()` via `ppp_channel_bridge_input()`, which forwards remotely received PPP frames directly to the sync-tty channel's `start_xmit` before any length validation; the feeding channels include pppol2tp (UDP/IP) and pptp (GRE/IP), both routable across the internet on VPN concentrators. A remote peer sending a PPP payload shorter than 3 bytes triggers the read.\nAC:L - The trigger is fully deterministic and entirely attacker-controlled \u2014 emit one PPP frame with a zero-length or 1-2 byte payload; there is no race, no memory-layout requirement, and no state the attacker cannot influence.\nPR:N - PPPoE/PPTP/L2TP session establishment happens before any PPP-layer authentication (LCP/CHAP/PAP), so the malformed frame can be sent by an unauthenticated peer on an established but not-yet-authenticated session. No local account or capability is needed.\nUI:N - The out-of-bounds read occurs during normal packet transmit processing driven entirely by the attacker's inbound frame. No victim action is required.\nS:U - The impact is confined to the kernel's own security authority \u2014 a kernel-memory read within the same host. No VM, IOMMU, or sandbox boundary is crossed.\nC:L - The read is strictly bounded to at most 3 bytes past the valid skb data, and those bytes are never transmitted \u2014 they only influence the `islcp`/protocol-compression branches, giving an indirect oracle over adjacent (possibly uninitialized) kernel heap contents rather than an arbitrary read primitive.\nI:N - The defect is read-only; `skb_pull()` is length-checked via `skb_pull_inline()` so `skb->len` cannot underflow, and the subsequent `skb_push()` is guarded by an explicit `skb_headroom()` check, leaving no out-of-bounds write or corrupted state.\nA:H - The out-of-bounds access is syzbot-reproducible and trips KASAN/KMSAN, causing an oops or panic on sanitizer-enabled and hardened kernels (panic_on_oops/panic_on_warn), and it can be triggered repeatedly by an unauthenticated remote peer."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821"}], "title": "net: ppp: Add bound checking for skb data on ppp_sync_txmung", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:54:24.795Z"}}]}}

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vulnerability has been resolved:\n\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\n\nEnsure we have enough data in linear buffer from skb before accessing\ninitial bytes. This prevents potential out-of-bounds accesses\nwhen processing short packets.\n\nWhen ppp_sync_txmung receives an incoming package with an empty\npayload:\n(remote) gef\u27a4 p *(struct pppoe_hdr *) (skb->head + skb->network_header)\n$18 = {\n\ttype = 0x1,\n\tver = 0x1,\n\tcode = 0x0,\n\tsid = 0x2,\n length = 0x0,\n\ttag = 0xffff8880371cdb96\n}\n\nfrom the skb struct (trimmed)\n tail = 0x16,\n end = 0x140,\n head = 0xffff88803346f400 \"4\",\n data = 0xffff88803346f416 \":\\377\",\n truesize = 0x380,\n len = 0x0,\n data_len = 0x0,\n mac_len = 0xe,\n hdr_len = 0x0,\n\nit is not safe to access data[2].\n\n[pabeni@redhat.com: fixed subj typo]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ppp: Se ha a\u00f1adido la comprobaci\u00f3n de los l\u00edmites para datos de skb en ppp_sync_txmung. Se garantiza que haya suficientes datos en el b\u00fafer lineal de skb antes de acceder a los bytes iniciales. Esto evita posibles accesos fuera de los l\u00edmites al procesar paquetes cortos. Cuando ppp_sync_txmung recibe un paquete entrante con un payload vac\u00eda: (remoto) gef? p *(struct pppoe_hdr *) (skb->head + skb->network_header) $18 = { type = 0x1, ver = 0x1, code = 0x0, sid = 0x2, length = 0x0, tag = 0xffff8880371cdb96 } de la estructura skb (recortada) tail = 0x16, end = 0x140, head = 0xffff88803346f400 \"4\", data = 0xffff88803346f416 \":\\377\", truesize = 0x380, len = 0x0, data_len = 0x0, mac_len = 0xe, hdr_len = 0x0, no es seguro acceder a los datos[2]. [pabeni@redhat.com: error tipogr\u00e1fico corregido]"}], "id": "CVE-2025-37749", "lastModified": "2026-07-30T06:22:18.620", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-01T13:15:53.633", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f6eb9fa87a781d5370c0de7794ae242f1a95ee5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/529401c8f12ecc35f9ea5d946d5a5596cf172b48"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e8a6bf43cea4347121ab21bb1ed8d7bef7e732e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/99aa698dec342a07125d733e39aab4394b3b7e05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aabc6596ffb377c4c9c8f335124b92ea282c9821"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b4c836d33ca888695b2f2665f948bc1b34fbd533"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b78f2b458f56a5a4d976c8e01c43dbf58d3ea2ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de5a4f0cba58625e88b7bebd88f780c8c0150997"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fbaffe8bccf148ece8ad67eb5d7aa852cabf59c8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:7903", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.17.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-19T00:00:00Z"}, {"advisory": "RHSA-2025:7903", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.17.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-19T00:00:00Z"}, {"advisory": "RHSA-2025:8248", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.70.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-05-28T00:00:00Z"}], "bugzilla": {"description": "kernel: net: ppp: Add bound checking for skb data on ppp_sync_txmung", "id": "2363332", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363332"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: ppp: Add bound checking for skb data on ppp_sync_txmung\nEnsure we have enough data in linear buffer from skb before accessing\ninitial bytes. This prevents potential out-of-bounds accesses\nwhen processing short packets.\nWhen ppp_sync_txmung receives an incoming package with an empty\npayload:\n(remote) gef\u27a4 p *(struct pppoe_hdr *) (skb->head + skb->network_header)\n$18 = {\ntype = 0x1,\nver = 0x1,\ncode = 0x0,\nsid = 0x2,\nlength = 0x0,\ntag = 0xffff8880371cdb96\n}\nfrom the skb struct (trimmed)\ntail = 0x16,\nend = 0x140,\nhead = 0xffff88803346f400 \"4\",\ndata = 0xffff88803346f416 \":\\377\",\ntruesize = 0x380,\nlen = 0x0,\ndata_len = 0x0,\nmac_len = 0xe,\nhdr_len = 0x0,\nit is not safe to access data[2].\n[pabeni@redhat.com: fixed subj typo]", "An out-of-bounds read vulnerability exists in the ppp_sync_txmunge() function in the Linux kernel's PPP subsystem. Insufficient bounds checking on incoming PPP packets may lead to a kernel crash if a packet with an empty or truncated payload is processed."], "mitigation": {"lang": "en:us", "value": "No mitigation is currently available that meets Red Hat Product Security\u2019s standards for usability, deployment, applicability, or stability."}, "name": "CVE-2025-37749", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37749\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37749\nhttps://lore.kernel.org/linux-cve-announce/2025050136-CVE-2025-37749-0f49@gregkh/T"], "statement": "This is rated Moderate because it involves an out-of-bounds read, not write, in the ppp_sync_txmunge() function, triggered by malformed PPP packets with insufficient linear data. While it can cause a kernel crash (DoS), exploitation is limited as PPP is not widely used or exposed in most modern systems. The affected path requires a crafted PPPoE packet and direct access to a PPP interface, reducing its overall impact and likelihood of exploitation.", "threat_severity": "Moderate"}

{}