{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-21760", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.761Z", "datePublished": "2025-02-27T02:18:13.496Z", "dateUpdated": "2026-08-05T11:54:13.122Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:54:13.122Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nndisc: extend RCU protection in ndisc_send_skb()\n\nndisc_send_skb() can be called without RTNL or RCU held.\n\nAcquire rcu_read_lock() earlier, so that we can use dev_net_rcu()\nand avoid a potential UAF." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - `ndisc_send_skb()` sits on the IPv6 neighbour-discovery transmit path, which is driven by ordinary received network traffic — a remote packet that requires a next-hop resolve causes `neigh_probe()`→`ndisc_solicit()`→`ndisc_send_ns()`→`ndisc_send_skb( )`, and inbound NS/RS/forwarded packets also reach it via `ndisc_send_na()`/`ndisc_send_redirect()`. This matches the AV:N assessment of its direct IPv4 counterpart `arp_xmit()` in the same series.\nAC:H - The stale `struct net` only becomes a use-after-free if the device's netns is concurrently dismantled (`dev_change_net_namespace()` from `default_device_exit_batch()` followed by `net_free()`), and a remote attacker can neither trigger nor time netns teardown. Hitting the window therefore depends on host-side container/netns churn outside the attacker's control.\nPR:N - The ND transmit path is entered from unauthenticated received packets and from routing-driven neighbour probing; no credentials, account, or capability on the target host are needed to drive it.\nUI:N - Neighbour solicitation, router probing and NA replies are automatic kernel behaviours triggered by packet arrival and timer/workqueue expiry; no victim action is involved.\nS:U - The freed `struct net`, its `ndisc_sk`, MIB counters and netfilter hook arrays all live in the kernel's own security authority, so impact stays within the kernel — no VM, IOMMU or sandbox boundary is crossed.\nC:H - `sk` is loaded from the freed `net`, and `READ_ONCE(inet6_sk(sk)->hop_limit)` is copied into a transmitted ICMPv6 header, so a reclaimed-slab spray yields a read of attacker-chosen kernel memory exfiltrated onto the wire; more generally a UAF of `struct net` gives an arbitrary-read primitive.\nI:H - `IP6_INC_STATS`/`ICMP6_INC_STATS` increment through a per-cpu pointer read from freed memory, and `NF_HOOK()` dispatches indirect calls through `net->nf.hooks_ipv6[]` loaded from the freed object, giving both a write primitive and a plausible control-flow-hijack path.\nA:H - Dereferencing a freed `struct net` and the garbage `ndisc_sk` pointer derived from it reliably produces an oops or panic, and the corrupted netfilter hook walk can take the whole kernel down." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/ndisc.c" ], "versions": [ { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "4d576202b90b1b95a7c428a80b536f91b8201bcc", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "e24d225e4cb8cf108bde00b76594499b98f0a74d", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "ae38982f521621c216fc2f5182cd091f4734641d", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "789230e5a8c1097301afc802e242c79bc8835c67", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "04e05112f10354ffc3bb6cc796d553bab161594c", "status": "affected", "versionType": "git" }, { "version": "1762f7e88eb34f653b4a915be99a102e347dd45e", "lessThan": "ed6ae1f325d3c43966ec1b62ac1459e2b8e45640", "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/ipv6/ndisc.c" ], "versions": [ { "version": "2.6.26", "status": "affected" }, { "version": "0", "lessThan": "2.6.26", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.291", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.235", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.179", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.129", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.79", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.16", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13.4", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14", "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": "2.6.26", "versionEndExcluding": "5.4.291" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.10.235" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.179" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.129" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.79" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.13.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.14" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1" }, { "url": "https://git.kernel.org/stable/c/4d576202b90b1b95a7c428a80b536f91b8201bcc" }, { "url": "https://git.kernel.org/stable/c/e24d225e4cb8cf108bde00b76594499b98f0a74d" }, { "url": "https://git.kernel.org/stable/c/a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d" }, { "url": "https://git.kernel.org/stable/c/ae38982f521621c216fc2f5182cd091f4734641d" }, { "url": "https://git.kernel.org/stable/c/789230e5a8c1097301afc802e242c79bc8835c67" }, { "url": "https://git.kernel.org/stable/c/04e05112f10354ffc3bb6cc796d553bab161594c" }, { "url": "https://git.kernel.org/stable/c/ed6ae1f325d3c43966ec1b62ac1459e2b8e45640" } ], "title": "ndisc: extend RCU protection in ndisc_send_skb()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2025-21760", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T17:57:40.416234Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:02:27.327Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:37:05.973Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:40:00.582Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "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" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "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-019113.html" } ] } ] } }