CVE-2025-39872

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A remote peer on the HSR ring cannot induce multicast address changes or HSR port reconfiguration, so this is not network-reachable.\nAC:L - The attacker fully controls the traversal side of the race by looping `IP_ADD_MEMBERSHIP`/`IP_DROP_MEMBERSHIP` to repeatedly queue `emac_ndo_set_rx_mode_work`, and the walk runs in preemptible process context with no RCU or RTNL held, so no tight timing window must be won \u2014 only overlap with a port-list mutation, which can be retried indefinitely.\nPR:L - Triggering the vulnerable `hsr_get_port_ndev()` traversal requires only an ordinary unprivileged UDP socket performing a multicast group join on the HSR interface; no capability check exists anywhere on that path. Widening the race window via HSR port reconfiguration needs only CAP_NET_ADMIN, which per kernel CNA guidance is scored as Low.\nUI:N - The entire sequence is driven by the attacker's own socket operations against an already-configured HSR-offload interface. No victim action is needed.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The unlocked RCU walk dereferences a freed `hsr_port` and the returned `net_device` is used without a reference, and `netdev_priv()` on that freed device is read as a `prueth_emac` \u2014 a use-after-free read whose contents the attacker can groom via heap spray, yielding kernel memory disclosure and pointer leakage.\nI:H - `icssg_fdb_setup()` performs `++(emac->prueth->icssg_hwcmdseq)` \u2014 a pointer loaded out of the freed object and then written through \u2014 plus further writes into PRU shared memory at addresses derived from freed data, giving a controllable write primitive suitable for control-flow hijacking after heap reuse.\nA:H - Following a `kfree_rcu()`-freed list node and dereferencing a freed `net_device` reliably produces an oops/panic (and slab corruption) even when not exploited further, and the attacker can retrigger it repeatedly on an industrial redundancy device."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/ti/icssg/icssg_prueth.c", "net/hsr/hsr_device.c"], "versions": [{"version": "ef964411c8ca775967355d855abc56aeaca3c867", "lessThan": "9433ba79c2ec3ec7c9a711748701549339c3438c", "status": "affected", "versionType": "git"}, {"version": "9c10dd8eed74de9e8adeb820939f8745cd566d4a", "lessThan": "68a6729afd3e8e9a2a32538642ce92b96ccf9b1d", "status": "affected", "versionType": "git"}, {"version": "9c10dd8eed74de9e8adeb820939f8745cd566d4a", "lessThan": "847748fc66d08a89135a74e29362a66ba4e3ab15", "status": "affected", "versionType": "git"}, {"version": "6.12.63", "lessThan": "6.12.64", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/ti/icssg/icssg_prueth.c", "net/hsr/hsr_device.c"], "versions": [{"version": "6.14", "status": "affected"}, {"version": "0", "lessThan": "6.14", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.64", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.8", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "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": "6.12.63", "versionEndExcluding": "6.12.64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.16.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/9433ba79c2ec3ec7c9a711748701549339c3438c"}, {"url": "https://git.kernel.org/stable/c/68a6729afd3e8e9a2a32538642ce92b96ccf9b1d"}, {"url": "https://git.kernel.org/stable/c/847748fc66d08a89135a74e29362a66ba4e3ab15"}], "title": "hsr: hold rcu and dev lock for hsr_get_port_ndev", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/ti/icssg/icssg_prueth.c", "net/hsr/hsr_device.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "9433ba79c2ec3ec7c9a711748701549339c3438c", "status": "affected", "version": "ef964411c8ca775967355d855abc56aeaca3c867", "versionType": "git"}, {"lessThan": "68a6729afd3e8e9a2a32538642ce92b96ccf9b1d", "status": "affected", "version": "9c10dd8eed74de9e8adeb820939f8745cd566d4a", "versionType": "git"}, {"lessThan": "847748fc66d08a89135a74e29362a66ba4e3ab15", "status": "affected", "version": "9c10dd8eed74de9e8adeb820939f8745cd566d4a", "versionType": "git"}, {"lessThan": "6.12.64", "status": "affected", "version": "6.12.63", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/ti/icssg/icssg_prueth.c", "net/hsr/hsr_device.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.64", "versionType": "semver"}, {"lessThanOrEqual": "6.16.*", "status": "unaffected", "version": "6.16.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F6C3723D-6863-4401-AC08-FEB7AB987047", "versionEndExcluding": "6.16.8", "versionStartIncluding": "6.14", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*", "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*", "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*", "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*", "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*", "matchCriteriaId": "47E4C5C0-079F-4838-971B-8C503D48FCC2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhsr: hold rcu and dev lock for hsr_get_port_ndev\n\nhsr_get_port_ndev calls hsr_for_each_port, which need to hold rcu lock.\nOn the other hand, before return the port device, we need to hold the\ndevice reference to avoid UaF in the caller function."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nhsr: mantener los bloqueos rcu y dev para hsr_get_port_ndev\n\nhsr_get_port_ndev llama a hsr_for_each_port, que necesita mantener el bloqueo rcu.\nPor otro lado, antes de devolver el dispositivo de puerto, necesitamos mantener la referencia del dispositivo para evitar UaF en la funci\u00f3n llamadora."}], "id": "CVE-2025-39872", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-09-23T06:15:46.533", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/68a6729afd3e8e9a2a32538642ce92b96ccf9b1d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/847748fc66d08a89135a74e29362a66ba4e3ab15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9433ba79c2ec3ec7c9a711748701549339c3438c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: hsr: hold rcu and dev lock for hsr_get_port_ndev", "id": "2397554", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2397554"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-39872", "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": "Not affected", "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": "2025-09-23T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39872\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39872\nhttps://lore.kernel.org/linux-cve-announce/2025092300-CVE-2025-39872-5102@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-23T16:03:15.711683+00:00", "updated": "2025-09-23T16:03:15.711764+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}