CVE-2026-64188

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However,\nRCU readers on the receive path (rmnet_rx_handler ->\n__rmnet_map_ingress_handler) may still hold a reference to the endpoint and\ndereference ep->egress_dev after the memory has been freed. The endpoint is\na kmalloc-32 object, and the stale read at offset 8 corresponds to the\negress_dev pointer.\n\n BUG: unable to handle page fault for address: ffffffffde942eef\n Oops: 0002 [#1] SMP NOPTI\n CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY\n RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27)\n Call Trace:\n <TASK>\n __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101)\n rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235)\n __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096)\n __netif_receive_skb_one_core (net/core/dev.c:6208)\n netif_receive_skb (net/core/dev.c:6467)\n tun_get_user (drivers/net/tun.c:1955)\n tun_chr_write_iter (drivers/net/tun.c:2003)\n vfs_write (fs/read_write.c:688)\n ksys_write (fs/read_write.c:740)\n </TASK>\n\nAdd an rcu_head field to struct rmnet_endpoint and replace kfree() with\nkfree_rcu() so the endpoint memory remains valid through the RCU grace\nperiod. Also remove the rmnet_vnd_dellink() call and inline only the\nnr_rmnet_devs decrement, since rmnet_vnd_dellink() would set\nep->egress_dev to NULL during the grace period, creating a data race\nwith lockless readers."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The complete exploit path is local: attacker-written frames enter through TUN while RTM_DELLINK over NETLINK_ROUTE invokes rmnet_dellink(); remote traffic alone cannot perform the required endpoint deletion.\nAC:L - The attacker controls both sides of the race by concurrently injecting crafted MAP frames and deleting or recreating the RMNET link, allowing repeated attempts without an uncontrollable condition.\nPR:L - Deletion requires CAP_NET_ADMIN in the route socket's network namespace, which an unprivileged user can obtain through a private user and network namespace to create TUN and RMNET devices.\nUI:N - No separate victim action is required because the attacker directly performs link setup, packet injection, and deletion.\nS:U - Exploitation compromises the kernel within the same security authority and does not cross a VM, IOMMU, or comparable scope boundary.\nC:H - The freed kmalloc-32 endpoint can be reclaimed with attacker-influenced contents, making the stale egress_dev pointer usable for forged-object dereferences and access to sensitive kernel memory.\nI:H - The corrupted egress_dev pointer reaches rmnet_vnd_rx_fixup, where derived per-CPU statistics pointers are written, providing a plausible path to arbitrary memory corruption and control-flow hijacking.\nA:H - The demonstrated race causes a page fault and kernel Oops in rmnet_vnd_rx_fixup, and it can be triggered repeatedly to crash the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c", "drivers/net/ethernet/qualcomm/rmnet/rmnet_config.h"], "versions": [{"version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "c4e676c3505c5058922dc1a6f1ded795f6758135", "status": "affected", "versionType": "git"}, {"version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "9918698cf3aee4032e12bb42fd5a951dc465339b", "status": "affected", "versionType": "git"}, {"version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "310b93246bfec7d4452507e0c15477377ed9f025", "status": "affected", "versionType": "git"}, {"version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "1078ae8175777e80c9637996fb4a46c55f0ce576", "status": "affected", "versionType": "git"}, {"version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "41e06fcc5df0774d212e70c5b503fc769492bce3", "status": "affected", "versionType": "git"}, 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{}

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"0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.260", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.211", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.177", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.144", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.95", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.37", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.14", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": 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"E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()\n\nrmnet_dellink() removes the endpoint from the hash table with\nhlist_del_init_rcu() and then immediately frees it with kfree(). However,\nRCU readers on the receive path (rmnet_rx_handler ->\n__rmnet_map_ingress_handler) may still hold a reference to the endpoint and\ndereference ep->egress_dev after the memory has been freed. The endpoint is\na kmalloc-32 object, and the stale read at offset 8 corresponds to the\negress_dev pointer.\n\n BUG: unable to handle page fault for address: ffffffffde942eef\n Oops: 0002 [#1] SMP NOPTI\n CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY\n RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27)\n Call Trace:\n <TASK>\n __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101)\n rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235)\n __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096)\n __netif_receive_skb_one_core (net/core/dev.c:6208)\n netif_receive_skb (net/core/dev.c:6467)\n tun_get_user (drivers/net/tun.c:1955)\n tun_chr_write_iter (drivers/net/tun.c:2003)\n vfs_write (fs/read_write.c:688)\n ksys_write (fs/read_write.c:740)\n </TASK>\n\nAdd an rcu_head field to struct rmnet_endpoint and replace kfree() with\nkfree_rcu() so the endpoint memory remains valid through the RCU grace\nperiod. Also remove the rmnet_vnd_dellink() call and inline only the\nnr_rmnet_devs decrement, since rmnet_vnd_dellink() would set\nep->egress_dev to NULL during the grace period, creating a data race\nwith lockless readers."}], "id": "CVE-2026-64188", "lastModified": "2026-08-11T19:08:45.213", "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"}]}, "published": "2026-07-20T17:18:21.853", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()", "id": "2502875", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502875"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Qualcomm rmnet driver within the Linux kernel. The `rmnet_dellink()` function improperly frees an endpoint while Read-Copy-Update (RCU) readers may still hold a reference to it. This use-after-free vulnerability allows a local attacker to trigger a system crash, resulting in a denial of service (DoS)."], "name": "CVE-2026-64188", "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"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64188\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64188\nhttps://lore.kernel.org/linux-cve-announce/2026072051-CVE-2026-64188-ce95@gregkh/T"]}

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