{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64188", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.040Z", "datePublished": "2026-07-20T16:27:47.216Z", "dateUpdated": "2026-08-05T12:39:57.703Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:57.703Z" }, "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 \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 \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" }, { "version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "8b17adf6d4fb6bf61fa4c3f58366a7c082799a71", "status": "affected", "versionType": "git" }, { "version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "f193e38cb257d033060b63f1cfd94af076b3a2ab", "status": "affected", "versionType": "git" }, { "version": "ceed73a2cf4aff2921802aa3d21d45280677547d", "lessThan": "d00c953a8f69921f484b629801766da68f27f658", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "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": "4.14", "status": "affected" }, { "version": "0", "lessThan": "4.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.260", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.211", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.177", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.144", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.95", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.37", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.14", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "4.14", "versionEndExcluding": "5.10.260" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "5.15.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.1.177" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.6.144" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.12.95" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "6.18.37" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.0.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135" }, { "url": "https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b" }, { "url": "https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025" }, { "url": "https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576" }, { "url": "https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3" }, { "url": "https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71" }, { "url": "https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab" }, { "url": "https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658" } ], "title": "net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()", "x_generator": { "engine": "bippy-1.2.0" } } } }