CVE-2026-64188 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576
https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025
https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3
https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71
https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b
https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135
https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658
https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink() rmnet_dellink() removes the endpoint from the hash table with hlist_del_init_rcu() and then immediately frees it with kfree(). However, RCU readers on the receive path (rmnet_rx_handler -> __rmnet_map_ingress_handler) may still hold a reference to the endpoint and dereference ep->egress_dev after the memory has been freed. The endpoint is a kmalloc-32 object, and the stale read at offset 8 corresponds to the egress_dev pointer. BUG: unable to handle page fault for address: ffffffffde942eef Oops: 0002 [#1] SMP NOPTI CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27) Call Trace: <TASK> __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101) rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096) __netif_receive_skb_one_core (net/core/dev.c:6208) netif_receive_skb (net/core/dev.c:6467) tun_get_user (drivers/net/tun.c:1955) tun_chr_write_iter (drivers/net/tun.c:2003) vfs_write (fs/read_write.c:688) ksys_write (fs/read_write.c:740) </TASK> Add an rcu_head field to struct rmnet_endpoint and replace kfree() with kfree_rcu() so the endpoint memory remains valid through the RCU grace period. Also remove the rmnet_vnd_dellink() call and inline only the nr_rmnet_devs decrement, since rmnet_vnd_dellink() would set ep->egress_dev to NULL during the grace period, creating a data race with lockless readers.
Title		net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/1078ae8175777e80c9637996fb4a46c55f0ce576 https://git.kernel.org/stable/c/310b93246bfec7d4452507e0c15477377ed9f025 https://git.kernel.org/stable/c/41e06fcc5df0774d212e70c5b503fc769492bce3 https://git.kernel.org/stable/c/8b17adf6d4fb6bf61fa4c3f58366a7c082799a71 https://git.kernel.org/stable/c/9918698cf3aee4032e12bb42fd5a951dc465339b https://git.kernel.org/stable/c/c4e676c3505c5058922dc1a6f1ded795f6758135 https://git.kernel.org/stable/c/d00c953a8f69921f484b629801766da68f27f658 https://git.kernel.org/stable/c/f193e38cb257d033060b63f1cfd94af076b3a2ab

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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."}], "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": 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