{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99116","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.392Z","datePublished":"2026-10-28T10:34:33.109Z","dateUpdated":"2026-10-31T12:43:13.361Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-31T12:43:13.361Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: psp: do not inherit the Rx association on clone\n\nsk->psp_assoc sits past sk_dontcopy_end, so sock_copy() copies it into\nevery socket accepted from a listener without taking a reference, while\ninet_sock_destruct() puts for every inet socket. psp_twsk_init() does\nrefcount_inc() for the timewait socket, so a child closing through\nTIME_WAIT cancels its own put and leaves the association with one\nreference and N timewait sockets holding the same pointer. Closing the\nlistener frees it, and the timewait timers then put freed memory.\n\nRejecting the association on a listening socket is not sufficient: a socket\ncan acquire one while established and then be turned back into a listener,\nbecause tcp_disconnect() leaves sk->psp_assoc in place.\n\n  BUG: KASAN: slab-use-after-free in psp_twsk_assoc_free+0x6f/0xf0\n  Write of size 4 at addr ffff888110f9255c by task swapper/7/0\n   psp_twsk_assoc_free+0x6f/0xf0\n   inet_twsk_put+0xda/0x1b0\n   call_timer_fn+0x53/0x2e0\n   __run_timers+0x764/0xa80\n  Freed by task 99:\n   kfree+0x1a7/0x500\n   process_one_work+0x7ec/0x1100\n\nAn association carries a per-connection SPI and key, so a child must not\ninherit the parent's. Clear it on clone."}],"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 - A local process uses PSP_CMD_RX_ASSOC to reach psp_nl_rx_assoc_doit()->psp_sock_assoc_set_rx() on its listener, then completes a loopback handshake through tcp_check_req()->tcp_v4_syn_recv_sock()->tcp_create_openreq_child()->inet_csk_clone_lock()->sk_clone(). No remote message can install the listener's psp_assoc.\nAC:L - The same process controls both endpoints: it closes accepted children through tcp_fin()->tcp_time_wait()->psp_twsk_init(), closes the listener, and waits for the TIME_WAIT timer. This deterministic sequence requires no race or condition outside its control.\nPR:L - PSP_CMD_RX_ASSOC lacks GENL_ADMIN_PERM; psp_assoc_device_get_locked() only applies sockfd_lookup() to the caller's TCP fd, while psp_dev_check_access() checks network-namespace visibility rather than capabilities. An ordinary user in the device's netns suffices.\nUI:N - The attacker performs PSP association, loopback connection, child teardown, and listener closure using their own descriptors; no victim must perform any action.\nS:U - The stale pointer from sk_clone() corrupts host-kernel heap memory in psp_twsk_assoc_free(); it crosses no VM, IOMMU, or other security-authority boundary.\nC:H - The delayed psp_assoc_put() operates on reclaimed psp_assoc storage; a replacement with refcnt equal to 1 causes call_rcu() and workqueue processing on that replacement. This exploitable lifetime confusion can provide kernel execution and arbitrary kernel-memory reads.\nI:H - psp_twsk_assoc_free()->psp_assoc_put() decrements four bytes at the freed psp_assoc.refcnt; if it reaches zero, call_rcu(&pas->rcu, ...) and subsequent work initialization also modify reclaimed storage, providing exploitable heap corruption and control-flow potential.\nA:H - The demonstrated TIME_WAIT timer path produces a slab-use-after-free in psp_twsk_assoc_free(); repeated stale timers can corrupt reclaimed objects and cause a kernel oops or panic."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/sock.c"],"versions":[{"version":"6b46ca260e2290e3453d1355ab5b6d283d73d780","lessThan":"a9f14ea73e82db743f0acf4219f499d594589288","status":"affected","versionType":"git"},{"version":"6b46ca260e2290e3453d1355ab5b6d283d73d780","lessThan":"c962695467d3ab9738a6508279827ec33a7d2bdf","status":"affected","versionType":"git"},{"version":"6b46ca260e2290e3453d1355ab5b6d283d73d780","lessThan":"1d2929d0850fff683b8aff051275945e65f082c8","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/core/sock.c"],"versions":[{"version":"6.18","status":"affected"},{"version":"0","lessThan":"6.18","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","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":"6.18","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a9f14ea73e82db743f0acf4219f499d594589288"},{"url":"https://git.kernel.org/stable/c/c962695467d3ab9738a6508279827ec33a7d2bdf"},{"url":"https://git.kernel.org/stable/c/1d2929d0850fff683b8aff051275945e65f082c8"}],"title":"net: psp: do not inherit the Rx association on clone","x_generator":{"engine":"bippy-1.2.0"}}}}