CVE-2026-99116 (GCVE-0-2026-99116)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-31 12:43
VLAI
Title
net: psp: do not inherit the Rx association on clone
Summary
In the Linux kernel, the following vulnerability has been resolved: net: psp: do not inherit the Rx association on clone sk->psp_assoc sits past sk_dontcopy_end, so sock_copy() copies it into every socket accepted from a listener without taking a reference, while inet_sock_destruct() puts for every inet socket. psp_twsk_init() does refcount_inc() for the timewait socket, so a child closing through TIME_WAIT cancels its own put and leaves the association with one reference and N timewait sockets holding the same pointer. Closing the listener frees it, and the timewait timers then put freed memory. Rejecting the association on a listening socket is not sufficient: a socket can acquire one while established and then be turned back into a listener, because tcp_disconnect() leaves sk->psp_assoc in place. BUG: KASAN: slab-use-after-free in psp_twsk_assoc_free+0x6f/0xf0 Write of size 4 at addr ffff888110f9255c by task swapper/7/0 psp_twsk_assoc_free+0x6f/0xf0 inet_twsk_put+0xda/0x1b0 call_timer_fn+0x53/0x2e0 __run_timers+0x764/0xa80 Freed by task 99: kfree+0x1a7/0x500 process_one_work+0x7ec/0x1100 An association carries a per-connection SPI and key, so a child must not inherit the parent's. Clear it on clone.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6643 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6b46ca260e2290e3453d1355ab5b6d283d73d780 , < a9f14ea73e82db743f0acf4219f499d594589288 (git)
Affected: 6b46ca260e2290e3453d1355ab5b6d283d73d780 , < c962695467d3ab9738a6508279827ec33a7d2bdf (git)
Affected: 6b46ca260e2290e3453d1355ab5b6d283d73d780 , < 1d2929d0850fff683b8aff051275945e65f082c8 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: psp: do not inherit the Rx association on clone\n\nsk-\u003epsp_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-\u003epsp_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\u0027s. Clear it on clone."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:L - A local process uses PSP_CMD_RX_ASSOC to reach psp_nl_rx_assoc_doit()-\u003epsp_sock_assoc_set_rx() on its listener, then completes a loopback handshake through tcp_check_req()-\u003etcp_v4_syn_recv_sock()-\u003etcp_create_openreq_child()-\u003einet_csk_clone_lock()-\u003esk_clone(). No remote message can install the listener\u0027s psp_assoc.\nAC:L - The same process controls both endpoints: it closes accepted children through tcp_fin()-\u003etcp_time_wait()-\u003epsp_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\u0027s TCP fd, while psp_dev_check_access() checks network-namespace visibility rather than capabilities. An ordinary user in the device\u0027s 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()-\u003epsp_assoc_put() decrements four bytes at the freed psp_assoc.refcnt; if it reaches zero, call_rcu(\u0026pas-\u003ercu, ...) 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."
            }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1d2929d0850fff683b8aff051275945e65f082c8"
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      "title": "net: psp: do not inherit the Rx association on clone",
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    "datePublished": "2026-10-28T10:34:33.109Z",
    "dateReserved": "2026-09-25T10:25:14.392Z",
    "dateUpdated": "2026-10-31T12:43:13.361Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: psp: do not inherit the Rx association on clone\n\nsk-\u003epsp_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-\u003epsp_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\u0027s. Clear it on clone."
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        "lastModified": "2026-10-31T13:17:56.150",
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                "userInteraction": "NONE",
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        "vulnStatus": "Received"
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    "redhat_vex": {
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      "cve": "CVE-2026-99116",
      "id": "CVE-2026-99116",
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      "product_status:known_affected": "15",
      "product_status:known_not_affected": "188",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: psp: do not inherit the Rx association on clone",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99116.json",
      "version": "3"
    },
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      "current_release_date": "2026-11-04T16:00:45Z",
      "cve": "CVE-2026-99116",
      "id": "CVE-2026-99116",
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      "product_status:known_not_affected": "348",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99116",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99116.json",
      "version": "4"
    }
  }
}



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