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{
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          "product": "Linux",
          "programFiles": [
            "net/core/skbuff.c"
          ],
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "7.3.2",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.4-rc1",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker in skb_zerocopy()\n\nskb_zerocopy() moves frag descriptors from @from into @to and takes a\nreference on each frag, but it does not copy skb_shinfo(from)-\u003eflags into\nskb_shinfo(to)-\u003eflags.  A destination skb holding the same page-cache\nbacked frags as the source therefore reports skb_has_shared_frag() as\nfalse.\n\nThat breaks the invariant relied on by later in-place writers.  ESP input\nchecks skb_has_shared_frag() before deciding whether an uncloned\nnonlinear skb can skip skb_cow_data(); with the marker lost, an skb that\nskb_zerocopy() built for nfnetlink_queue or for an openvswitch upcall is\ndecrypted in place, letting an unprivileged user write into the page\ncache of a root-owned read-only file.\n\nPropagate SKBFL_SHARED_FRAG when frag descriptors are copied, as done for\nthe other frag-transfer helpers."
        }
      ],
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        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/1c623e3cbf43f12dd4a72712079bfa247a9b8ba3"
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          "url": "https://git.kernel.org/stable/c/d7d6ff98d5d1b400f02211f962ac32cc0020aeab"
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        },
        {
          "url": "https://git.kernel.org/stable/c/79dc34beb1fdb3da79753e51e15c68591a2561fe"
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      ],
      "title": "net: skbuff: propagate shared-frag marker in skb_zerocopy()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99284",
    "datePublished": "2026-11-07T20:40:33.661Z",
    "dateReserved": "2026-09-25T10:25:14.405Z",
    "dateUpdated": "2026-11-07T20:40:33.661Z",
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          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_conntrack_proto_tcp.c"
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          "vendor": "Linux",
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "status": "unaffected",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: tcp: use UNACK timeout for non-closing RST packets\n\nCommit be0502a3f2e9 (\"netfilter: conntrack: tcp: only close if RST\nmatches exact sequence\") keeps an established conntrack entry in\nESTABLISHED when an in-window RST does not match the expected sequence\nnumber exactly, so the endpoint can validate the RST with a challenge\nACK.\n\nThe timeout selection nevertheless uses the CLOSE timeout for every RST\npacket.  The bug is that timeout selection is based on the packet type,\nnot on the state transition result: even when RST validation keeps\nnew_state in ESTABLISHED, the timeout is still forced to\nTCP_CONNTRACK_CLOSE.\n\nLinux TCP independently rate limits challenge ACKs per socket.  A second\nnon-exact RST can therefore arrive after the first challenge ACK has\nrestored the timeout but before the rate limit expires.  The second RST\nlowers the timeout to 10 seconds again while the endpoint suppresses the\nsecond challenge ACK, allowing the conntrack entry to expire while both\nTCP endpoints remain established.\n\nUsing the ESTABLISHED timeout for such RSTs would avoid this short\nexpiration window, but it could also retain stale entries for the\nfive-day default because conntrack cannot reliably match the endpoint\u0027s\nexact TCP state.\n\nUse the UNACK timeout for RST packets that leave the conntrack entry in\nTCP_CONNTRACK_ESTABLISHED.  Exact-match RSTs and accepted RST packet\ntrains still fall through to timeouts[new_state], which preserves the\nCLOSE timeout when conntrack accepts the RST as closing the flow.\n\nThis avoids the aggressive 10-second expiration window for non-exact\nRSTs while preserving the short timeout for RSTs that conntrack accepts\nas closing the flow."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-07T20:14:11.433Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/bf80e6802273a900311b44e47c9b1a59c6d2473c"
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      ],
      "title": "netfilter: conntrack: tcp: use UNACK timeout for non-closing RST packets",
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    "cveId": "CVE-2026-99283",
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.33"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_teql: fix use-after-free on lower qdisc drop\n\nThe issue: teql_master_xmit() tests the slave\u0027s ndo_start_xmit() return\nvalue against NETDEV_TX_OK alone. A slave that consumes the skb but\nreturns an error code (rc \u003c NET_XMIT_MASK, e.g. NET_XMIT_DROP) is treated\nas if the skb were still owned, so the loop restores skb-\u003edev and calls\n__skb_pull() on it. A VLAN slave returns the result of dev_queue_xmit()\nfrom its ndo_start_xmit() (propagated since cbbef5e18307), and when the\nlower qdisc drops the packet that value is NET_XMIT_DROP after the skb\nhas been freed, giving a use-after-free in teql_master_xmit().\n\nThe Fix: test for consumption with dev_xmit_complete(), which accepts\nNETDEV_TX_OK and every rc \u003c NET_XMIT_MASK, matching other callers that\nneed to distinguish consumed results from busy. Only NETDEV_TX_OK keeps\nthe packet counted in tx_packets/tx_bytes and advances the slave; a\nconsumed result that is neither a success nor NET_XMIT_CN ends the\nattempt and is charged to tx_dropped, so lower-qdisc drops are no longer\nreported as good transmits. NET_XMIT_CN is counted like success because\nit can accompany acceptance of the current packet: pfifo_head_drop drops\nthe old head, enqueues the current skb and returns NET_XMIT_CN.\n\nConditions to recreate the bug:\nWith CONFIG_NET_SCH_TEQL,\nCONFIG_VLAN_8021Q and CONFIG_DUMMY enabled, add lkrdummy0 (dummy) and\nlkrvlan0 (VLAN id 37 on lkrdummy0); set a pfifo limit 0 root on lkrdummy0\nand a teql0 root on lkrvlan0; bring teql0 up with an address and send one\nUDP packet to it. The VLAN xmit returns NET_XMIT_DROP from the lower\nqdisc while holding a freed skb."
        }
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        {
          "url": "https://git.kernel.org/stable/c/782d6bb8f9b8e9d8591181662222bf74cd3ecf79"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntun: Require CAP_NET_ADMIN to attach to an ownerless device\n\nTwenty years ago I made creating a tuntap device require CAP_NET_ADMIN\nin commit ca6bb5d7ab22 (\"[NET]: Require CAP_NET_ADMIN to create tuntap\ndevices.\")\n\nThe idea was to allow the permissions on /dev/net/tun to be relaxed to\n0666 and thus allow owners of tun devices assigned with TUNSETOWNER to\nactually open it and get at their devices.\n\nWhat we missed at the time was that persistent devices with *no* owner\nwere already essentially world-consumable, and anyone who could open\nthe device node could also attach to those.\n\nEven then, using persistent devices with no explicitly set owner \u2014 on\nthe (false) presumption that CAP_NET_ADMIN would be required to open\nthem \u2014 wasn\u0027t an egregious userspace bug. There are cases where it does\nmake sense to separate the creation/configuration of the netdevice, from\nthe process which shovels packets into it.\n\nSince then, TUNSETGROUP was added a year later in commit 8c644623fe7e\n(\"[NET]: Allow group ownership of TUN/TAP devices.\"). Its commit message\nnoted that if both uid and gid are set, both have to match (in itself a\nbizarre choice) \u2014 but still not that with *neither* set, no permission\nat all was required.\n\nThen in 2012 commit c8d68e6be1c3 (\"tuntap: multiqueue support\") allowed\nnew queues to be attached to a device from the moment of its creation,\nwith no way for userspace to close the race between creation and a\nsubsequent TUNSET{OWNER,GROUP}.\n\nIn 2024, commit 3ca459eaba1bf (\"tun: fix group permission check\") tried\nto fix things to be saner: only require the user *or* the group to\nmatch, in line with standard POSIX permissions, and require\nCAP_NET_ADMIN if neither the user nor group authorised the access\n(although it put the CAP_NET_ADMIN check first, and would wrongly have\nreported the capability as having been used even when it was not).\n\nThat fix was reverted in commit a70c7b3cbc06 (\"tun: revert fix group\npermission check\") due to allegedly causing a regression in an selinux\ntest suite which *expected* the attachment to succeed when authorised\nby none of user, group, nor CAP_NET_ADMIN:\nhttps://lore.kernel.org/netdev/CAFqZXNtkCBT4f+PwyVRmQGoT3p1eVa01fCG_aNtpt6dakXncUg@mail.gmail.com/\n\nWe should not break UAPI. But we don\u0027t have to consider an selinux test\ncase which deliberately exercises a security flaw to be UAPI worth\npreserving either. To which end, I have fixed it in selinux-testsuite\ncommit b2f894f0016b (\"tests/tun_tap: set an owner on the device for the\nrelabel tests\").\n\nSo: fix the lack of CAP_NET_ADMIN check on devices which *haven\u0027t* been\nassigned an owner or group, while leaving the weird tun ownership model\nas it was (user *and* group have to match, if both are set). If someone\nstill wants to fix the latter (which wasn\u0027t actually the reason the\nprevious attempt was reverted), they can do it under separate cover.\n\nPermit attaching to an existing device only if an owner and/or group was\nset and the caller matches all that were set, or if the caller has\nCAP_NET_ADMIN. The only behavioural change is that a device with no\nowner or group now requires CAP_NET_ADMIN to attach \u2014 precisely the\nloophole we want to close.\n\nAnd put the CAP_NET_ADMIN check in the right place this time."
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