{ "threat_severity" : "Moderate", "public_date" : "2025-09-17T00:00:00Z", "bugzilla" : { "description" : "kernel: skbuff: skb_segment, Call zero copy functions before using skbuff frags", "id" : "2396158", "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2396158" }, "cvss3" : { "cvss3_base_score" : "7.0", "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status" : "verified" }, "cwe" : "CWE-476", "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nskbuff: skb_segment, Call zero copy functions before using skbuff frags\nCommit bf5c25d60861 (\"skbuff: in skb_segment, call zerocopy functions\nonce per nskb\") added the call to zero copy functions in skb_segment().\nThe change introduced a bug in skb_segment() because skb_orphan_frags()\nmay possibly change the number of fragments or allocate new fragments\naltogether leaving nrfrags and frag to point to the old values. This can\ncause a panic with stacktrace like the one below.\n[ 193.894380] BUG: kernel NULL pointer dereference, address: 00000000000000bc\n[ 193.895273] CPU: 13 PID: 18164 Comm: vh-net-17428 Kdump: loaded Tainted: G O 5.15.123+ #26\n[ 193.903919] RIP: 0010:skb_segment+0xb0e/0x12f0\n[ 194.021892] Call Trace:\n[ 194.027422] \n[ 194.072861] tcp_gso_segment+0x107/0x540\n[ 194.082031] inet_gso_segment+0x15c/0x3d0\n[ 194.090783] skb_mac_gso_segment+0x9f/0x110\n[ 194.095016] __skb_gso_segment+0xc1/0x190\n[ 194.103131] netem_enqueue+0x290/0xb10 [sch_netem]\n[ 194.107071] dev_qdisc_enqueue+0x16/0x70\n[ 194.110884] __dev_queue_xmit+0x63b/0xb30\n[ 194.121670] bond_start_xmit+0x159/0x380 [bonding]\n[ 194.128506] dev_hard_start_xmit+0xc3/0x1e0\n[ 194.131787] __dev_queue_xmit+0x8a0/0xb30\n[ 194.138225] macvlan_start_xmit+0x4f/0x100 [macvlan]\n[ 194.141477] dev_hard_start_xmit+0xc3/0x1e0\n[ 194.144622] sch_direct_xmit+0xe3/0x280\n[ 194.147748] __dev_queue_xmit+0x54a/0xb30\n[ 194.154131] tap_get_user+0x2a8/0x9c0 [tap]\n[ 194.157358] tap_sendmsg+0x52/0x8e0 [tap]\n[ 194.167049] handle_tx_zerocopy+0x14e/0x4c0 [vhost_net]\n[ 194.173631] handle_tx+0xcd/0xe0 [vhost_net]\n[ 194.176959] vhost_worker+0x76/0xb0 [vhost]\n[ 194.183667] kthread+0x118/0x140\n[ 194.190358] ret_from_fork+0x1f/0x30\n[ 194.193670] \nIn this case calling skb_orphan_frags() updated nr_frags leaving nrfrags\nlocal variable in skb_segment() stale. This resulted in the code hitting\ni >= nrfrags prematurely and trying to move to next frag_skb using\nlist_skb pointer, which was NULL, and caused kernel panic. Move the call\nto zero copy functions before using frags and nr_frags." ], "affected_release" : [ { "product_name" : "Red Hat Enterprise Linux 8", "release_date" : "2024-05-22T00:00:00Z", "advisory" : "RHSA-2024:3138", "cpe" : "cpe:/o:redhat:enterprise_linux:8", "package" : "kernel-0:4.18.0-553.el8_10" }, { "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date" : "2025-12-17T00:00:00Z", "advisory" : "RHSA-2025:23445", "cpe" : "cpe:/o:redhat:rhel_aus:8.2", "package" : "kernel-0:4.18.0-193.178.1.el8_2" }, { "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date" : "2025-12-04T00:00:00Z", "advisory" : "RHSA-2025:22752", "cpe" : "cpe:/o:redhat:rhel_aus:8.4", "package" : "kernel-0:4.18.0-305.179.1.el8_4" }, { "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On", "release_date" : "2025-12-04T00:00:00Z", "advisory" : "RHSA-2025:22752", "cpe" : "cpe:/o:redhat:rhel_eus_long_life:8.4", "package" : "kernel-0:4.18.0-305.179.1.el8_4" }, { "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date" : "2025-11-25T00:00:00Z", "advisory" : "RHSA-2025:22006", "cpe" : "cpe:/o:redhat:rhel_aus:8.6", "package" : "kernel-0:4.18.0-372.170.1.el8_6" }, { "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date" : "2025-11-25T00:00:00Z", "advisory" : "RHSA-2025:22006", "cpe" : "cpe:/o:redhat:rhel_tus:8.6", "package" : "kernel-0:4.18.0-372.170.1.el8_6" }, { "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date" : "2025-11-25T00:00:00Z", "advisory" : "RHSA-2025:22006", "cpe" : "cpe:/o:redhat:rhel_e4s:8.6", "package" : "kernel-0:4.18.0-372.170.1.el8_6" }, { "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service", "release_date" : "2025-11-25T00:00:00Z", "advisory" : "RHSA-2025:22072", "cpe" : "cpe:/o:redhat:rhel_tus:8.8", "package" : "kernel-0:4.18.0-477.120.1.el8_8" }, { "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions", "release_date" : "2025-11-25T00:00:00Z", "advisory" : "RHSA-2025:22072", "cpe" : "cpe:/o:redhat:rhel_e4s:8.8", "package" : "kernel-0:4.18.0-477.120.1.el8_8" }, { "product_name" : "Red Hat Enterprise Linux 9", "release_date" : "2024-04-30T00:00:00Z", "advisory" : "RHSA-2024:2394", "cpe" : "cpe:/a:redhat:enterprise_linux:9", "package" : "kernel-0:5.14.0-427.13.1.el9_4" }, { "product_name" : "Red Hat Enterprise Linux 9", "release_date" : "2024-04-30T00:00:00Z", "advisory" : "RHSA-2024:2394", "cpe" : "cpe:/o:redhat:enterprise_linux:9", "package" : "kernel-0:5.14.0-427.13.1.el9_4" }, { "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date" : "2025-11-12T00:00:00Z", "advisory" : "RHSA-2025:21091", "cpe" : "cpe:/a:redhat:rhel_e4s:9.0", "package" : "kernel-0:5.14.0-70.153.1.el9_0" }, { "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date" : "2025-11-12T00:00:00Z", "advisory" : "RHSA-2025:21136", "cpe" : "cpe:/a:redhat:rhel_e4s:9.0::nfv", "package" : "kernel-rt-0:5.14.0-70.153.1.rt21.225.el9_0" }, { "product_name" : "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date" : "2024-10-16T00:00:00Z", "advisory" : "RHSA-2024:8157", "cpe" : "cpe:/a:redhat:rhel_eus:9.2", "package" : "kernel-0:5.14.0-284.88.1.el9_2" } ], "package_state" : [ { "product_name" : "Red Hat Enterprise Linux 10", "fix_state" : "Not affected", "package_name" : "kernel", "cpe" : "cpe:/o:redhat:enterprise_linux:10" }, { "product_name" : "Red Hat Enterprise Linux 6", "fix_state" : "Out of support scope", "package_name" : "kernel", "cpe" : "cpe:/o:redhat:enterprise_linux:6" }, { "product_name" : "Red Hat Enterprise Linux 7", "fix_state" : "Not affected", "package_name" : "kernel", "cpe" : "cpe:/o:redhat:enterprise_linux:7" }, { "product_name" : "Red Hat Enterprise Linux 7", "fix_state" : "Not affected", "package_name" : "kernel-rt", "cpe" : "cpe:/o:redhat:enterprise_linux:7" }, { "product_name" : "Red Hat Enterprise Linux 8", "fix_state" : "Affected", "package_name" : "kernel-rt", "cpe" : "cpe:/o:redhat:enterprise_linux:8" }, { "product_name" : "Red Hat Enterprise Linux 9", "fix_state" : "Affected", "package_name" : "kernel-rt", "cpe" : "cpe:/o:redhat:enterprise_linux:9" } ], "references" : [ "https://www.cve.org/CVERecord?id=CVE-2023-53354\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53354\nhttps://lore.kernel.org/linux-cve-announce/2025091721-CVE-2023-53354-771f@gregkh/T" ], "name" : "CVE-2023-53354", "csaw" : false }