275 lines
17 KiB
JSON
275 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-26865",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-19T14:20:24.184Z",
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"datePublished": "2024-04-17T10:27:27.522Z",
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"dateUpdated": "2026-08-05T11:27:53.524Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:27:53.524Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrds: tcp: Fix use-after-free of net in reqsk_timer_handler().\n\nsyzkaller reported a warning of netns tracker [0] followed by KASAN\nsplat [1] and another ref tracker warning [1].\n\nsyzkaller could not find a repro, but in the log, the only suspicious\nsequence was as follows:\n\n 18:26:22 executing program 1:\n r0 = socket$inet6_mptcp(0xa, 0x1, 0x106)\n ...\n connect$inet6(r0, &(0x7f0000000080)={0xa, 0x4001, 0x0, @loopback}, 0x1c) (async)\n\nThe notable thing here is 0x4001 in connect(), which is RDS_TCP_PORT.\n\nSo, the scenario would be:\n\n 1. unshare(CLONE_NEWNET) creates a per netns tcp listener in\n rds_tcp_listen_init().\n 2. syz-executor connect()s to it and creates a reqsk.\n 3. syz-executor exit()s immediately.\n 4. netns is dismantled. [0]\n 5. reqsk timer is fired, and UAF happens while freeing reqsk. [1]\n 6. listener is freed after RCU grace period. [2]\n\nBasically, reqsk assumes that the listener guarantees netns safety\nuntil all reqsk timers are expired by holding the listener's refcount.\nHowever, this was not the case for kernel sockets.\n\nCommit 740ea3c4a0b2 (\"tcp: Clean up kernel listener's reqsk in\ninet_twsk_purge()\") fixed this issue only for per-netns ehash.\n\nLet's apply the same fix for the global ehash.\n\n[0]:\nref_tracker: net notrefcnt@0000000065449cc3 has 1/1 users at\n sk_alloc (./include/net/net_namespace.h:337 net/core/sock.c:2146)\n inet6_create (net/ipv6/af_inet6.c:192 net/ipv6/af_inet6.c:119)\n __sock_create (net/socket.c:1572)\n rds_tcp_listen_init (net/rds/tcp_listen.c:279)\n rds_tcp_init_net (net/rds/tcp.c:577)\n ops_init (net/core/net_namespace.c:137)\n setup_net (net/core/net_namespace.c:340)\n copy_net_ns (net/core/net_namespace.c:497)\n create_new_namespaces (kernel/nsproxy.c:110)\n unshare_nsproxy_namespaces (kernel/nsproxy.c:228 (discriminator 4))\n ksys_unshare (kernel/fork.c:3429)\n __x64_sys_unshare (kernel/fork.c:3496)\n do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129)\n...\nWARNING: CPU: 0 PID: 27 at lib/ref_tracker.c:179 ref_tracker_dir_exit (lib/ref_tracker.c:179)\n\n[1]:\nBUG: KASAN: slab-use-after-free in inet_csk_reqsk_queue_drop (./include/net/inet_hashtables.h:180 net/ipv4/inet_connection_sock.c:952 net/ipv4/inet_connection_sock.c:966)\nRead of size 8 at addr ffff88801b370400 by task swapper/0/0\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\nCall Trace:\n <IRQ>\n dump_stack_lvl (lib/dump_stack.c:107 (discriminator 1))\n print_report (mm/kasan/report.c:378 mm/kasan/report.c:488)\n kasan_report (mm/kasan/report.c:603)\n inet_csk_reqsk_queue_drop (./include/net/inet_hashtables.h:180 net/ipv4/inet_connection_sock.c:952 net/ipv4/inet_connection_sock.c:966)\n reqsk_timer_handler (net/ipv4/inet_connection_sock.c:979 net/ipv4/inet_connection_sock.c:1092)\n call_timer_fn (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/timer.h:127 kernel/time/timer.c:1701)\n __run_timers.part.0 (kernel/time/timer.c:1752 kernel/time/timer.c:2038)\n run_timer_softirq (kernel/time/timer.c:2053)\n __do_softirq (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/irq.h:142 kernel/softirq.c:554)\n irq_exit_rcu (kernel/softirq.c:427 kernel/softirq.c:632 kernel/softirq.c:644)\n sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1076 (discriminator 14))\n </IRQ>\n\nAllocated by task 258 on cpu 0 at 83.612050s:\n kasan_save_stack (mm/kasan/common.c:48)\n kasan_save_track (mm/kasan/common.c:68)\n __kasan_slab_alloc (mm/kasan/common.c:343)\n kmem_cache_alloc (mm/slub.c:3813 mm/slub.c:3860 mm/slub.c:3867)\n copy_net_ns (./include/linux/slab.h:701 net/core/net_namespace.c:421 net/core/net_namespace.c:480)\n create_new_namespaces (kernel/nsproxy.c:110)\n unshare_nsproxy_name\n---truncated---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The essential trigger is local network-namespace lifecycle manipulation — creating a netns (auto-spawning the RDS-TCP kernel listener), creating a pending reqsk, then destroying the netns via process exit. A remote attacker cannot dismantle the target's netns, so the bug is not remotely reachable.\nAC:L - The attacker controls both sides of the timing — reqsk creation and the immediate exit that tears down the netns — and can retry the sequence in a loop until the timer fires against the freed net object; per guidance an attacker-controlled race is Low.\nPR:L - Creating and destroying a network namespace (and thus the per-netns RDS-TCP kernel listener) requires CAP_NET_ADMIN, but this is reachable by any unprivileged user through user namespaces (unshare -Urn), so only low privileges are needed.\nUI:N - The entire sequence is performed by the attacker's own process (unshare, connect, exit); no action from any other user is required.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed 4352-byte net_namespace slab object can be reallocated with attacker-controlled data and is read back in the timer handler, giving a use-after-free read primitive suitable for kernel information disclosure.\nI:H - A use-after-free of the net object enables heap grooming/reallocation and writes into freed memory (the handler also mutates net counters), which can be leveraged into arbitrary-write / control-flow corruption.\nA:H - The use-after-free reliably produces kernel oops/panic (as shown by the KASAN slab-use-after-free splat), causing a system crash."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/ipv4/tcp_minisocks.c"
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],
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"lessThan": "9905a157048f441f1412e7bd13372f4a971d75c6",
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"status": "affected",
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"net/ipv4/tcp_minisocks.c"
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],
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"versions": [
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{
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"version": "4.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.83",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.23",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.7.11",
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"lessThanOrEqual": "6.7.*",
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},
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{
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"version": "6.8.2",
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"lessThanOrEqual": "6.8.*",
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},
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{
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"version": "6.9",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"cpeApplicability": [
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"operator": "OR",
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}
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],
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"title": "rds: tcp: Fix use-after-free of net in reqsk_timer_handler().",
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"content": {
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"timestamp": "2024-06-17T19:18:52.275032Z",
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"id": "CVE-2024-26865",
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"options": [
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