186 lines
13 KiB
JSON
186 lines
13 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-2023-53752",
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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": "2025-12-08T01:18:04.279Z",
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"datePublished": "2025-12-08T01:19:12.407Z",
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"dateUpdated": "2026-08-05T09:15:48.993Z"
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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": "2026-08-05T09:15:48.993Z"
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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\nnet: deal with integer overflows in kmalloc_reserve()\n\nBlamed commit changed:\n ptr = kmalloc(size);\n if (ptr)\n size = ksize(ptr);\n\n size = kmalloc_size_roundup(size);\n ptr = kmalloc(size);\n\nThis allowed various crash as reported by syzbot [1]\nand Kyle Zeng.\n\nProblem is that if @size is bigger than 0x80000001,\nkmalloc_size_roundup(size) returns 2^32.\n\nkmalloc_reserve() uses a 32bit variable (obj_size),\nso 2^32 is truncated to 0.\n\nkmalloc(0) returns ZERO_SIZE_PTR which is not handled by\nskb allocations.\n\nFollowing trace can be triggered if a netdev->mtu is set\nclose to 0x7fffffff\n\nWe might in the future limit netdev->mtu to more sensible\nlimit (like KMALLOC_MAX_SIZE).\n\nThis patch is based on a syzbot report, and also a report\nand tentative fix from Kyle Zeng.\n\n[1]\nBUG: KASAN: user-memory-access in __build_skb_around net/core/skbuff.c:294 [inline]\nBUG: KASAN: user-memory-access in __alloc_skb+0x3c4/0x6e8 net/core/skbuff.c:527\nWrite of size 32 at addr 00000000fffffd10 by task syz-executor.4/22554\n\nCPU: 1 PID: 22554 Comm: syz-executor.4 Not tainted 6.1.39-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023\nCall trace:\ndump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:279\nshow_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:286\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x120/0x1a0 lib/dump_stack.c:106\nprint_report+0xe4/0x4b4 mm/kasan/report.c:398\nkasan_report+0x150/0x1ac mm/kasan/report.c:495\nkasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189\nmemset+0x40/0x70 mm/kasan/shadow.c:44\n__build_skb_around net/core/skbuff.c:294 [inline]\n__alloc_skb+0x3c4/0x6e8 net/core/skbuff.c:527\nalloc_skb include/linux/skbuff.h:1316 [inline]\nigmpv3_newpack+0x104/0x1088 net/ipv4/igmp.c:359\nadd_grec+0x81c/0x1124 net/ipv4/igmp.c:534\nigmpv3_send_cr net/ipv4/igmp.c:667 [inline]\nigmp_ifc_timer_expire+0x1b0/0x1008 net/ipv4/igmp.c:810\ncall_timer_fn+0x1c0/0x9f0 kernel/time/timer.c:1474\nexpire_timers kernel/time/timer.c:1519 [inline]\n__run_timers+0x54c/0x710 kernel/time/timer.c:1790\nrun_timer_softirq+0x28/0x4c kernel/time/timer.c:1803\n_stext+0x380/0xfbc\n____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79\ncall_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891\ndo_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:84\ninvoke_softirq kernel/softirq.c:437 [inline]\n__irq_exit_rcu+0x1c0/0x4cc kernel/softirq.c:683\nirq_exit_rcu+0x14/0x78 kernel/softirq.c:695\nel0_interrupt+0x7c/0x2e0 arch/arm64/kernel/entry-common.c:717\n__el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:724\nel0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:729\nel0t_64_irq+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584"
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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 - Triggering the overflow requires a locally-configured netdev MTU near 0x7fffffff (set via rtnetlink/ioctl) plus a local socket joining a multicast group; no remote peer can induce a >2GB skb allocation. The vulnerable code is thus reached only through local syscalls.\nAC:L - The overflow is fully deterministic — kmalloc(0) always returns ZERO_SIZE_PTR with no memory pressure or timing dependency, so every IGMP/MLD report on the oversized-MTU device corrupts memory. No race, memory-layout guess, or condition outside attacker control is involved.\nPR:L - Setting a huge MTU needs CAP_NET_ADMIN, but an unprivileged user obtains it over their own netns via `unshare -Urn`, and the always-present `lo` device has no max_mtu cap — verified working on a current kernel. Joining the multicast group that arms the IGMP timer needs no privileges at all.\nUI:N - The attacker performs every step themselves — namespace creation, MTU configuration, and the multicast join that arms the IGMP timer. No victim action is required.\nS:U - The corruption occurs within the kernel's own memory-management and skb handling, the same security authority as the vulnerable component. No VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The skb is built with head=ZERO_SIZE_PTR and a ~4GB end offset, so skb_shared_info and packet data land at low, user-mappable addresses; on systems without SMAP/PAN (ARM/embedded/older x86, as in the arm64 syzbot report where the access actually reached user memory) the attacker can pre-map that page and have the kernel populate attacker-readable memory, and the resulting control over shinfo->frags gives an arbitrary kernel read primitive.\nI:H - This is an unbounded wild-write: the kernel memsets and then writes packet contents through a bogus head pointer at attacker-influenced offsets, and if skb_shared_info is placed in attacker-mapped memory the kernel dereferences attacker-controlled nr_frags/frags[]/frag_list/destructor_arg, yielding an arbitrary write and control-flow hijack primitive.\nA:H - In the common case the wild write hits an unmapped or SMAP-protected address from softirq (timer) context, producing an immediate kernel oops/panic as shown in the syzbot KASAN report. The crash is reliably reproducible by any local unprivileged user."
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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/core/skbuff.c"
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],
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"versions": [
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{
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"version": "0dbc898f5917c5a3bec6be19d9f5469cbc351a7d",
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"lessThan": "31cf7853a940181593e4472fc56f46574123f9f6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "12d6c1d3a2ad0c199ec57c201cdc71e8e157a232",
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"lessThan": "e4ffc47a1c3e5d11a853aa178c9a5136e79412e9",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "12d6c1d3a2ad0c199ec57c201cdc71e8e157a232",
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"lessThan": "bf7da02d2b8faf324206e1cbe64a4813ff903cc1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "12d6c1d3a2ad0c199ec57c201cdc71e8e157a232",
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"lessThan": "915d975b2ffa58a14bfcf16fafe00c41315949ff",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.1.31",
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"lessThan": "6.1.54",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/core/skbuff.c"
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],
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"versions": [
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{
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"version": "6.2",
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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": "6.2",
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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": "6.1.54",
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"lessThanOrEqual": "6.1.*",
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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": "6.4.16",
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"lessThanOrEqual": "6.4.*",
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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": "6.5.3",
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"lessThanOrEqual": "6.5.*",
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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": "6.6",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.31",
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"versionEndExcluding": "6.1.54"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/31cf7853a940181593e4472fc56f46574123f9f6"
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},
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{
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"url": "https://git.kernel.org/stable/c/e4ffc47a1c3e5d11a853aa178c9a5136e79412e9"
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},
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{
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"url": "https://git.kernel.org/stable/c/bf7da02d2b8faf324206e1cbe64a4813ff903cc1"
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},
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{
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"url": "https://git.kernel.org/stable/c/915d975b2ffa58a14bfcf16fafe00c41315949ff"
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}
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],
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"title": "net: deal with integer overflows in kmalloc_reserve()",
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