248 lines
14 KiB
JSON
248 lines
14 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-2024-44934",
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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": "2024-08-21T05:34:56.664Z",
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"datePublished": "2024-08-26T10:11:25.809Z",
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"dateUpdated": "2026-08-05T11:37:07.351Z"
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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": "2026-08-05T11:37:07.351Z"
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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: bridge: mcast: wait for previous gc cycles when removing port\n\nsyzbot hit a use-after-free[1] which is caused because the bridge doesn't\nmake sure that all previous garbage has been collected when removing a\nport. What happens is:\n CPU 1 CPU 2\n start gc cycle remove port\n acquire gc lock first\n wait for lock\n call br_multicasg_gc() directly\n acquire lock now but free port\n the port can be freed\n while grp timers still\n running\n\nMake sure all previous gc cycles have finished by using flush_work before\nfreeing the port.\n\n[1]\n BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699\n\n CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024\n Call Trace:\n <IRQ>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\n call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792\n expire_timers kernel/time/timer.c:1843 [inline]\n __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417\n __run_timer_base kernel/time/timer.c:2428 [inline]\n __run_timer_base kernel/time/timer.c:2421 [inline]\n run_timer_base+0x111/0x190 kernel/time/timer.c:2437"
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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 vulnerable path is entered only by removing a port from a bridge via local RTNL netlink (`ip link set dev X nomaster`) or the `SIOCBRDELIF` ioctl; received packets alone cannot trigger the port teardown. This requires local system access.\nAC:L - Although this is a race between the mcast gc workqueue and `br_multicast_del_port()`, the attacker drives both sides — populating/expiring port groups to queue gc work while concurrently deleting the port from another CPU — and can retry unboundedly, as demonstrated by the syzbot reproducer.\nPR:L - Bridge creation and port add/remove need only CAP_NET_ADMIN within a network namespace, which any unprivileged user obtains via `unshare -Urn` on default-configured distros; no real root is required.\nUI:N - The attacker performs every step — creating the bridge, generating multicast group state, and removing the port — with no action by any other user.\nS:U - The use-after-free is confined to kernel memory within the same security authority; it does not cross a VM, hypervisor, or IOMMU boundary.\nC:H - The expiring timer reads freed `net_bridge_port` memory (`pg->key.port->br`) and then dereferences that value as a bridge structure; controlling the reclaimed slab yields an arbitrary kernel read primitive and disclosure of kernel memory.\nI:H - After the port slab is reclaimed with attacker-controlled data, the callback performs `spin_lock(&br->multicast_lock)` and structured list/notify operations through the forged pointer, giving controlled kernel writes and a path to control-flow hijack.\nA:H - Even without exploitation the UAF causes a KASAN splat, oops, or panic when the group timer fires against the freed port, crashing the kernel."
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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/bridge/br_multicast.c"
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],
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"versions": [
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{
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"version": "e12cec65b5546f19217e26aafb8add6e2fadca18",
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"lessThan": "1e16828020c674b3be85f52685e8b80f9008f50f",
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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": "e12cec65b5546f19217e26aafb8add6e2fadca18",
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"lessThan": "0d8b26e10e680c01522d7cc14abe04c3265a928f",
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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": "e12cec65b5546f19217e26aafb8add6e2fadca18",
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"lessThan": "e3145ca904fa8dbfd1a5bf0187905bc117b0efce",
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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": "e12cec65b5546f19217e26aafb8add6e2fadca18",
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"lessThan": "b2f794b168cf560682ff976b255aa6d29d14a658",
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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": "e12cec65b5546f19217e26aafb8add6e2fadca18",
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"lessThan": "92c4ee25208d0f35dafc3213cdf355fbe449e078",
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"status": "affected",
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"versionType": "git"
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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/bridge/br_multicast.c"
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],
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"versions": [
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{
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"version": "5.10",
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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": "5.10",
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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": "5.15.165",
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"lessThanOrEqual": "5.15.*",
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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": "6.1.105",
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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": "6.6.46",
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"lessThanOrEqual": "6.6.*",
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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": "6.10.5",
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"lessThanOrEqual": "6.10.*",
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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": "6.11",
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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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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "5.15.165"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "6.1.105"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "6.6.46"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "6.10.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10",
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"versionEndExcluding": "6.11"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f"
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},
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{
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"url": "https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce"
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},
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{
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"url": "https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658"
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},
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{
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"url": "https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078"
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}
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],
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"title": "net: bridge: mcast: wait for previous gc cycles when removing port",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-44934",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T15:27:51.533304Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-12T17:32:55.981Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T22:13:38.280Z"
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}
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}
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]
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}
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} |