318 lines
16 KiB
JSON
318 lines
16 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-2024-44986",
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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": "2024-08-21T05:34:56.671Z",
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"datePublished": "2024-09-04T19:54:34.852Z",
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"dateUpdated": "2026-09-29T12:17:53.380Z"
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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": "2026-09-29T12:17:53.380Z"
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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\nipv6: fix possible UAF in ip6_finish_output2()\n\nIf skb_expand_head() returns NULL, skb has been freed\nand associated dst/idev could also have been freed.\n\nWe need to hold rcu_read_lock() to make sure the dst and\nassociated idev are alive."
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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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.1,
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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:N - `ip6_finish_output2()` is the core IPv6 transmit path, driven by remote traffic — forwarded packets, TCP/ICMPv6 responses generated for received datagrams, in-kernel server replies (nfsd/ksmbd over IPv6), and TEE/dup mirroring of received frames — so a remote unauthenticated peer can keep the vulnerable code executing continuously without any local access.\nAC:H - Exploitation requires a GFP_ATOMIC allocation failure inside `skb_expand_head()`, coinciding with the skb holding the last `dst` reference whose `rt6i_idev` is in turn the last `inet6_dev` reference (i.e. a concurrent `addrconf_ifdown`/netdev teardown), and an RCU grace period completing in the handful of instructions between `kfree_skb()` and `IP6_INC_STATS()` — conditions the attacker can influence only statistically, not command.\nPR:N - No credential, capability, or authentication check exists anywhere on the output path; the packet that drives `ip6_finish_output2()` is forwarded or generated in response to unauthenticated remote traffic.\nUI:N - The transmit path executes automatically on packet forwarding or response generation; no local user must open, mount, or otherwise interact with anything.\nS:U - The freed `inet6_dev` and its per-CPU SNMP array are kernel objects in the same security authority as the code that touches them; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The `_DEVINC` macro reads `idev->stats.ipv6` out of a freed slab object, and per kernel UAF convention a stale read of a reclaimable heap object that the attacker can groom with concurrent traffic constitutes a high-confidentiality read primitive.\nI:H - After the stale pointer is read, `SNMP_INC_STATS64()` performs a `this_cpu_inc()` through it — if the `inet6_dev` slab object has been reclaimed with attacker-sprayed data this becomes a controlled increment at a chosen kernel address, a classic write primitive escalatable to control-flow hijacking; the freed per-CPU MIB is also written.\nA:H - The use-after-free write into freed slab/per-CPU memory panics KASAN and `panic_on_warn` kernels outright, and on stock kernels corrupts whatever allocation reclaimed the `inet6_dev`, causing an oops in the IPv6 transmit path."
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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/ipv6/ip6_output.c"
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],
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"versions": [
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{
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"version": "ded37d03440d0ab346a8287cc2ba88b8dc90ceb0",
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"lessThan": "ae8512e93f4ce47614ca89defaec1b93e00697b8",
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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": "2323690eb05865a657709f4d28eb9538ea97bfc2",
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"lessThan": "1504108cb6020df7b1a31c9bb80fd587470aa448",
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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": "5796015fa968a3349027a27dcd04c71d95c53ba5",
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"lessThan": "e891b36de161fcd96f12ff83667473e5067b9037",
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"status": "affected",
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},
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{
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"version": "5796015fa968a3349027a27dcd04c71d95c53ba5",
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"lessThan": "3574d28caf9a09756ae87ad1ea096c6f47b6101e",
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"status": "affected",
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{
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"version": "5796015fa968a3349027a27dcd04c71d95c53ba5",
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"lessThan": "6ab6bf731354a6fdbaa617d1ec194960db61cf3b",
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"status": "affected",
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{
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"version": "5796015fa968a3349027a27dcd04c71d95c53ba5",
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"lessThan": "56efc253196751ece1fc535a5b582be127b0578a",
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"status": "affected",
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{
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"version": "5796015fa968a3349027a27dcd04c71d95c53ba5",
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"lessThan": "da273b377ae0d9bd255281ed3c2adb228321687b",
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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": "b34c668a867ffdcf8bd8db4a36512572e82b4a15",
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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": "5.4.137",
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"lessThan": "5.4.289",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.10.55",
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"lessThan": "5.10.233",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.13.7",
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"lessThan": "5.14",
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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/ipv6/ip6_output.c"
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],
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"versions": [
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{
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"version": "5.14",
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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": "5.14",
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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": "5.4.289",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.233",
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"lessThanOrEqual": "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": "5.15.166",
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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": "6.1.107",
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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": "6.6.48",
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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": "6.10.7",
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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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"url": "https://git.kernel.org/stable/c/e891b36de161fcd96f12ff83667473e5067b9037"
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"url": "https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e"
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{
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"url": "https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b"
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{
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"url": "https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a"
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"url": "https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b"
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}
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],
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"title": "ipv6: fix possible UAF in ip6_finish_output2()",
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"type": "ssvc",
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"content": {
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"timestamp": "2024-09-04T20:20:05.005399Z",
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"id": "CVE-2024-44986",
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"options": [
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{
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"Exploitation": "none"
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"dateUpdated": "2024-09-04T20:21:13.628Z"
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"title": "CVE Program Container",
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} |