256 lines
14 KiB
JSON
256 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-2024-46754",
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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": "2024-09-11T15:12:18.270Z",
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"datePublished": "2024-09-18T07:12:13.780Z",
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"dateUpdated": "2026-09-02T12:49:13.346Z"
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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": "2026-09-02T12:49:13.346Z"
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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\nbpf: Remove tst_run from lwt_seg6local_prog_ops.\n\nThe syzbot reported that the lwt_seg6 related BPF ops can be invoked\nvia bpf_test_run() without without entering input_action_end_bpf()\nfirst.\n\nMartin KaFai Lau said that self test for BPF_PROG_TYPE_LWT_SEG6LOCAL\nprobably didn't work since it was introduced in commit 04d4b274e2a\n(\"ipv6: sr: Add seg6local action End.BPF\"). The reason is that the\nper-CPU variable seg6_bpf_srh_states::srh is never assigned in the self\ntest case but each BPF function expects it.\n\nRemove test_run for BPF_PROG_TYPE_LWT_SEG6LOCAL."
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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 only entry point is the local `bpf(BPF_PROG_TEST_RUN)` syscall against a `BPF_PROG_TYPE_LWT_SEG6LOCAL` program fd; no packet ever reaches this path from the network, since real SRv6 traffic goes through `input_action_end_bpf()` which initializes the state correctly.\nAC:L - A single `BPF_PROG_TEST_RUN` calling `bpf_lwt_seg6_action(END_B6_ENCAP)` deterministically hits `dev_net(skb_dst(skb)->dev)` with a NULL dst, with no race, no timing window and no layout luck; the UAF variant needs only ordinary heap grooming that the attacker fully drives by choosing `data_size_in` (slab cache), `srhoff` (offset) and CPU affinity.\nPR:L - `bpf_prog_test_run()` itself performs zero capability check — it only does `bpf_prog_get(attr->test.prog_fd)` — so any unprivileged local process that inherits or receives a seg6local program fd (fork/exec, `SCM_RIGHTS`, or a permissively-moded bpffs pin) can trigger it, and BPF tokens in 6.9+ deliberately delegate `CAP_BPF`/`CAP_NET_ADMIN` program loading to unprivileged users inside containers.\nUI:N - The attacker issues the `bpf()` syscalls entirely on their own; no victim action, mount, file open, or administrator step is involved at any point.\nS:U - The NULL dereference, out-of-bounds read and slab use-after-free all occur in kernel context within the same security authority the calling process already interacts with; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The dangling per-CPU `srh_state->srh` lets `seg6_validate_srh()` walk TLVs through a freed, attacker-reclaimed slab object, and `seg6_do_srh_inline()`'s `memmove(hdr, oldhdr, 40)` on a short test packet reads up to 40 bytes past `skb->tail` which are then returned to userspace via `bpf_test_finish()`'s `data_out`.\nI:H - `seg6_bpf_has_valid_srh()` executes `srh->hdrlen = (u8)(srh_state->hdrlen >> 3)` through the stale pointer, giving an attacker-valued one-byte write at an attacker-chosen offset inside a freed object in an attacker-selected kmalloc cache — a reclaim primitive suitable for corrupting length/flag fields of a sprayed victim structure and escalating.\nA:H - `bpf_lwt_seg6_action(END_B6_ENCAP)` reliably oopses the kernel on `dev_net(skb_dst(skb)->dev)` because the test skb carries no dst, and post-`d1542d4ae4df` the same path also trips `lockdep_assert_held()`, which is a panic under `panic_on_warn`."
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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/filter.c"
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],
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"versions": [
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{
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"version": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "ea3fae6984ba0f054550e4da22219489c12cd8d4",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "a675524cfbe88fd49c05ff8807a08646983e687c",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "b05c2e25a5c168dbb46b6f7fcb741fd4e4f3b54a",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "e217492f6fa2228ad703ee3006d8fc4e5969fbd4",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "9cd15511de7c619bbd0f54bb3f28e6e720ded5d6",
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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": "004d4b274e2a1a895a0e5dc66158b90a7d463d44",
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"lessThan": "c13fda93aca118b8e5cd202e339046728ee7dddb",
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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/core/filter.c"
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],
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"versions": [
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{
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"version": "4.18",
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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": "4.18",
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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": "5.10.269",
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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": "5.15.220",
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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": "6.1.187",
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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": "6.6.156",
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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": "6.10.10",
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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": "4.18",
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"versionEndExcluding": "5.10.269"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ea3fae6984ba0f054550e4da22219489c12cd8d4"
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},
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{
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"url": "https://git.kernel.org/stable/c/a675524cfbe88fd49c05ff8807a08646983e687c"
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},
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{
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"url": "https://git.kernel.org/stable/c/b05c2e25a5c168dbb46b6f7fcb741fd4e4f3b54a"
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},
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{
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"url": "https://git.kernel.org/stable/c/e217492f6fa2228ad703ee3006d8fc4e5969fbd4"
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},
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{
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"url": "https://git.kernel.org/stable/c/9cd15511de7c619bbd0f54bb3f28e6e720ded5d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/c13fda93aca118b8e5cd202e339046728ee7dddb"
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}
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],
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"title": "bpf: Remove tst_run from lwt_seg6local_prog_ops.",
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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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"timestamp": "2024-09-29T14:46:48.262114Z",
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"id": "CVE-2024-46754",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2024-09-29T14:47:03.068Z"
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}
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}
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]
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}
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} |