138 lines
9.4 KiB
JSON
138 lines
9.4 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-2025-38233",
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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": "2025-04-16T04:51:23.996Z",
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"datePublished": "2025-07-04T13:37:46.293Z",
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"dateUpdated": "2026-08-05T12:00:33.319Z"
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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": "2026-08-05T12:00:33.319Z"
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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\npowerpc64/ftrace: fix clobbered r15 during livepatching\n\nWhile r15 is clobbered always with PPC_FTRACE_OUT_OF_LINE, it is\nnot restored in livepatch sequence leading to not so obvious fails\nlike below:\n\n BUG: Unable to handle kernel data access on write at 0xc0000000000f9078\n Faulting instruction address: 0xc0000000018ff958\n Oops: Kernel access of bad area, sig: 11 [#1]\n ...\n NIP: c0000000018ff958 LR: c0000000018ff930 CTR: c0000000009c0790\n REGS: c00000005f2e7790 TRAP: 0300 Tainted: G K (6.14.0+)\n MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 2822880b XER: 20040000\n CFAR: c0000000008addc0 DAR: c0000000000f9078 DSISR: 0a000000 IRQMASK: 1\n GPR00: c0000000018f2584 c00000005f2e7a30 c00000000280a900 c000000017ffa488\n GPR04: 0000000000000008 0000000000000000 c0000000018f24fc 000000000000000d\n GPR08: fffffffffffe0000 000000000000000d 0000000000000000 0000000000008000\n GPR12: c0000000009c0790 c000000017ffa480 c00000005f2e7c78 c0000000000f9070\n GPR16: c00000005f2e7c90 0000000000000000 0000000000000000 0000000000000000\n GPR20: 0000000000000000 c00000005f3efa80 c00000005f2e7c60 c00000005f2e7c88\n GPR24: c00000005f2e7c60 0000000000000001 c0000000000f9078 0000000000000000\n GPR28: 00007fff97960000 c000000017ffa480 0000000000000000 c0000000000f9078\n ...\n Call Trace:\n check_heap_object+0x34/0x390 (unreliable)\n __mutex_unlock_slowpath.isra.0+0xe4/0x230\n seq_read_iter+0x430/0xa90\n proc_reg_read_iter+0xa4/0x200\n vfs_read+0x41c/0x510\n ksys_read+0xa4/0x190\n system_call_exception+0x1d0/0x440\n system_call_vectored_common+0x15c/0x2ec\n\nFix it by restoring r15 always."
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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 corrupted register is consumed by ordinary kernel code paths entered through local syscalls — the reported oops comes from a plain read(2) on a procfs file (`ksys_read → vfs_read → seq_read_iter`). No network protocol handler is inherently involved; reaching the defect requires executing kernel code on the machine.\nAC:L - With a livepatch active, the missing `REST_GPR(15, r1)` executes on 100% of calls to any patched function — no race, no memory-layout dependency, no timing window. The enabling configuration (ppc64le with `PPC_FTRACE_OUT_OF_LINE` + `LIVEPATCH`) is the default shipping state on enterprise ppc64le distros that offer live patching.\nPR:L - Triggering needs nothing more than invoking a syscall that reaches a livepatched function; the reproducer is an unprivileged `read()` on /proc. The livepatch itself is loaded by the administrator as routine maintenance, not as an attacker step, so the attacker only needs an ordinary local account.\nUI:N - Once a livepatch is applied — the normal steady state of a live-patched server — no victim action of any kind is required; the attacker simply calls into a patched function.\nS:U - The clobbered non-volatile register corrupts the kernel's own execution state within the same security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The caller chain resumes with r15 silently replaced by a kernel `.text` stub address, so any function using r15 as a pointer, index, or length operates on corrupted state — on read/usercopy paths (`seq_read_iter`, `check_heap_object` in the reported trace) this can steer kernel memory into a user buffer, and the injected value itself is a live kernel text address that defeats KASLR if it reaches userspace.\nI:H - This is genuine kernel memory corruption with write effect — the reported failure is a faulting *store* to an address derived from the clobbered register, from inside `__mutex_unlock_slowpath` operating on a corrupt mutex pointer. Corrupting a callee-saved register in arbitrary kernel functions yields uncontrolled writes and corrupted locking/data structures that can be leveraged for control-flow-relevant damage.\nA:H - The demonstrated result is an immediate kernel oops (\"Unable to handle kernel data access on write\", sig 11), and because the corruption recurs on every call to a patched function it is trivially repeatable until the system panics or hangs on corrupted lock state."
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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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"arch/powerpc/kernel/trace/ftrace_entry.S"
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],
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"versions": [
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{
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"version": "eec37961a56aa4f3fe1c33ffd48eec7d1bb0c009",
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"lessThan": "a9212bf5ca640232254b31330e86272fe4073bc9",
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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": "eec37961a56aa4f3fe1c33ffd48eec7d1bb0c009",
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"lessThan": "cb5b691f8273432297611863ac142e17119279e0",
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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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"arch/powerpc/kernel/trace/ftrace_entry.S"
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],
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"versions": [
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{
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"version": "6.13",
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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": "6.13",
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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": "6.15.4",
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"lessThanOrEqual": "6.15.*",
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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": "6.16",
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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": "6.13",
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"versionEndExcluding": "6.15.4"
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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": "6.13",
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"versionEndExcluding": "6.16"
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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/a9212bf5ca640232254b31330e86272fe4073bc9"
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},
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{
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"url": "https://git.kernel.org/stable/c/cb5b691f8273432297611863ac142e17119279e0"
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}
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],
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"title": "powerpc64/ftrace: fix clobbered r15 during livepatching",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |