214 lines
11 KiB
JSON
214 lines
11 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-2026-72373",
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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": "2026-08-09T03:40:39.922Z",
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"datePublished": "2026-08-15T05:56:08.564Z",
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"dateUpdated": "2026-10-16T18:55:20.560Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:43:26.499Z"
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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\nafs: Fix missing NULL pointer check in afs_break_some_callbacks()\n\nFix afs_break_some_callbacks() to check to see if afs_lookup_volume_rcu()\nreturned NULL (e.g. the specified volume is unknown)."
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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:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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 - The bug is reached when an AFS fileserver sends a CB.CallBack/YFSCB.CallBack RPC over RxRPC to the kernel cache-manager listener; processing flows through SRXAFSCB_CallBack() to afs_break_some_callbacks() with no local syscall required.\nAC:L - A malicious or compromised fileserver that already has an encrypted RxRPC callback channel can reliably send a volume-level callback break (vnode=0, unique=0) for an arbitrary unknown volume ID, deterministically driving afs_lookup_volume_rcu() to return NULL and crash.\nPR:N - Exploitation requires no privileges on the victim host; a remote peer authenticated as a known AFS fileserver can deliver the crafted callback break without the attacker holding local user, capability, or namespace rights on the client.\nUI:N - Once AFS is mounted and a server callback connection exists, triggering the NULL dereference needs no further end-user action—the fileserver can unilaterally send the malformed callback notification at any time.\nS:U - Impact is confined to kernel memory in the AFS client callback path (NULL dereference and possible oops/panic); it does not cross a VM, container, or IOMMU security boundary to affect a different authority.\nC:N - The failure mode is a NULL pointer dereference on volume->servers in afs_break_volume_callback(); there is no out-of-bounds access, use-after-free, or other memory corruption that could disclose kernel data.\nI:N - The bug causes an immediate invalid read through a NULL volume pointer and does not provide controlled writes, metadata corruption, or a path to arbitrary code execution beyond crashing the kernel.\nA:H - Hitting afs_break_volume_callback() with a NULL volume dereferences volume->servers under RCU, provoking a kernel oops or panic and denying availability to the entire system until reboot."
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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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"fs/afs/callback.c"
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],
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{
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"lessThan": "a99a617701186dc68c7b330d35fc2253f48e2ab2",
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{
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"programFiles": [
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"fs/afs/callback.c"
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],
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"versions": [
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{
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"version": "5.8",
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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": "5.8",
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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": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"operator": "OR",
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"cpeMatch": [
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"versionStartIncluding": "5.8",
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"versionEndExcluding": "6.12.97"
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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/a99a617701186dc68c7b330d35fc2253f48e2ab2"
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},
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{
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"url": "https://git.kernel.org/stable/c/5492799ec5d27be3bd454dcaf046bc7054f637ae"
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},
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{
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"url": "https://git.kernel.org/stable/c/e3e59ff22a0de01ed0cf3a3e25558811abc3b70a"
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},
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{
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"url": "https://git.kernel.org/stable/c/794a01110390c1b76f59ece773fb0fbfd89c6f5c"
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}
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],
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"title": "afs: Fix missing NULL pointer check in afs_break_some_callbacks()",
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"x_generator": {
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"adp": [
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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-2026-72373",
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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": "yes"
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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": "2026-10-16T18:48:08.172358Z"
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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": "2026-10-16T18:55:20.560Z"
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} |