264 lines
14 KiB
JSON
264 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-2026-98524",
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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": "2026-09-25T10:25:14.355Z",
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"datePublished": "2026-10-18T15:17:41.420Z",
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"dateUpdated": "2026-10-24T14:09:17.970Z"
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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": "2026-10-24T14:09:17.970Z"
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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\nrds: ib: Clear the sg list when mapping an MR fails\n\nrds_ib_map_frmr() stores the caller's scatterlist in the MR before DMA\nmapping and registration can fail. On failure, __rds_rdma_map() unpins\nthe pages and frees the scatterlist, but rds_ib_free_frmr() can still\nreturn the MR to the pool with the stale pointer set.\n\nThis leaves the pool with a dangling scatterlist and can lead to local\nprivilege escalation. KASAN detects the resulting use-after-free when the\nMR is later torn down:\n\nBUG: KASAN: slab-use-after-free in __rds_ib_teardown_mr\nRead of size 8\n\nCall Trace:\n __rds_ib_teardown_mr\n rds_ib_unreg_frmr\n rds_ib_flush_mr_pool\n rds_ib_flush_mrs\n rds_free_mr\n rds_setsockopt\n\nStore the scatterlist in the MR only after DMA mapping succeeds. If DMA\nmapping fails, return directly while the MR fields remain clear; the caller\nkeeps ownership of the scatterlist and its pinned pages. If a later\nregistration step fails, unmap the scatterlist and clear the MR fields\nbefore returning."
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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 attacker reaches patched rds_ib_map_frmr() through sendmsg() with a local RDS_CMSG_RDMA_MAP control message; no RDS packet field from a remote peer supplies the scatterlist or faulty ownership state.\nAC:L - On HNS hardware, the attacker can start an outgoing RDS connection and retry sendmsg() while its QP is RESET/INIT/RTR; check_send_valid() makes hns_roce_v2_post_send() return -EINVAL to rds_ib_post_reg_frmr(), creating the required failure.\nPR:L - rds_create(), rds_bind(), and rds_sendmsg() impose no capability or authentication check, and __rds_rdma_map() accepts an unprivileged process whenever can_do_mlock() sees a nonzero RLIMIT_MEMLOCK; RDS/IB merely requires the host's initial network namespace.\nUI:N - The attacking process performs both RDS_CMSG_RDMA_MAP and the zero-cookie setsockopt(SOL_RDS, RDS_FREE_MR) that calls rds_ib_flush_mrs(); no victim action is required.\nS:U - The stale ibmr->sg is consumed by __rds_ib_teardown_mr() within the host kernel, so exploitation elevates authority inside that same kernel rather than crossing a VM, IOMMU, or other security boundary.\nC:H - __rds_ib_teardown_mr() obtains page pointers with sg_page() from a freed, reclaimable scatterlist; attacker-controlled reclamation and the subsequent invalid free can enable kernel-memory compromise and disclosure.\nI:H - Teardown passes page pointers taken from the stale scatterlist to unpin_user_pages_dirty_lock() and then kfree()s the already-freed or reallocated array, enabling page-refcount and heap corruption usable for arbitrary writes or control-flow takeover.\nA:H - The observed slab use-after-free occurs in __rds_ib_teardown_mr(); dereferencing an invalid sg_page(), unpinning the resulting bogus page, or freeing the dangling scatterlist can produce a kernel oops or panic."
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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/rds/ib_frmr.c"
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],
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"versions": [
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{
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"version": "1659185fb4d0025835eb2058a141f0746c5cab00",
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"lessThan": "1be3211e6ac77adbb1eac01314d989d243b32c59",
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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": "1659185fb4d0025835eb2058a141f0746c5cab00",
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"lessThan": "c42d316163f89cd23de2f3e24558177a8c29bad8",
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"status": "affected",
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"versionType": "git"
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},
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{
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"status": "affected",
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},
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{
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"version": "1659185fb4d0025835eb2058a141f0746c5cab00",
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"lessThan": "49ba5ed0129906e0362c2e4b5e21c89b2a41e115",
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"status": "affected",
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},
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"lessThan": "4468df5bcdef959fd96494e9968f323561a45f4c",
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"status": "affected",
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"versionType": "git"
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{
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"version": "1659185fb4d0025835eb2058a141f0746c5cab00",
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"lessThan": "e2ee0616260080376123997488b5cf8a3870b8d9",
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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": "1659185fb4d0025835eb2058a141f0746c5cab00",
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"lessThan": "b36d32f30c3f1e58e3a5ae79d0f52836a316b36e",
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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": "1659185fb4d0025835eb2058a141f0746c5cab00",
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"lessThan": "58eb1b3325edac42dc6df72c80962bd53a3c8ca7",
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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/rds/ib_frmr.c"
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],
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"versions": [
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{
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"version": "4.6",
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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": "4.6",
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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": "5.10.271",
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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": "5.15.222",
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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": "6.1.189",
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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": "6.6.158",
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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": "6.12.112",
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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": "6.18.55",
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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": "7.2.9",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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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"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/1be3211e6ac77adbb1eac01314d989d243b32c59"
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},
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{
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"url": "https://git.kernel.org/stable/c/c42d316163f89cd23de2f3e24558177a8c29bad8"
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},
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{
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"url": "https://git.kernel.org/stable/c/8dca3c81344532a7f05edb3d12f31f3009410a90"
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},
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{
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"url": "https://git.kernel.org/stable/c/49ba5ed0129906e0362c2e4b5e21c89b2a41e115"
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},
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{
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"url": "https://git.kernel.org/stable/c/4468df5bcdef959fd96494e9968f323561a45f4c"
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},
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{
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"url": "https://git.kernel.org/stable/c/e2ee0616260080376123997488b5cf8a3870b8d9"
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},
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{
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"url": "https://git.kernel.org/stable/c/b36d32f30c3f1e58e3a5ae79d0f52836a316b36e"
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},
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{
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"url": "https://git.kernel.org/stable/c/58eb1b3325edac42dc6df72c80962bd53a3c8ca7"
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}
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],
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"title": "rds: ib: Clear the sg list when mapping an MR fails",
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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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}
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} |