Exploit discussion active in current signal (1 latest mentions)
Recommended action window: High priority (within 72h)
NVD description
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix a use-after-free problem in rxe_mmap rxe_mmap() removes a rxe_mmap_info struct from the pending_mmaps list and releases pending_lock while the struct's kref is still at 1: list_del_init(&ip->pending_mmaps); spin_unlock_bh(&rxe->pending_lock); /* ref == 1, no lock held */ ret = remap_vmalloc_range(vma, ip->obj, 0); /* walks PTEs */ [...] rxe_vma_open(vma); /* kref_get, ref → 2 */ remap_vmalloc_range_partial() walks PTEs without any lock. A concurrent DESTROY_CQ ioctl on another CPU calls: kref_put(&q->ip->ref, rxe_mmap_release) /* ref 1→0 */ vfree(ip->obj) /* clears vmalloc PTEs mid-walk */ kfree(ip) /* frees rxe_mmap_info */ This yields: 1. Kernel crash, vmalloc_to_page() returns NULL when vfree wins the per-PTE race -> vm_insert_page(NULL) → GPF in validate_page_before_insert 2. Page UAF, vmalloc_to_page() reads a stale PTE before vfree clears it. User VMA holds a PTE to a free'd page which might eventually get reallocated later by vmalloc which allows the attacker to get a clean page-level UAF. It is worth noting that even though a page-level UAF is possible given the strong primitive, it is statistically very difficult to achieve given the very short time window (after the last insert_page and before the kref_get). The call trace are as below: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 1000 PID: 413 Comm: poc Not tainted 7.0.0-rc5-dirty #28 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:validate_page_before_insert+0x32/0x300 Code: e5 41 57 41 56 49 89 fe 41 55 41 54 53 48 89 f3 e8 93 b5 a3 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 7b 02 00 00 4c 8b 63 08 31 ff 4d 89 e5 41 83 e5 RSP: 0018:ffff88811b15f2f0 EFLAGS: 00000202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008 RBP: ffff88811b15f318 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881181eee00 R13: 0000000000000000 R14: ffff8881181eee00 R15: ffff8881181eee20 FS: 00007b1e000f76c0(0000) GS:ffff8884268e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007b1e00a24ac0 CR3: 0000000116eb3000 CR4: 00000000000006f0 Call Trace: <TASK> insert_page+0x8f/0x190 ? __pfx_insert_page+0x10/0x10 ? kasan_save_alloc_info+0x38/0x60 vm_insert_page+0x2e7/0x400 remap_vmalloc_range_partial+0x212/0x3e0 remap_vmalloc_range+0x6e/0xb0 ? __kasan_check_write+0x14/0x30 rxe_mmap+0x2e9/0x5d0 ib_uverbs_mmap+0x1ad/0x2c0 __mmap_region+0x12c2/0x2ad0 ? __pfx___mmap_region+0x10/0x10 ? __sanitizer_cov_trace_switch+0x58/0xb0 ? mas_prev_slot+0x360/0x39c0 ? __sanitizer_cov_trace_switch+0x58/0xb0 ? mas_next_slot+0x1e5b/0x2f40 ? __sanitizer_cov_trace_cmp8+0x18/0x30 ? unmapped_area_topdown+0x4dd/0x610 ? kfree+0x1b1/0x440 ? free_cpumask_var+0x16/0x30 ? __kasan_slab_free+0x7d/0xa0 ? __sanitizer_cov_trace_cmp8+0x18/0x30 mmap_region+0x2e6/0x3c0 do_mmap+0xa3e/0x12a0 ? __pfx_do_mmap+0x10/0x10 ? __kasan_check_write+0x14/0x30 ? down_write_killable+0xba/0x160 ? __pfx_down_write_killable+0x10/0x10 ? __sanitizer_cov_trace_cmp4+0x16/0x30 vm_mmap_pgoff+0x2d4/0x4a0 ? __pfx_vm_mmap_pgoff+0x10/0x10 ? fget+0x1bf/0x270 ksys_mmap_pgoff+0x40c/0x690 ? __sanitizer_cov_trace_const_cmp4+0x16/0x30 ? __pfx_ksys_mmap_pgoff+0x10/0x10 ? __kasan_check_write+0x14/0x30 ? _raw_spin_trylock+0xbb/0x130 ? __pfx__raw_spin_trylock+0x10/0x10 __x64_sys_mmap+0x135/0x1e0 x64_sys_c ---truncated---
Priority
MEDIUM
Exploitation
NONE
PoC
YES
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-08-05 | 2 | Patch2 |
| 2026-08-07 | 1 | PoC1 |
| 2026-08-14 | 3 | PoC3 |
| 2026-08-17 | 1 | PoC1 |
From kref_get to root: exploitation of CVE-2026-64582: https://nasm.re/posts/cve-2026-64582/. LPE on Linux 7.2-rc1 by abusing a tight race condition in the Soft-RoCE (rxe) driver.
Post summary
The post announces the discovery of CVE‑2026‑64582, a local privilege escalation in Linux’s Soft‑RoCE driver, and provides a link to a PoC demonstrating the race‑condition exploit.
A Linux kernel RDMA/rxe use-after-free (CVE-2026-64582) enables local privilege escalation. Full details and PoC exploit code are now public. #CVE202664582 #LinuxKernel #PrivilegeEscalation #RDMA #UseAfterFree #InfoSec https://securityonline.info/cve-2026-64582-rdma-rxe-kernel-lpe-poc/
Post summary
The post discloses CVE-2026-64582, detailing a local privilege escalation via a use‑after‑free in the Linux kernel's RDMA/rxe component, and confirms that PoC exploit code has been publicly released.
Linuxカーネルのローカル権限昇格脆弱性CVE-2026-64582に対応するPoC（攻撃の概念実証コード）が公表された。RDMA/rxeにおける解放後メモリ使用。 https://securityonline.info/cve-2026-64582-rdma-rxe-kernel-lpe-poc/
Post summary
A proof‑of‑concept for CVE‑2026‑64582, a Linux kernel local privilege escalation via a use‑after‑free in RDMA/rxe, has been released, but no patches or active exploitation reports are mentioned.
CVE-2026-64582 In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix a use-after-free problem in rxe_mmap rxe_mmap() removes a rxe_mmap_info struct fro… https://www.cve.org/CVERecord?id=CVE-2026-64582
Post summary
CVE‑2026‑64582 is a use‑after‑free vulnerability in the Linux kernel RDMA/rxe subsystem that has been fixed; no exploitation or PoC is reported.
CVE-2026-64582: カーネルLPEに対するPoCエクスプロイトが公開されました CVE-2026-64582: PoC Exploit Published for Kernel LPE #DailyCyberSecurity (Aug 14) https://securityonline.info/cve-2026-64582-rdma-rxe-kernel-lpe-poc/
Post summary
A Proof of Concept exploit for CVE‑2026‑64582, a kernel local privilege escalation vulnerability, has been published and linked, but no active exploitation reports or patch information are provided.
CVE-2026-64582: PoC Exploit Published for Kernel LPE - https://securityonline.info/cve-2026-64582-rdma-rxe-kernel-lpe-poc/
Post summary
CVE-2026-64582 is a kernel local privilege escalation vulnerability for which a PoC exploit has been published and linked; no evidence of active exploitation, patches, or false‑positive claims is provided.
🚨*CVE* CVE-2026-64582 In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix a use-after-free problem in rxe_mmap rxe_mmap() removes a rxe_mmap_info struct fro… https://www.cve.org/CVERecord?id=CVE-2026-64582 ----- Traducción: CVE-2026-64582 En … http://infoflow.cloud`
Post summary
CVE-2026-64582, a use‑after‑free in Linux kernel RDMA/rxe, has been fixed; patch details are referenced via the CVE record.