In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Fix OOB in freerdatomic_resources()

freerdatomicresources() iterates using qp->attr.maxdestrdatomic. Updating maxdestrd_atomic before freeing the old array can make the free path walk past the old allocation and trigger a slab out-of-bounds

write catched by KASAN:

BUG: KASAN: slab-out-of-bounds in freerdatomicresource drivers/infiniband/sw/rxe/rxeqp.c:180 [inline] BUG: KASAN: slab-out-of-bounds in freerdatomicresources drivers/infiniband/sw/rxe/rxeqp.c:171 [inline] BUG: KASAN: slab-out-of-bounds in freerdatomicresources drivers/infiniband/sw/rxe/rxeqp.c:163 [inline] BUG: KASAN: slab-out-of-bounds in rxeqpfromattr+0x1e88/0x2150 drivers/infiniband/sw/rxe/rxeqp.c:712 Write of size 4 at addr ffff88802b8dddb8 by task syz.3.451/11063

CPU: 0 UID: 0 PID: 11063 Comm: syz.3.451 Not tainted 7.1.0 #2 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: <TASK> __dumpstack lib/dumpstack.c:94 [inline] dumpstacklvl+0x10e/0x1f0 lib/dumpstack.c:120 printaddressdescription mm/kasan/report.c:378 [inline] printreport+0xf7/0x600 mm/kasan/report.c:482 kasanreport+0xe4/0x120 mm/kasan/report.c:595 freerdatomicresource drivers/infiniband/sw/rxe/rxeqp.c:180 [inline] freerdatomicresources drivers/infiniband/sw/rxe/rxeqp.c:171 [inline] freerdatomicresources drivers/infiniband/sw/rxe/rxeqp.c:163 [inline] rxeqpfromattr+0x1e88/0x2150 drivers/infiniband/sw/rxe/rxeqp.c:712 rxemodifyqp+0x1e2/0x530 drivers/infiniband/sw/rxe/rxeverbs.c:623 ibsecuritymodifyqp+0x223/0xfa0 drivers/infiniband/core/security.c:625 ibmodifyqp+0x333/0xec0 drivers/infiniband/core/verbs.c:1915 modifyqp+0x13ca/0x1940 drivers/infiniband/core/uverbscmd.c:1932 ibuverbsmodifyqp+0xcb/0x120 drivers/infiniband/core/uverbscmd.c:1958 ibuverbswrite+0xb86/0x1030 drivers/infiniband/core/uverbsmain.c:680 vfswrite+0x2aa/0x1070 fs/readwrite.c:686 ksyswrite+0x1f8/0x250 fs/readwrite.c:740 dosyscallx64 arch/x86/entry/syscall64.c:63 [inline] dosyscall64+0x116/0x800 arch/x86/entry/syscall64.c:94 entrySYSCALL64afterhwframe+0x77/0x7f RIP: 0033:0x7fefc75a70cd Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fefc8495018 EFLAGS: 00000246 ORIGRAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fefc7835fa0 RCX: 00007fefc75a70cd RDX: 0000000000000078 RSI: 0000200000000240 RDI: 0000000000000007 RBP: 00007fefc764f10f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fefc7836038 R14: 00007fefc7835fa0 R15: 00007ffcf0586aa0 </TASK>

Allocated by task 11063: kasansavestack+0x33/0x60 mm/kasan/common.c:57 kasansavetrack+0x14/0x30 mm/kasan/common.c:78 poisonkmallocredzone mm/kasan/common.c:398 [inline] __kasankmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasankmalloc include/linux/kasan.h:263 [inline] __dokmallocnode mm/slub.c:5296 [inline] _kmallocnoprof+0x32a/0x850 mm/slub.c:5308 kmallocnoprof include/linux/slab.h:954 [inline] kzallocnoprof include/linux/slab.h:1188 [inline] allocrdatomicresources drivers/infiniband/sw/rxe/rxeqp.c:155 [inline] rxeqpfromattr+0x3f8/0x2150 drivers/infiniband/sw/rxe/rxeqp.c:714 rxemodifyqp+0x1e2/0x530 drivers/infiniband/sw/rxe/rxeverbs.c:623 ibsecuritymodifyqp+0x223/0xfa0 drivers/infiniband/core/security.c:625 ibmodifyqp+0x333/0xec0 drivers/infiniband/core/verbs.c:1915 modifyqp+0x13ca/0x1940 drivers/infiniband/core/uverbscmd.c:1932 ibuverbsmodifyqp+0xcb/0x120 drivers/infiniband/core/uverbscmd.c:1958 ibuverbswrite+0xb86/0x1030 drivers/infiniband/core/uverbsma ---truncated---