{"id":"CVE-2026-80863","title":"RDMA/rxe: Fix OOB in free_rd_atomic_resources()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix OOB in free_rd_atomic_resources()\n\nfree_rd_atomic_resources() iterates using qp->attr.max_dest_rd_atomic.\nUpdating max_dest_rd_atomic before freeing the o…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 142c8165b7974b40fa62c393653edb5c00b8b5fe","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 30b90b55201902b2b8edcdbe2315ccd4c7547002","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 9b7d66ea88ae9395e42766b94a5c717b158b940a","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < f5e6580a3a16a83c743ad5a7c16922854a0d8b71","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < bc6e943794515d2a8417b02597a27bd377468d04","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < bdf5deccfbf9f556a08d1d2ef52e9e48f969e53e","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 4e5f753e8c280278c09f68fe728abf846e2bdfc1","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < d219e7a8eed3802970c3e4d243d79c70ef0a31bf","Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < de329533792a373186d79dca1ca120f8fa0afd05","Linux 4.9"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:44:57.409Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80863","references":[{"url":"https://git.kernel.org/stable/c/142c8165b7974b40fa62c393653edb5c00b8b5fe"},{"url":"https://git.kernel.org/stable/c/30b90b55201902b2b8edcdbe2315ccd4c7547002"},{"url":"https://git.kernel.org/stable/c/9b7d66ea88ae9395e42766b94a5c717b158b940a"},{"url":"https://git.kernel.org/stable/c/f5e6580a3a16a83c743ad5a7c16922854a0d8b71"},{"url":"https://git.kernel.org/stable/c/bc6e943794515d2a8417b02597a27bd377468d04"},{"url":"https://git.kernel.org/stable/c/bdf5deccfbf9f556a08d1d2ef52e9e48f969e53e"},{"url":"https://git.kernel.org/stable/c/4e5f753e8c280278c09f68fe728abf846e2bdfc1"},{"url":"https://git.kernel.org/stable/c/d219e7a8eed3802970c3e4d243d79c70ef0a31bf"},{"url":"https://git.kernel.org/stable/c/de329533792a373186d79dca1ca120f8fa0afd05"}],"tags":["cve.org"],"epss":0.00182,"epssPercentile":0.07249,"ingestedAt":"2026-10-19T09:16:01.492Z","slug":"CVE-2026-80863","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix OOB in free_rd_atomic_resources()\n\nfree_rd_atomic_resources() iterates using qp->attr.max_dest_rd_atomic.\nUpdating max_dest_rd_atomic before freeing the old array can make the\nfree path walk past the old allocation and trigger a slab out-of-bounds\nwrite catched by KASAN:\n==================================================================\nBUG: KASAN: slab-out-of-bounds in free_rd_atomic_resource drivers/infiniband/sw/rxe/rxe_qp.c:180 [inline]\nBUG: KASAN: slab-out-of-bounds in free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:171 [inline]\nBUG: KASAN: slab-out-of-bounds in free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:163 [inline]\nBUG: KASAN: slab-out-of-bounds in rxe_qp_from_attr+0x1e88/0x2150 drivers/infiniband/sw/rxe/rxe_qp.c:712\nWrite of size 4 at addr ffff88802b8dddb8 by task syz.3.451/11063\n\nCPU: 0 UID: 0 PID: 11063 Comm: syz.3.451 Not tainted 7.1.0 #2 PREEMPT(full)\nHardware 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\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x10e/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xf7/0x600 mm/kasan/report.c:482\n kasan_report+0xe4/0x120 mm/kasan/report.c:595\n free_rd_atomic_resource drivers/infiniband/sw/rxe/rxe_qp.c:180 [inline]\n free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:171 [inline]\n free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:163 [inline]\n rxe_qp_from_attr+0x1e88/0x2150 drivers/infiniband/sw/rxe/rxe_qp.c:712\n rxe_modify_qp+0x1e2/0x530 drivers/infiniband/sw/rxe/rxe_verbs.c:623\n ib_security_modify_qp+0x223/0xfa0 drivers/infiniband/core/security.c:625\n _ib_modify_qp+0x333/0xec0 drivers/infiniband/core/verbs.c:1915\n modify_qp+0x13ca/0x1940 drivers/infiniband/core/uverbs_cmd.c:1932\n ib_uverbs_modify_qp+0xcb/0x120 drivers/infiniband/core/uverbs_cmd.c:1958\n ib_uverbs_write+0xb86/0x1030 drivers/infiniband/core/uverbs_main.c:680\n vfs_write+0x2aa/0x1070 fs/read_write.c:686\n ksys_write+0x1f8/0x250 fs/read_write.c:740\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7fefc75a70cd\nCode: 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\nRSP: 002b:00007fefc8495018 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 00007fefc7835fa0 RCX: 00007fefc75a70cd\nRDX: 0000000000000078 RSI: 0000200000000240 RDI: 0000000000000007\nRBP: 00007fefc764f10f R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007fefc7836038 R14: 00007fefc7835fa0 R15: 00007ffcf0586aa0\n </TASK>\n\nAllocated by task 11063:\n kasan_save_stack+0x33/0x60 mm/kasan/common.c:57\n kasan_save_track+0x14/0x30 mm/kasan/common.c:78\n poison_kmalloc_redzone mm/kasan/common.c:398 [inline]\n __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415\n kasan_kmalloc include/linux/kasan.h:263 [inline]\n __do_kmalloc_node mm/slub.c:5296 [inline]\n __kmalloc_noprof+0x32a/0x850 mm/slub.c:5308\n kmalloc_noprof include/linux/slab.h:954 [inline]\n kzalloc_noprof include/linux/slab.h:1188 [inline]\n alloc_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:155 [inline]\n rxe_qp_from_attr+0x3f8/0x2150 drivers/infiniband/sw/rxe/rxe_qp.c:714\n rxe_modify_qp+0x1e2/0x530 drivers/infiniband/sw/rxe/rxe_verbs.c:623\n ib_security_modify_qp+0x223/0xfa0 drivers/infiniband/core/security.c:625\n _ib_modify_qp+0x333/0xec0 drivers/infiniband/core/verbs.c:1915\n modify_qp+0x13ca/0x1940 drivers/infiniband/core/uverbs_cmd.c:1932\n ib_uverbs_modify_qp+0xcb/0x120 drivers/infiniband/core/uverbs_cmd.c:1958\n ib_uverbs_write+0xb86/0x1030 drivers/infiniband/core/uverbs_ma\n---truncated---\n\n## Affected\n\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 142c8165b7974b40fa62c393653edb5c00b8b5fe`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 30b90b55201902b2b8edcdbe2315ccd4c7547002`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 9b7d66ea88ae9395e42766b94a5c717b158b940a`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < f5e6580a3a16a83c743ad5a7c16922854a0d8b71`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < bc6e943794515d2a8417b02597a27bd377468d04`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < bdf5deccfbf9f556a08d1d2ef52e9e48f969e53e`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < 4e5f753e8c280278c09f68fe728abf846e2bdfc1`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < d219e7a8eed3802970c3e4d243d79c70ef0a31bf`\n- `Linux >= b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f < de329533792a373186d79dca1ca120f8fa0afd05`\n- `Linux 4.9`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}