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NVD / CVE Program· CNA Linux

CVE-2026-80863: RDMA/rxe: Fix OOB in free_rd_atomic_resources()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 142c8165b7974b40fa62c393653edb5c00b8b5fe, 30b90b55201902b2b8edcdbe2315ccd4c7547002, 4e5f753e8c280278c09f68fe728abf846e2bdfc1; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 142c8165b7974b40fa62c393653edb5c00b8b5fe, 30b90b55201902b2b8edcdbe2315ccd4c7547002, 4e5f753e8c280278c09f68fe728abf846e2bdfc1; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix OOB in free_rd_atomic_resources() free_rd_atomic_resources() iterates using qp->attr.max_dest_rd_atomic. Updating max_dest_rd_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 free_rd_atomic_resource drivers/infiniband/sw/rxe/rxe_qp.c:180 [inline] BUG: KASAN: slab-out-of-bounds in free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:171 [inline] BUG: KASAN: slab-out-of-bounds in free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:163 [inline] BUG: KASAN: slab-out-of-bounds in rxe_qp_from_attr+0x1e88/0x2150 drivers/infiniband/sw/rxe/rxe_qp.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> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x10e/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xf7/0x600 mm/kasan/report.c:482 kasan_report+0xe4/0x120 mm/kasan/report.c:595 free_rd_atomic_resource drivers/infiniband/sw/rxe/rxe_qp.c:180 [inline] free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:171 [inline] free_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:163 [inline] rxe_qp_from_attr+0x1e88/0x2150 drivers/infiniband/sw/rxe/rxe_qp.c:712 rxe_modify_qp+0x1e2/0x530 drivers/infiniband/sw/rxe/rxe_verbs.c:623 ib_security_modify_qp+0x223/0xfa0 drivers/infiniband/core/security.c:625 _ib_modify_qp+0x333/0xec0 drivers/infiniband/core/verbs.c:1915 modify_qp+0x13ca/0x1940 drivers/infiniband/core/uverbs_cmd.c:1932 ib_uverbs_modify_qp+0xcb/0x120 drivers/infiniband/core/uverbs_cmd.c:1958 ib_uverbs_write+0xb86/0x1030 drivers/infiniband/core/uverbs_main.c:680 vfs_write+0x2aa/0x1070 fs/read_write.c:686 ksys_write+0x1f8/0x250 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x116/0x800 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+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 ORIG_RAX: 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: kasan_save_stack+0x33/0x60 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5296 [inline] __kmalloc_noprof+0x32a/0x850 mm/slub.c:5308 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] alloc_rd_atomic_resources drivers/infiniband/sw/rxe/rxe_qp.c:155 [inline] rxe_qp_from_attr+0x3f8/0x2150 drivers/infiniband/sw/rxe/rxe_qp.c:714 rxe_modify_qp+0x1e2/0x530 drivers/infiniband/sw/rxe/rxe_verbs.c:623 ib_security_modify_qp+0x223/0xfa0 drivers/infiniband/core/security.c:625 _ib_modify_qp+0x333/0xec0 drivers/infiniband/core/verbs.c:1915 modify_qp+0x13ca/0x1940 drivers/infiniband/core/uverbs_cmd.c:1932 ib_uverbs_modify_qp+0xcb/0x120 drivers/infiniband/core/uverbs_cmd.c:1958 ib_uverbs_write+0xb86/0x1030 drivers/infiniband/core/uverbs_ma ---truncated---

—No exploit Fix available
Published
Sep 4, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.9affected
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before 142c8165b7974b40fa62c393653edb5c00b8b5feaffected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before 30b90b55201902b2b8edcdbe2315ccd4c7547002affected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before 9b7d66ea88ae9395e42766b94a5c717b158b940aaffected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before f5e6580a3a16a83c743ad5a7c16922854a0d8b71affected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before bc6e943794515d2a8417b02597a27bd377468d04affected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before bdf5deccfbf9f556a08d1d2ef52e9e48f969e53eaffected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before 4e5f753e8c280278c09f68fe728abf846e2bdfc1affected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before d219e7a8eed3802970c3e4d243d79c70ef0a31bfaffected · git
    • b6bbee0d2438a2c9c7525f5bd7047a8b2ce4f38f and later · before de329533792a373186d79dca1ca120f8fa0afd05affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.184.1.el8_104.18.0-553.184.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.184.1.rt7.525.el8_104.18.0-553.184.1.rt7.525.el8_10

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-80861Sep 4, 2026 · usb: xhci: bail out of setup if the controller is inaccessible
    0Monitor
  • ← EarlierCVE-2026-80862Sep 4, 2026 · nvme-tcp: fix usage of page_frag_cache
    0Monitor
  • Later →CVE-2026-80864Sep 4, 2026 · RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux142c8165b7974b40fa62c393653edb5c00b8b5feVendor (CNA)
Linux Linux30b90b55201902b2b8edcdbe2315ccd4c7547002Vendor (CNA)
Linux Linux4e5f753e8c280278c09f68fe728abf846e2bdfc1Vendor (CNA)
Linux Linux9b7d66ea88ae9395e42766b94a5c717b158b940aVendor (CNA)
Linux Linuxbc6e943794515d2a8417b02597a27bd377468d04Vendor (CNA)
Linux Linuxbdf5deccfbf9f556a08d1d2ef52e9e48f969e53eVendor (CNA)
Linux Linuxd219e7a8eed3802970c3e4d243d79c70ef0a31bfVendor (CNA)
Linux Linuxde329533792a373186d79dca1ca120f8fa0afd05Vendor (CNA)
Linux Linuxf5e6580a3a16a83c743ad5a7c16922854a0d8b71Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.184.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.184.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.184.1.rt7.525.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-305.211.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-305.211.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-305.211.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-abi-stablelists0:4.18.0-305.211.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-305.211.1.el8_4 · Red Hat:rhel_aus:8.4::baseosPackage registry (OSV)

+9

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records