CVE-2026-64269
published 2026-07-25CVE-2026-64269: In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg When the server…
PriorityP354critical9.1CVSS 3.1
AVNACLPRNUINSUCHINAH
EPSS
0.71%
52.4th percentile
In the Linux kernel, the following vulnerability has been resolved:
RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
When the server answers an RTRS READ, rdma_write_sg() builds the source
scatter/gather entry for the IB_WR_RDMA_WRITE that returns data to the
peer. Its length is taken directly from the wire descriptor:
plist->length = le32_to_cpu(id->rd_msg->desc[0].len);
rd_msg points into the chunk buffer that the remote peer filled via
RDMA-WRITE-WITH-IMM (rtrs_srv_rdma_done() -> process_io_req() ->
process_read()), so desc[0].len is attacker-controlled and, before this
change, was only rejected when zero. The source address is the fixed
chunk start (dma_addr[msg_id]) and the source lkey is the PD-wide
local_dma_lkey, which is not tied to the chunk's MR mapping, so the verbs
layer does not constrain the transfer length to max_chunk_size. msg_id
and off are bounded against queue_depth and max_chunk_size in
rtrs_srv_rdma_done(), but desc[0].len is a separate field that was not
checked against the chunk size.
A peer that advertises desc[0].len larger than max_chunk_size can make
the posted RDMA write read past the chunk's mapped region. The resulting
behaviour depends on the IOMMU configuration: with no IOMMU or in
passthrough mode the read may extend into memory adjacent to the chunk
and be returned to the peer, which can disclose host memory; with a
translating IOMMU the out-of-range access is expected to fault and abort
the connection. In either case the transfer exceeds what the protocol
permits and is driven by a remote peer.
Reject a descriptor length above max_chunk_size, mirroring the existing
off >= max_chunk_size bound in rtrs_srv_rdma_done(). Legitimate clients
do not exceed it: the client sets desc[0].len to its MR length, which is
capped at the negotiated max_io_size (max_chunk_size - MAX_HDR_SIZE).
Affected
54 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < a35b7a8728a53ddc80b323970689fa5985816836 | a35b7a8728a53ddc80b323970689fa5985816836 |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < 68c09762172f6224e9ddf9b0a60bacbb36e443eb | 68c09762172f6224e9ddf9b0a60bacbb36e443eb |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < 6cada540150894e81042a0ae0c796a21a9a877da | 6cada540150894e81042a0ae0c796a21a9a877da |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < 2912f3d40355dabc08fdbaaf2764d02445fe88dc | 2912f3d40355dabc08fdbaaf2764d02445fe88dc |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < 6f40246f4312fdbab5a13cc440adebf95eb2aa66 | 6f40246f4312fdbab5a13cc440adebf95eb2aa66 |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < 5a45d0aa1fa50a333ce5763ade744e2d89838667 | 5a45d0aa1fa50a333ce5763ade744e2d89838667 |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < da3e44add94b05dfde56f898421922f5cf35705f | da3e44add94b05dfde56f898421922f5cf35705f |
| linux | linux | >= 9cb837480424e78ed585376f944088246685aec3 < 963af8d97a8c6a117134a8d0db1415e0489200b1 | 963af8d97a8c6a117134a8d0db1415e0489200b1 |
| linux | linux_kernel | >= 5.16 < 6.1.178 | 6.1.178 |
| linux | linux_kernel | >= 5.8 < 5.15.212 | 5.15.212 |
| linux | linux_kernel | >= 6.13 < 6.18.39 | 6.18.39 |
| linux | linux_kernel | >= 6.19 < 7.1.4 | 7.1.4 |
| linux | linux_kernel | >= 6.2 < 6.6.145 | 6.6.145 |
| linux | linux_kernel | >= 6.7 < 6.12.96 | 6.12.96 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-7.0 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-5.15 | — | — |
| ubuntu | linux-azure-7.0 | — | — |
| ubuntu | linux-azure-fde | — | — |
| ubuntu | linux-azure-fde-5.15 | — | — |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
vendor_redhat9.1CRITICAL
vendor_ubuntu9.1CRITICAL
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so had been revoked, bypassing memory protections or escalating privileges.
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
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so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- User-space API (UAPI);
- Kernel build system;
- ARM32 architecture;
- RISC-V architecture;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- User-space API (UAPI);
- Kernel build system;
- ARM32 architecture;
- ARM64 architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Compute Acceleration Framework;
- Intel NPU Driver;
- ACPI drivers;
- Android drivers;
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- Bluetooth drivers;
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
Several security issues were disc
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CVE-2026-64504 [CRITICAL] Linux kernel vulnerabilities
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- User-space API (UAPI);
- Kernel build system;
- ARM32 architecture;
- RISC-V architecture;
- S390 architecture;
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CVE-2026-63869 [CRITICAL] Linux kernel (OEM) vulnerabilities
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- User-space API (UAPI);
- Kernel build system;
- ARM32 architecture;
- RISC-V architecture;
- S390 architec
Red Hat
kernel: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
vendor_redhat·2026-07-25·CVSS 9.1
CVE-2026-64269 [CRITICAL] CWE-125 kernel: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
kernel: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
A flaw was found in the Linux kernel's RDMA (Remote Direct Memory Access) rtrs-srv module. A remote attacker can exploit this vulnerability by sending a crafted RDMA-Write length during an RTRS READ operation that exceeds the intended buffer size. This out-of-bounds read can lead to information disclosure, allowing the attacker to read sensitive host memory. In some configurations, this could also result in a denial of service.
Package: kernel (Red Hat Enterprise Linux 10) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linu
GHSA
In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg When the server answers an RTRS READ, rdma_write_sg() builds
ghsa_unreviewed·2026-07-25
CVE-2026-64269 In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg When the server answers an RTRS READ, rdma_write_sg() builds
In the Linux kernel, the following vulnerability has been resolved:
RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
When the server answers an RTRS READ, rdma_write_sg() builds the source
scatter/gather entry for the IB_WR_RDMA_WRITE that returns data to the
peer. Its length is taken directly from the wire descriptor:
plist->length = le32_to_cpu(id->rd_msg->desc[0].len);
rd_msg points into the chunk buffer that the remote peer filled via
RDMA-WRITE-WITH-IMM (rtrs_srv_rdma_done() -> process_io_req() ->
process_read()), so desc[0].len is attacker-controlled and, before this
change, was only rejected when zero. The source address is the fixed
chunk start (dma_addr[msg_id]) and the source lkey is the PD-wide
local_dma_lkey, which is not tied to the chunk's MR mapping,
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/2912f3d40355dabc08fdbaaf2764d02445fe88dchttps://git.kernel.org/stable/c/5a45d0aa1fa50a333ce5763ade744e2d89838667https://git.kernel.org/stable/c/68c09762172f6224e9ddf9b0a60bacbb36e443ebhttps://git.kernel.org/stable/c/6cada540150894e81042a0ae0c796a21a9a877dahttps://git.kernel.org/stable/c/6f40246f4312fdbab5a13cc440adebf95eb2aa66https://git.kernel.org/stable/c/963af8d97a8c6a117134a8d0db1415e0489200b1https://git.kernel.org/stable/c/a35b7a8728a53ddc80b323970689fa5985816836https://git.kernel.org/stable/c/da3e44add94b05dfde56f898421922f5cf35705f
2026-07-25
Published