CVE-2026-72466
xprtrdma: Fix bcall rep leak and unbounded peek
Description
In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix bcall rep leak and unbounded peek rpcrdma_is_bcall() decodes a reply's first words to decide whether the frame is a backchannel call. Two issues in that decode path let a short or malformed reply leak the receive buffer and drain the Receive queue. First, the speculative peek p = xdr_inline_decode(xdr, 0); /* five p++ reads follow */ asks xdr_inline_decode() for zero bytes, which returns xdr->p without consulting xdr->end. The five subsequent __be32 reads can then walk up to 20 bytes past the wire payload into stale regbuf contents and misclassify the reply as a backchannel call. Second, after the post-peek p = xdr_inline_decode(xdr, 3 * sizeof(*p)); if (unlikely(!p)) return true; the short-header arm returns true without calling rpcrdma_bc_receive_call(). The contract with the caller is that a true return transfers ownership of rep to the backchannel path: rpcrdma_reply_handler() if (rpcrdma_is_bcall(r_xprt, rep)) return; /* bare return, skips out_post */ ... out_post: rpcrdma_post_recvs(r_xprt, credits + ...); Because rpcrdma_bc_receive_call() never ran, no one took rep, but rpcrdma_reply_handler still bare-returns past rpcrdma_rep_put() and rpcrdma_post_recvs(). The rep, with its persistently DMA-mapped receive buffer, is orphaned on rb_all_reps and freed only at transport teardown. This completion reposts nothing, so its slot is reclaimed only when a later forward-channel reply reaches out_post and rpcrdma_post_recvs() allocates a fresh rep to backfill; absent that traffic the Receive queue drains and the peer's Sends draw RNR NAKs. Fix by consulting xdr->end after the zero-length peek so the five __be32 reads cannot run unless 20 bytes of wire payload remain. A byte-precise comparison against xdr->end is required because a non-4-aligned receive rounds the stream's word count up past the true payload. Also return false from the short-header arm so the reply falls through the normal out_norqst cleanup chain (rpcrdma_rep_put() plus rpcrdma_post_recvs()).
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:19 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Validate peek against buffer end.
- Ensure short headers are handled correctly.
- Apply the provided kernel patch.
- Update the Linux kernel.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72466.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72466 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72466
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72466 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72466 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '0cee8f9c3b14bd6dee9c4310090a7f45b89b834f', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '7afc2f8d2fd9394724df9eaf22ce7a71029a5fba', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '88b5346284a184a6b7d019912232a571d672d3e3', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '07aa506436be7634e381e1e1f6d0efa9efc81ecc', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': 'd7a2870dde3bb09d51d6b9c877642996ad6b92dd', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '118a16a18c59f7ad8084b2d13988839b669fca10', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': 'c7653d5cebc8492c77ec0415b5e9c0fb3e644bc6', 'versionType': 'git'}], 'programFiles': ['net/sunrpc/xprtrdma/rpc_rdma.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sunrpc/xprtrdma/rpc_rdma.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '0cee8f9c3b14bd6dee9c4310090a7f45b89b834f', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '7afc2f8d2fd9394724df9eaf22ce7a71029a5fba', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '88b5346284a184a6b7d019912232a571d672d3e3', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '07aa506436be7634e381e1e1f6d0efa9efc81ecc', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': 'd7a2870dde3bb09d51d6b9c877642996ad6b92dd', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '118a16a18c59f7ad8084b2d13988839b669fca10', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': 'c7653d5cebc8492c77ec0415b5e9c0fb3e644bc6', 'versionType': 'git'}], 'programFiles': ['net/sunrpc/xprtrdma/rpc_rdma.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sunrpc/xprtrdma/rpc_rdma.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '0cee8f9c3b14bd6dee9c4310090a7f45b89b834f', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '7afc2f8d2fd9394724df9eaf22ce7a71029a5fba', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '88b5346284a184a6b7d019912232a571d672d3e3', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '07aa506436be7634e381e1e1f6d0efa9efc81ecc', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': 'd7a2870dde3bb09d51d6b9c877642996ad6b92dd', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': '118a16a18c59f7ad8084b2d13988839b669fca10', 'versionType': 'git'}, {'status': 'affected', 'version': '41c8f70f5a3db7e06179186b6525fd9ee1d7d314', 'lessThan': 'c7653d5cebc8492c77ec0415b5e9c0fb3e644bc6', 'versionType': 'git'}], 'programFiles': ['net/sunrpc/xprtrdma/rpc_rdma.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.14'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.14', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.15.212', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.178', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/sunrpc/xprtrdma/rpc_rdma.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix bcall rep leak and unbounded peek rpcrdma_is_bcall() decodes a reply's first words to decide whether the frame is a backchannel call. Two issues in that decode path let a short or malformed reply leak the receive buffer and drain the Receive queue. First, the speculative peek p = xdr_inline_decode(xdr, 0); /* five p++ reads follow */ asks xdr_inline_decode() for zero bytes, which returns xdr->p without consulting xdr->end. The five subsequent __be32 reads can then walk up to 20 bytes past the wire payload into stale regbuf contents and misclassify the reply as a backchannel call. Second, after the post-peek p = xdr_inline_decode(xdr, 3 * sizeof(*p)); if (unlikely(!p)) return true; the short-header arm returns true without calling rpcrdma_bc_receive_call(). The contract with the caller is that a true return transfers ownership of rep to the backchannel path: rpcrdma_reply_handler() if (rpcrdma_is_bcall(r_xprt, rep)) return; /* bare return, skips out_post */ ... out_post: rpcrdma_post_recvs(r_xprt, credits + ...); Because rpcrdma_bc_receive_call() never ran, no one took rep, but rpcrdma_reply_handler still bare-returns past rpcrdma_rep_put() and rpcrdma_post_recvs(). The rep, with its persistently DMA-mapped receive buffer, is orphaned on rb_all_reps and freed only at transport teardown. This completion reposts nothing, so its slot is reclaimed only when a later forward-channel reply reaches out_post and rpcrdma_post_recvs() allocates a fresh rep to backfill; absent that traffic the Receive queue drains and the peer's Sends draw RNR NAKs. Fix by consulting xdr->end after the zero-length peek so the five __be32 reads cannot run unless 20 bytes of wire payload remain. A byte-precise comparison against xdr->end is required because a non-4-aligned receive rounds the stream's word count up past the true payload. Also return false from the short-header arm so the reply falls through the normal out_norqst cleanup chain (rpcrdma_rep_put() plus rpcrdma_post_recvs()). Added Reference https://git.kernel.org/stable/c/07aa506436be7634e381e1e1f6d0efa9efc81ecc Added Reference https://git.kernel.org/stable/c/0cee8f9c3b14bd6dee9c4310090a7f45b89b834f Added Reference https://git.kernel.org/stable/c/118a16a18c59f7ad8084b2d13988839b669fca10 Added Reference https://git.kernel.org/stable/c/7afc2f8d2fd9394724df9eaf22ce7a71029a5fba Added Reference https://git.kernel.org/stable/c/88b5346284a184a6b7d019912232a571d672d3e3 Added Reference https://git.kernel.org/stable/c/c7653d5cebc8492c77ec0415b5e9c0fb3e644bc6 Added Reference https://git.kernel.org/stable/c/d7a2870dde3bb09d51d6b9c877642996ad6b92dd