9.8
CRITICAL CVSS 3.1
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
Affected Products

The following products are affected by CVE-2026-72466 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Address buffer leak and queue drain by validating peek and handling short headers correctly.
  • Validate peek against buffer end.
  • Ensure short headers are handled correctly.
  • Apply the provided kernel patch.
  • Update the Linux kernel.
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
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.