smack: fix incorrect task context in smack_msg_queue_msgrcv
In the Linux kernel, the following vulnerability has been resolved: smack: fix incorrect task context in smack_msg_queue_msgrcv The smack_msg_queue_msgrcv() function incorrectly checks the permissions of the 'current' task instead of the 'target' task. In the msgsnd() syscall path, if a receiver is already waiting, the pipelined_send() optimization is used to push the message directly to the receiver task: ipc/msg.c`pipelined_send(): ` smp_store_release(&msr->r_msg, msg) In this case, the 'sender' (current) task performs the check on behalf of the 'receiver' task (msr->r_tsk, passed as the 'target' parameter): ipc/msg.c`pipelined_send(): ` security_msg_queue_msgrcv(,, target := msr->r_tsk,,) However, smack_msg_queue_msgrcv() ignores the 'target' and checks 'current': smack_msg_queue_msgrcv(…) ` smk_curacc_msq(isp, MAY_READWRITE); // current task 'current' MAY satisfy smack_msg_queue_msgrcv r/w requirement, but 'target' (the receiver task) might NOT; as a result, an unauthorized receiver gets the message, violating MAC policy. Test: 1) create a sysv message queue with label “foo” 2) echo "bar foo r" >/smack/load2 3) msgrcv(,,,0,MSG_NOERROR) in "bar"-labeled task. The task is waiting for the messages ... 4) msgsnd() from a "foo"-labeled task: "bar"-labeled task gets the message. This patch fixes the issue by checking permission on the 'target' task instead of 'current'. (2008-02-04, Casey Schaufler)
CVE-2026-93191
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93191
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "4e49f997ef0c569e09b42aab6bd38c7c54ea095d",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "dbece6c2f80b0470d8d99d7a016827dce99ed6e3",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "7be4bd21c50afa83c93799b0f16cf5bfa493194e",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "ec47f4177046dfaaf1cebb15f4d2e7b543475daf",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "e35dc5a4ed6d1e536382d80c685187511ff248a1",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "c2ab27c2e11591524b1378c24ad18882a425d1fa",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe",
"versionType": "git"
},
{
"status": "affected",
"version": "e114e473771c848c3cfec05f0123e70f1cdbdc99",
"lessThan": "fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5",
"versionType": "git"
}
],
"programFiles": [
"security/smack/smack_lsm.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.25"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.25",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"security/smack/smack_lsm.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93191
Source reference:
/cveMetadata/cveId
Publisher severity
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- Event
- #37901 · Revision 1
- Added to Heist Feed
- Publisher date