RDMA/ucma: Lock the handler in ucma_set_ib_path()
In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Lock the handler in ucma_set_ib_path() ucma_set_ib_path() calls ucma_event_handler() straight from the write() path, without the handler lock that keeps ctx->file stable while a uevent is queued. The handler re-reads ctx->file for every dereference: mutex_lock(&ctx->file->mut); /* file A */ list_add_tail(&uevent->list, &ctx->file->event_list); /* file B */ mutex_unlock(&ctx->file->mut); /* file B */ wake_up_interruptible(&ctx->file->poll_wait); /* file B */ A concurrent ucma_migrate_id() reassigns ctx->file while the SET_OPTION caller sleeps in mutex_lock(), so the list_add_tail() lands on file B's event_list while only file A's mutex is held, racing every other user of that list: BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x1aa/0x1c0 Read of size 8 at addr ffff888153c6a418 by task poc_corr/486 Call Trace: __list_add_valid_or_report+0x1aa/0x1c0 ucma_event_handler+0x1be/0xc00 ucma_set_ib_path+0x45e/0x710 ucma_set_option+0x32e/0x590 ucma_write+0x1f9/0x330 Allocated by task 505: ucma_write_cm_event+0x1a1/0x660 Freed by task 505: kfree+0x1da/0x4c0 ucma_get_event+0x5d5/0x7e0 The freed object is a ucma_event that another thread dequeued from file B's list under file B's mutex. File A's mut is left held on top of that, wedging its next writer in uninterruptible sleep. This path needs a bound and address-resolved cm_id, so it requires an RDMA device to be present. Take the handler lock a
CVE-2026-89508
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-2026-89508
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": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "3dd07b369371a2f29e1c3caf1ade85bb92b4c551",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "b2da0d488a1c72956ebb0a57015ee8ee6a2f7748",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "a7f8d26e653ee43b0b572984b8ec544d3b3b6f3c",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "71dc206f2e2a645dac78879768762451aa1799f7",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "764586f8f6180084c5a7d622120f526acc6ce0c9",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "28ac2dd416482d1c763c4af5d61af465b387fb50",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "43a7d8ae9f645dc00235cfa4bf57673c20b769f8",
"versionType": "git"
},
{
"status": "affected",
"version": "09e328e47a695b0d346598f5d6593ee598e64885",
"lessThan": "ecbe7d36dc2de07e5dfbb4a8ff5b315ab43de820",
"versionType": "git"
}
],
"programFiles": [
"drivers/infiniband/core/ucma.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.10",
"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": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/infiniband/core/ucma.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89508
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #35035 · Revision 1
- Added to Heist Feed
- Publisher date