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Review reviewHigh

CVE-2022-48726

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Protect mc during concurrent multicast leaves Partially revert the commit mentioned in the Fixes line to make sure that allocation and erasing multicast struct are locked. BUG: KASAN: use-after-free in ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline] BUG: KASAN: use-after-free in ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579 Read of size 8 at addr ffff88801bb74b00 by task syz-executor.1/25529 CPU: 0 PID: 25529 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0 Har...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2024.06.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Protect mc during concurrent multicast leaves Partially revert the commit mentioned in the Fixes line to make sure that allocation and erasing multicast struct are locked. BUG: KASAN: use-after-free in ucma_cleanup_multicast drivers/infiniband/core/ucma.c:491 [inline] BUG: KASAN: use-after-free in ucma_destroy_private_ctx+0x914/0xb70 drivers/infiniband/core/ucma.c:579 Read of size 8 at addr ffff88801bb74b00 by task syz-executor.1/25529 CPU: 0 PID: 25529 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0 Har...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 95fe51096b7adf1d1e7315c49c75e2f75f162584 < 75c610212b9f1756b9384911d3a2c347eee8031c, >= 95fe51096b7adf1d1e7315c49c75e2f75f162584 < 2923948ffe0835f7114e948b35bcc42bc9b3baa1, >= 95fe51096b7adf1d1e7315c49c75e2f75f162584 < ee2477e8ccd3d978eeac0dc5a981b286d9bb7b0a, >= 95fe51096b7adf1d1e7315c49c75e2f75f162584 < 36e8169ec973359f671f9ec7213547059cae972e, >= 5.10, >= 5.10 < 5.10.99, >= 5.11 < 5.15.22, >= 5.16 < 5.16.8, 5.17
Fixed versions
5.10.99, 5.15.22, 5.16.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416