CVE-2024-49982: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: aoe: fix the potential use-after-free problem in more places For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put() instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs into use-after-free. Then Nicolai Stange found more places in aoe have potential use-after-free problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe() and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push packet to tx queue. So they should also use dev_hold() to increase the refcnt of skb->dev. On the other hand, moving dev_put() to tx() causes that the refcnt of skb->dev be reduced to a negative value, because corresponding dev_hold() are not called in revalidate(), aoecmd_ata_rw(), resend(), probe(), and aoecmd_cfg_rsp(). This patch fixed this issue.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.10.214 — 5.10.227
linux	linux_kernel	5.15.153 — 5.15.168
linux	linux_kernel	6.1.83 — 6.1.113
linux	linux_kernel	6.6.23 — 6.6.55
linux	linux_kernel	6.7.11 — 6.8.2
linux	linux_kernel	6.9 — 6.10.14
linux	linux_kernel	6.11 — 6.11.3
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/07b418d50ccbbca7e5d87a3a0d41d436cefebf79 https://git.kernel.org/stable/c/6d6e54fc71ad1ab0a87047fd9c211e75d86084a3 https://git.kernel.org/stable/c/8253a60c89ec35c8f36fb2cc08cdf854c7a3eb58 https://git.kernel.org/stable/c/89d9a69ae0c667e4d9d028028e2dcc837bae626f https://git.kernel.org/stable/c/acc5103a0a8c200a52af7d732c36a8477436a3d3 https://git.kernel.org/stable/c/bc2cbf7525ac288e07d465f5a1d8cb8fb9599254 https://git.kernel.org/stable/c/f63461af2c1a86af4217910e47a5c46e3372e645

Other References

https://git.kernel.org/stable/c/12f7b89dd72b25da4eeaa22097877963cad6418e https://git.kernel.org/stable/c/a786265aecf39015418e4f930cc1c14603a01490 https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-49982? +

In the Linux kernel, the following vulnerability has been resolved: aoe: fix the potential use-after-free problem in more places For fixing CVE-2023-6270, f98364e92662 ("aoe: fix the potential use-after-free problem in aoecmd_cfg_pkts") makes tx() calling dev_put() instead of doing in aoecmd_cfg_pkts(). It avoids that the tx() runs into use-after-free. Then Nicolai Stange found more places in aoe have potential use-after-free problem with tx(). e.g. revalidate(), aoecmd_ata_rw(), resend(), probe() and aoecmd_cfg_rsp(). Those functions also use aoenet_xmit() to push packet to tx queue. So they should also use dev_hold() to increase the refcnt of skb->dev. On the other hand, moving dev_put() to tx() causes that the refcnt of skb->dev be reduced to a negative value, because corresponding dev_hold() are not called in revalidate(), aoecmd_ata_rw(), resend(), probe(), and aoecmd_cfg_rsp(). This patch fixed this issue. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-49982? +

CVE-2024-49982 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-49982? +

CVE-2024-49982 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-49982? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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