CVE-2024-50273: btrfs: reinitialize delayed ref list after deleting it from the list
First published: Tue Nov 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: btrfs: reinitialize delayed ref list after deleting it from the list At insert_delayed_ref() if we need to update the action of an existing ref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's ref_add_list using list_del(), which leaves the ref's add_list member not reinitialized, as list_del() sets the next and prev members of the list to LIST_POISON1 and LIST_POISON2, respectively. If later we end up calling drop_delayed_ref() against the ref, which can happen during merging or when destroying delayed refs due to a transaction abort, we can trigger a crash since at drop_delayed_ref() we call list_empty() against the ref's add_list, which returns false since the list was not reinitialized after the list_del() and as a consequence we call list_del() again at drop_delayed_ref(). This results in an invalid list access since the next and prev members are set to poison pointers, resulting in a splat if CONFIG_LIST_HARDENED and CONFIG_DEBUG_LIST are set or invalid poison pointer dereferences otherwise. So fix this by deleting from the list with list_del_init() instead.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.10<4.19.324 | |
| Linux Kernel | >=4.20<5.4.286 | |
| Linux Kernel | >=5.5<5.10.230 | |
| Linux Kernel | >=5.11<5.15.172 | |
| Linux Kernel | >=5.16<6.1.117 | |
| Linux Kernel | >=6.2<6.6.61 | |
| Linux Kernel | >=6.7<6.11.8 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 | |
| Linux Kernel | =6.12-rc5 | |
| Linux Kernel | =6.12-rc6 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/2fd0948a483e9cb2d669c7199bc620a21c97673d
- https://git.kernel.org/stable/c/93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb
- https://git.kernel.org/stable/c/bf0b0c6d159767c0d1c21f793950d78486690ee0
- https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851
- https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6
- https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931
- https://git.kernel.org/stable/c/50a3933760b427759afdd23156a7280a19357a92
- https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50273
- https://nvd.nist.gov/vuln/detail/CVE-2024-50273
- https://launchpad.net/bugs/cve/CVE-2024-50273
- https://security-tracker.debian.org/tracker/CVE-2024-50273
- https://ubuntu.com/security/CVE-2024-50273
- https://git.kernel.org/linus/c9a75ec45f1111ef530ab186c2a7684d0a0c9245
Frequently Asked Questions
What is the severity of CVE-2024-50273?
The severity level of CVE-2024-50273 has not been explicitly stated but is related to a vulnerability in the Linux kernel that could impact system stability.
How do I fix CVE-2024-50273?
To fix CVE-2024-50273, it is recommended to upgrade the Linux kernel to a patched version that addresses this vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-50273?
CVE-2024-50273 affects multiple versions of the Linux kernel including those from 4.10 up to 6.12-rc6.
What is the nature of CVE-2024-50273?
CVE-2024-50273 is a vulnerability concerning the improper handling of delayed references in the btrfs filesystem of the Linux kernel.
Is there a public reference for CVE-2024-50273?
Yes, public references for CVE-2024-50273 can be found in the Linux kernel's commit history.
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