CVE-2024-50273btrfs: reinitialize delayed ref list after deleting it from the list
- 7.8HighCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 78% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 29 days later
· 29 days later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CISA-ADPADP (enrichment) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.29% · top 78% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < 2fd0948a483e9cb2d669c7199bc620a21c97673d
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < 93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < bf0b0c6d159767c0d1c21f793950d78486690ee0
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < c24fa427fc0ae827b2a3a07f13738cbf82c3f851
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < 2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < f04be6d68f715c1473a8422fc0460f57b5e99931
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < 50a3933760b427759afdd23156a7280a19357a92
- affected 1d57ee941692d0cc928526e21a1557b2ae3e11db – < c9a75ec45f1111ef530ab186c2a7684d0a0c9245
- affected 4.10
- unaffected < 4.10
- unaffected 4.19.324 – ≤ 4.19.*
- unaffected 5.4.286 – ≤ 5.4.*
- unaffected 5.10.230 – ≤ 5.10.*
- unaffected 5.15.172 – ≤ 5.15.*
- unaffected 6.1.117 – ≤ 6.1.*
- unaffected 6.6.61 – ≤ 6.6.*
- unaffected 6.11.8 – ≤ 6.11.*
- unaffected 6.12 – ≤ *
References
References10
- https://git.kernel.org/stable/c/2fd0948a483e9cb2d669c7199bc620a21c97673d (opens in a new tab)
- https://git.kernel.org/stable/c/93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb (opens in a new tab)
- https://git.kernel.org/stable/c/bf0b0c6d159767c0d1c21f793950d78486690ee0 (opens in a new tab)
- https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851 (opens in a new tab)
- https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6 (opens in a new tab)
- https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931 (opens in a new tab)
- https://git.kernel.org/stable/c/50a3933760b427759afdd23156a7280a19357a92 (opens in a new tab)
- https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-44775 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-50273)Record last updated .