CVE-2024-48881

bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again

State: Published
Severity: 5.5 Medium
Published: Jan 11, 2025
Updated: Oct 15, 2026
Reserved: Jan 9, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

bcache: revert replacing IS_ERR_OR_NULL with IS_ERR again

Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in node allocations") leads a NULL pointer deference in cache_set_flush().

1721 if (!IS_ERR_OR_NULL(c->root)) 1722 list_add(&c->root->list, &c->btree_cache);

>From the above code in cache_set_flush(), if previous registration code fails before allocating c->root, it is possible c->root is NULL as what it is initialized. __bch_btree_node_alloc() never returns NULL but c->root is possible to be NULL at above line 1721.

This patch replaces IS_ERR() by IS_ERR_OR_NULL() to fix this.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	0729029e647234fa1a94376b6edffec5c2cd75f6 to before 4379c5828492a4c2a651c8f826a01453bd2b80b0Affected db9439cef0b5efccf8021fe89f4953e0f901e85b to before 336e30f32ae7c043fde0f6fa21586ff30bea9fe2Affected 991e9c186a8ac6ab272a86e0ddc6f9733c38b867 to before fb5fee35bdd18316a84b5f30881a24e1415e1464Affected 68118c339c6e1e16ae017bef160dbe28a27ae9c8 to before 5202391970ffbf81975251b3526b890ba027b715Affected 028ddcac477b691dd9205c92f991cc15259d033e to before cc05aa2c0117e20fa25a3c0d915f98b8f2e78667Affected 028ddcac477b691dd9205c92f991cc15259d033e to before 5e0e913624bcd24f3de414475018d3023f060ee1Affected 028ddcac477b691dd9205c92f991cc15259d033e to before b2e382ae12a63560fca35050498e19e760adf8c0Affected fe75e8a0c20127a8dc95704f1a7ad6b82c9a0ef8Affected 0cabf9e164660e8d66c4810396046383a1110a69Affected 5.4.251 to before 5.4.287Affected 5.10.188 to before 5.10.231Affected 5.15.121 to before 5.15.174Affected 6.1.39 to before 6.1.120Affected 4.19.291 to before 4.20Affected 6.4.4 to before 6.5Affected
LinuxLinux	6.5Affected before 6.5Not affected 5.4.287 through 5.4.Not affected 5.10.231 through 5.10.Not affected 5.15.174 through 5.15.Not affected 6.1.120 through 6.1.Not affected 6.6.66 through 6.6.Not affected 6.12.5 through 6.12.Not affected 6.13 and laterNot affected

Product

Versions

LinuxLinux

0729029e647234fa1a94376b6edffec5c2cd75f6 to before 4379c5828492a4c2a651c8f826a01453bd2b80b0Affected
db9439cef0b5efccf8021fe89f4953e0f901e85b to before 336e30f32ae7c043fde0f6fa21586ff30bea9fe2Affected
991e9c186a8ac6ab272a86e0ddc6f9733c38b867 to before fb5fee35bdd18316a84b5f30881a24e1415e1464Affected
68118c339c6e1e16ae017bef160dbe28a27ae9c8 to before 5202391970ffbf81975251b3526b890ba027b715Affected
028ddcac477b691dd9205c92f991cc15259d033e to before cc05aa2c0117e20fa25a3c0d915f98b8f2e78667Affected
028ddcac477b691dd9205c92f991cc15259d033e to before 5e0e913624bcd24f3de414475018d3023f060ee1Affected
028ddcac477b691dd9205c92f991cc15259d033e to before b2e382ae12a63560fca35050498e19e760adf8c0Affected
fe75e8a0c20127a8dc95704f1a7ad6b82c9a0ef8Affected
0cabf9e164660e8d66c4810396046383a1110a69Affected
5.4.251 to before 5.4.287Affected
5.10.188 to before 5.10.231Affected
5.15.121 to before 5.15.174Affected
6.1.39 to before 6.1.120Affected
4.19.291 to before 4.20Affected
6.4.4 to before 6.5Affected

LinuxLinux

6.5Affected
before 6.5Not affected
5.4.287 through 5.4.*Not affected
5.10.231 through 5.10.*Not affected
5.15.174 through 5.15.*Not affected
6.1.120 through 6.1.*Not affected
6.6.66 through 6.6.*Not affected
6.12.5 through 6.12.*Not affected
6.13 and laterNot affected

References

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