CyberSecBulletin
CVE-2024-41087NVD status: Modified

Linux: Double Free

Published Updated By the CyberSecBulletin desk

CVE-2024-41087 is a high-severity double free vulnerability in Linux, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 290073b2b557e4dc21ee74a1e403d9ae79e393a2, 56f1c7e290cd6c69c948fcd2e2a49e6a637ec38f, 010de9acbea58fbcbda08e3793d6262086a493fe as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.24% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 290073b2b557e4dc21ee74a1e403d9ae79e393a2 or 56f1c7e290cd6c69c948fcd2e2a49e6a637ec38f or 010de9acbea58fbcbda08e3793d6262086a493fe or 5dde5f8b790274723640d29a07c5a97d57d62047, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 4.19.317 or 5.4.279 or 5.10.221 or 5.15.162, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxdafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 290073b2b557e4dc21ee74a1e403d9ae79e393a2; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 56f1c7e290cd6c69c948fcd2e2a49e6a637ec38f; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 010de9acbea58fbcbda08e3793d6262086a493fe; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 5dde5f8b790274723640d29a07c5a97d57d62047; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 702c1edbafb2e6f9d20f6d391273b5be09d366a5; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 062e256516d7db5e7dcdef117f52025cd5c456e3; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, 8106da4d88bbaed809e023cc8014b766223d6e76; dafd6c496381c1cd1f5ba9ad953e810bdcc931bc up to, but not including, ab9e0c529eb7cafebdd31fe1644524e80a48b05d; and 1 more ranges290073b2b557e4dc21ee74a1e403d9ae79e393a2, 56f1c7e290cd6c69c948fcd2e2a49e6a637ec38f, 010de9acbea58fbcbda08e3793d6262086a493fe, 5dde5f8b790274723640d29a07c5a97d57d62047, 702c1edbafb2e6f9d20f6d391273b5be09d366a5, 062e256516d7db5e7dcdef117f52025cd5c456e3
LinuxLinux Kernel4.17 up to, but not including, 4.19.317; 4.20 up to, but not including, 5.4.279; 5.5 up to, but not including, 5.10.221; 5.11 up to, but not including, 5.15.162; 5.16 up to, but not including, 6.1.97; 6.2 up to, but not including, 6.6.37; 6.7 up to, but not including, 6.9.84.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.97, 6.6.37

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.8HighCNA
CVSS 3.17.8HighNVD

Official description

In the Linux kernel, the following vulnerability has been resolved: ata: libata-core: Fix double free on error If e.g. the ata_port_alloc() call in ata_host_alloc() fails, we will jump to the err_out label, which will call devres_release_group(). devres_release_group() will trigger a call to ata_host_release(). ata_host_release() calls kfree(host), so executing the kfree(host) in ata_host_alloc() will lead to a double free: kernel BUG at mm/slub.c:553! Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 11 PID: 599 Comm: (udev-worker) Not tainted 6.10.0-rc5 #47 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014 RIP: 0010:kfree+0x2cf/0x2f0 Code: 5d 41 5e 41 5f 5d e9 80 d6 ff ff 4d 89 f1 41 b8 01 00 00 00 48 89 d9 48 89 da RSP: 0018:ffffc90000f377f0 EFLAGS: 00010246 RAX: ffff888112b1f2c0 RBX: ffff888112b1f2c0 RCX: ffff888112b1f320 RDX: 000000000000400b RSI: ffffffffc02c9de5 RDI: ffff888112b1f2c0 RBP: ffffc90000f37830 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90000f37610 R11: 617461203a736b6e R12: ffffea00044ac780 R13: ffff888100046400 R14: ffffffffc02c9de5 R15: 0000000000000006 FS: 00007f2f1cabe980(0000) GS:ffff88813b380000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2f1c3acf75 CR3: 0000000111724000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> ? __die_body.cold+0x19/0x27 ? die+0x2e/0x50 ? do_trap+0xca/0x110 ? do_error_trap+0x6a/0x90 ? kfree+0x2cf/0x2f0 ? exc_invalid_op+0x50/0x70 ? kfree+0x2cf/0x2f0 ? asm_exc_invalid_op+0x1a/0x20 ? ata_host_alloc+0xf5/0x120 [libata] ? ata_host_alloc+0xf5/0x120 [libata] ? kfree+0x2cf/0x2f0 ata_host_alloc+0xf5/0x120 [libata] ata_host_alloc_pinfo+0x14/0xa0 [libata] ahci_init_one+0x6c9/0xd20 [ahci] Ensure that we will not call kfree(host) twice, by performing the kfree() only if the devres_open_group() call failed.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Double Free

The product calls free() twice on the same memory address.

How developers prevent this class of flaw

  • Choose a language that provides automatic memory management.
  • Ensure that each allocation is freed only once. After freeing a chunk, set the pointer to NULL to ensure the pointer cannot be freed again. In complicated error conditions, be sure that clean-up routines respect the state of allocation properly. If the language is object oriented, ensure that object destructors delete each chunk of memory only once.
  • Use a static analysis tool to find double free instances.

More Double Free vulnerabilities (CWE-415)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Double Free vulnerabilities

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