Answer in brief
CVE-2024-56631 records a High severity (CVSS 7.8) vulnerability in scsi: sg: Fix slab-use-after-free read in sg_release(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <e19acb1926c4a1f30ee1ec84d8afba2d975bd534 || >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <285ce1f89f8d414e7eecab5ef5118cd512596318 || >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <198b89dd5a595ee3f96e5ce5c448b0484cd0e53c || >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <275b8347e21ab8193e93223a8394a806e4ba8918 || >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <59b30afa578637169e2819536bb66459fdddc39d || >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <1f5e2f1ca5875728fcf62bc1a054707444ab4960 || >=cc833acbee9db5ca8c6162b015b4c93863c6f821 <f10593ad9bc36921f623361c9e3dd96bd52d85ee || 3a27c0defb0315760100f8b1adc7c4acbe04c884 || >=3.16.85 <3.17 | e19acb1926c4a1f30ee1ec84d8afba2d975bd534, 285ce1f89f8d414e7eecab5ef5118cd512596318, 198b89dd5a595ee3f96e5ce5c448b0484cd0e53c, 275b8347e21ab8193e93223a8394a806e4ba8918, 59b30afa578637169e2819536bb66459fdddc39d, 1f5e2f1ca5875728fcf62bc1a054707444ab4960, f10593ad9bc36921f623361c9e3dd96bd52d85ee, 3.17 |
| Linux/Linuxgeneric | 3.17 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
Dec 27, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: scsi: sg: Fix slab-use-after-free read in sg_release() Fix a use-after-free bug in sg_release(), detected by syzbot with KASAN: BUG: KASAN: slab-use-after-free in lock_release+0x151/0xa30 kernel/locking/lockdep.c:5838 __mutex_unlock_slowpath+0xe2/0x750 kernel/locking/mutex.c:912 sg_release+0x1f4/0x2e0 drivers/scsi/sg.c:407 In sg_release(), the function kref_put(&sfp->f_ref, sg_remove_sfp) is called before releasing the open_rel_lock mutex. The kref_put() call may decrement the reference count of sfp to zero, triggering its cleanup through sg_remove_sfp(). This cleanup includes scheduling deferred work via sg_remove_sfp_usercontext(), which ultimately frees sfp. After kref_put(), sg_release() continues to unlock open_rel_lock and may reference sfp or sdp. If sfp has already been freed, this results in a slab-use-after-free error. Move the kref_put(&sfp->f_ref, sg_remove_sfp) call after unlocking the open_rel_lock mutex. This ensures: - No references to sfp or sdp occur after the reference count is decremented. - Cleanup functions such as sg_remove_sfp() and sg_remove_sfp_usercontext() can safely execute without impacting the mutex handling in sg_release(). The fix has been tested and validated by syzbot. This patch closes the bug reported at the following syzkaller link and ensures proper sequencing of resource cleanup and mutex operations, eliminating the risk of use-after-free errors in sg_release().
Quoted source text, attributed separately from HOL analysis.